Questions tagged [hydrocarbons]

Hydrocarbons are compounds containing only hydrogen and carbon atoms. This tag should be applied when a saturated or an unsaturated hydrocarbon is the main focus. For aromatic hydrocarbons, use the tag [aromatic-compounds] instead. For halohydrocarbons or other functional derivatives, use [halides] or other relevant tags instead.

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Why is 1-ethylcyclohexene more stable than ethylidene cyclohexane?

Both compounds yield the same product, ethylcyclohexane, when hydrogenated. However, 1-ethylcyclohexene has lesser heat of hydrogenation than ethylidenecyclohexane, hence more stable. I want to know ...
Anu Vanguri's user avatar
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Why doesn't HBr show allylic substitution in presence of Peroxide?

HBr reacts with alkenes such as propene in the presence of Peroxide as per the Anti-Markovnikov rule. This is an addition reaction, forming 1-bromopropane as the major product. This happens due to the ...
Maddy's user avatar
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carbocation stability: any resonance delocalization > substitution?

My organic text (Karty, 3rd) seems to assert without much justification that in general any resonance de-localization trumps a greater degree of substitution for determining CarboCation stability. ...
some bits flipped's user avatar
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1 answer
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Difference in alkanes , alkenes and alkynes [closed]

Is there a way I can determine if a given hydrocarbon is an alkene, alkane or alkyne or even some other type. What are the KEY differences in them, like reactivity , ratio of elements and so on?
Krishang Rana's user avatar
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Zaytsev and Hoffmann

I was reading dehydration of alcohols under acidic conditions (using concentrated H2SO4 or H3PO4) and with heat (160 degree Celsius) to form alkenes Now consider the dehydration of butan-2-ol It will ...
Adhway's user avatar
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Ratio of amounts of different mono substituted alkanes (by halogenation)

My problem here is the I'm unable to use the information for reactivity of C-H bonds to calculate the amount of mono chlorides. If anyone can help me in the process, that would be great.
Heisenberg 's user avatar
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1 answer
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Definition of alpha-carbon [duplicate]

What is an $\alpha$-carbon, and how can I identify one? The other questions because of which my questions has been termed as duplicated is asking about alpha carbons in alkyl halide , while my ...
Intensed's user avatar
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2 answers
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What is the correct reaction mechanism for the following :

The question is : Now, this is what I have done : So I dont know how to proceed to the final product. In some book they tell we need to break the cyclopropane to get the desirable answer but how ? ...
SavageTomato's user avatar
3 votes
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What are the byproducts of ozonolysis?

I understand that ozonolysis of alkenes leads to formation of aldehydes or ketones or carboxylic acids depending on the type of work up, reductive or oxidative. But when I tried searching online I ...
Rassank's user avatar
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Products formed upon pyrolysis of alkanes

What sort of products will be formed when we subject a higher alkane (say decane) to pyrolysis by heating at 773-973 K in the presence of $\ce{H2/Ni}$? I know that lower aliphatic alkanes and alkenes ...
calcandquant's user avatar
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Why are "vinylic" and "allylic" carbons named so?

I find it hard to remember which is "vinylic" and "allylic" carbon, so I feel it would be easier to remember if I know the reason why they are named so, like their word root ...
saromitha kumar XA mem's user avatar
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What is the rate of hydration in the following compounds

I came across a question : What is the order of rate of hydration in the following compounds: My attempt to this question was checking the stability of carbocation. As III has a possibility of 3* ...
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How to clean naphtha of non-saponifiable fats

My dad has been using naphtha to degrease some animal bones, which based on the MSDS is probably some random jumble of hydrocarbons, mostly heptanes. He's trying to be environmentally friendly so he ...
ProfWalrus's user avatar
5 votes
2 answers
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Reactivity towards electrophilic addition reaction among unsaturated cyclohexane derivatives

I am a class 8th student preparing for chemistry olympiad. I am having slight confusion regarding how to decide the reactivity towards electrophilic addition reactions. What should we give more ...
Kumar Light's user avatar
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What are disadvantages of methane or ammonia compared to dihydrogen for metal ore reduction?

Metallurgy, such as steel-making processes, require reducing agents to get rid of the oxygen in metal ores. Using fossil coal for this is a large source of $\ce{CO2}$ globally. Recently, I have read a ...
tobalt's user avatar
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Predict the products of organic reaction sequence

This is a reaction sequence involving alcohols, phenols, halides, alkenes ,alkanes etc , and the task is to identify all the compounds A to E The few things I was able to identify : The compound C ...
satvik's user avatar
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Electrolysis of gasoline (or other uniform liquid hydrocarbon) [closed]

Electrolysis, when I usually search about it, is almost exclusively interested in splitting $\ce{H2O}$. However, looking at the Wikipedia article on electrolysis, it seems like it works for a bunch of ...
G. Putnam's user avatar
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Preparation of cycloalkanes [closed]

Is it possible to get cyclooctane from calcium suberate? Is this reaction similar to one when getting cyclohexane from calcium adipitate?
Marijus Klp's user avatar
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1 answer
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Is neo-octane possible and if yes, what is its structure? [closed]

I know iso-octane is an exception and is 2,2,4-Trimethylpentane which intuitively contains both iso and Neo groups. But then what is the structure of neo-octane or even is it possible?
S K's user avatar
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What would be the product if ozonolysis of an alkene is done in the presence of water?

