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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18 views

How to draw 3D line structure when multiple atoms go in all directions? [closed]

How could I draw a line structure for the following molecule? All atoms are carbons and hydrogens are not shown. All bonds are single bonds. So starting from red circle, I have 2 carbons going ...
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647 views

Does motor oil get more viscous when heated & what is the meaning of the SAE motor oil code?

The motor oil in my 2004 Pontiac Vibe is 5W-30. My (incorrect) understanding of this SAE nomenclature is that 5W means "Viscosity index of 5 in the winter" (or when really cold - like $\pu{-30 ^\...
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Order of reactivity of substrates towards Wurtz reaction

In a book I refer, it is said that: Both Ionic [carbanion] mechanism as well as free radical mechanism are widely accepted for Wurtz reaction. When I read this statement, I was thinking, which of ...
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Safe coating to make a 3D printed respirator mask airtight [closed]

What is a good example of something safe that could be applied as a coating layer to the walls of a 3D printed respirator mask to make them truly airtight (seal pores and fissures) while (ideally) ...
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Resonance energy in benzene

Quoting from my textbook: Although stabilized by resonance compared with other carbocations, its resonance energy is much less than that of the starting benzene ring. Here is more context : Isn'...
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1answer
29 views

Best way to store gasoline for a generator [closed]

For my lawn power-tools, my normal regime is to store 2-galleons of 85-octane gas, purchased in the spring, and treated with Sta-Bil. This lasts me through the season. Now, however, I'm looking into ...
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45 views

Dipole moment difference between ch2f2 and ch3f [duplicate]

In CH3F and CH2F2 the net dipole moment increases from 1.82 to 1.97 while in all other halogen substituted