I have gone across several articles that have mentioned the below: Alkenes on reaction with O3 and Zn/H2O or any other reducing agent gives aldehyde/ketone. Alkenes on reaction with O3 and H2O2 gives ...
RR.'s user avatar
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Chlorination of 2-phenylbutane [closed]

When the compound is chlorinated on the extreme carbons, there is a chiral carbon in both the resulting compounds, which gives a total of 4 stereo isomers. When compound is chlorinated on 2nd or 3rd ...
Manthan Kale's user avatar
1 vote
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Chemical equation of wood to charcoal pyrolysis

The equation for the perfect burning of wood is approximately: $$\ce{C_xH_yO_z + VOCs + O2 -> CO2 + H2O + volatiles + heat}$$ Where $\ce{C_xH_yO_z}$ represents the cellulose and lignin and VOCs are ...
Adrien Hingert's user avatar
-4 votes
1 answer
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Preparation of alkane through decarboxylation by soda lime

Can we still prepare alkane through decarboxylation (using soda lime) if instead of using sodium salt of carboxylic acid, we use the carboxylic acid directly. Because I have always seen the ...
Arnav Tyagi's user avatar
1 vote
1 answer
166 views

Is CD4 an alkane?

Can $\ce{CD4}$ or $\ce{CT4}$ be considered an alkane? I know that an alkane is $\ce{C_nH_p}$ where $p = 2n + 2$. An alkane is considered a "hydro"carbon, i.e., a compound containing purely ...
CHEMUMAN's user avatar
2 votes
1 answer
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Which hydrogen in 3-ethynyltoluene is the most acidic?

Arrange the three types of hydrogens in 1‐ethynyl‐3‐methylbenzene in the order from the most acidic to the least. From my understanding, the hydrogen on methyl would be the most acidic as the ...
Satya's user avatar
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unexpected ozonolysis products: short chain alkanes (methan, ethane, propane) as reaction products when ozone reacts with organic matter

My question is which molecule or functional group reacts with ozone to yield short-chain alkanes? Some background: I use ozone produced by an ozone generator with the aim to clean my vacuum instrument ...
Jochen Schmitt 's user avatar
4 votes
2 answers
732 views

Flash point of naptha and propanol

I filled a Zippo lighter with 2-propanol and it lit up easily when the ambient temperature was around 6-7 degrees Celsius. It was impossible to light it up when the temperature was around 3-4 degrees ...
flappix's user avatar
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5 votes
1 answer
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Aromaticity of [14]annulene

Our teacher had taught us that cis-trans-[10]annulene is non-aromatic. The reason he gave is due to repulsions between hydrogens, the structure is no longer planar But later he told us that [14]...
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Burning Plastic: can it be done without harmful pollution? [closed]

Can plastic be melted, incinerated or recycled without emitting harmful gases and CO2? Specifically, can this be done without releasing gases harmful to humans? This question pertains to the melting ...
Nick's user avatar
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Are hydrocarbons compounds of hydrogen and carbon, or carbon and hydrogen?

Is it the same to say "Hydrocarbons are compounds of hydrogen and carbon." as saying "Hydrocarbons are compounds of carbon and hydrogen." I got a B in my chemistry test just ...
Purpose's user avatar
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2 answers
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In combustion method for analysing molecular formula of gaseous hydrocarbon, is pressure of the gaseous mixture always constant?

I understand the we have to look at the volumes, but the fact that volume of a gas is directly proportional to the number of moles of the gas holds only at constant pressure. Also we are applying Gay-...
R.Roy's user avatar
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1 answer
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Carbocation rearrangement with ring expansion

I was solving a particular question which landed me to a position where I have to decide whether the following ring expansion would take place or not by carbocation rearrangement: If the expansion ...
Shekhar Dangi's user avatar
-4 votes
1 answer
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Reaction mechanism validity [closed]

Hey I was solving some questions i found this solution to a question I'm confused, can alpha-hydroxy acids undergo dehydration??
Awadhesh Prajapati's user avatar
6 votes
2 answers
2k views

How can a molecule with a double bond on one side have a plane of symmetry, and thus, be achiral?

Does norbornene have a plane of symmetry? Is norbornene achiral or chiral? I think norbornene is chiral since there is a double bond on the only one side. Thus, there is no plane of symmetry. The ...
songgio123's user avatar
4 votes
1 answer
562 views

Why does 2,3 dichlorobutane have 2, and not 3, stereoisomers

I understand how and that the R,S and R,R stereoisomers are different. But I don’t see why the R,R and S,S compounds are stereoisomers and not meso compounds with each other. Online it says that ...
Kirandk's user avatar
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5 votes
2 answers
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What is the flash point of acetylene?

On episode s10e11 of the show Criminal Minds, a confrontation occurs in a freezer full of acetylene gas. In this confrontation, the main character confidently fires her gun because the freezer was &...
thepenguin77's user avatar
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Retrosynthesis of (1S,2R)‐1‐isopropyl‐2,4‐dimethylcyclohexane

I think that retrosynthesis of (1S,2R)‐1‐isopropyl‐2,4‐dimethylcyclohexane involves the opening of an epoxide, to control the regiochemistry in order to achieve the trans-configuration via an SN2 ...
Charlotte's user avatar
1 vote
1 answer
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Why is active sec-pentyl group called so?

My teacher as well as Wikipedia — Pentyl group use the following names for the “pentyl” groups: Group name Structure with attachment point 1 active sec-pentyl 2 sec-pentyl 3 active pentyl If a ...
Arpit Raj Choudhary's user avatar
4 votes
1 answer
485 views

Is cyclobut‐3‐ene‐1,2‐diide aromatic?

I think cyclobut‐3‐ene‐1,2‐diide is non-aromatic since there are two sp3 carbons (carrying negative charge), but my source says it is aromatic. Why?
ThunderGlove's user avatar
1 vote
1 answer
340 views

What scientific and technical challenges prohibit the industrial use of the Sabatier reaction?

It seems that the Sabatier reaction solves the biggest problem of climate change — it does create clean gas and hydrogen fuel from the captured carbon dioxide and water (from melting ice). $$\ce{CO2 + ...
TomR's user avatar
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2 votes
2 answers
580 views

Kolbe's electrolysis reaction for alkenes' production

I came across a question in which the major product was asked for Kolbe's electrolysis of potassium salt of 2,3-dimethylbutane-1,4-dioic acid. The answer was given as trans-(but-2-ene). I couldn't ...
Aspirant's user avatar
-2 votes
1 answer
967 views

Does sodium borohydride reduces alkyne? [closed]

Will an isolated Alkyne or an alkene be reduced using sodium borohydride ($\ce{NaBH4}$)?
Mridul Kumar's user avatar
1 vote
1 answer
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How is the intermediate compound 2-chloropropan-1,3-diol is formed when hypochlorous acid is added to allyl alcohol in the preparation of glycerol?

The expected product is 3-chloropropan-1,2-diol since secondary carbocation is more stable than primary but it is not formed. I have surfed the internet a lot regarding this and none seems to be a ...
Nelly Ravenhood's user avatar
1 vote
1 answer
172 views

Can eating soap protect you if you ingested radioisotopes? [closed]

In “Pass the Vegetables, Please”, the 71st episode of Gilligan's Island, Gilligan and the gang all ate seeds of radioactive vegetables, and the professor suggested eating soap. He says the ...
Dave's user avatar
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0 answers
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Why does 1-ethylidene-2,3-dimethylcyclopropane exhibit cis-trans isomerism?

I think the carbons 2 and 3 have different configuration according to the CIP rules which makes the groups different: Am I correct? Is there any official criteria regarding these cases ?
Ali's user avatar
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Systematic IUPAC name of buckminsterfullerane

Many of you have heard of buckminsterfullerEne, which is C60, also called the "buckyball". Well, there's also buckminsterfullerAne, which is C60H60. This is a buckyball that's fully ...
000's user avatar
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-1 votes
1 answer
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What is the most stable cycloalkene? [closed]

I'm looking specifically at cyclopentene and cyclohexene. Supposedly, greater instability would lead to a more exothermic enthalpy of combustion. However, based on my data, cyclopentene is more ...
Evan's user avatar
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1 answer
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Is it possible for a long carbon chain to have both acidic and basic groups?

I was reading about a zwitter ion and I had a thought that is the same possible for an acidic and basic groups. Like a very long carbon chain with a basic group and an acidic group on either sides, I ...
Gathik Jindal's user avatar
-3 votes
2 answers
1k views

Why is methane not called carbon tetrahydride?

If aluminium hydride, $\ce{AlH3}$, is called "hydride" because it contains elemental hydrogen and sodium chloride, $\ce{NaCl}$, is called "chloride", and calcium carbide $\ce{CaC2}$...
ielnahhal's user avatar
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1 answer
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Are alkynes weakly polar?

I was reading about physical properties of alkynes in my Chemistry textbook. One of the sentence states Alkynes are weakly polar in nature. I didn't understand how alkynes are weakly polar, so I ...
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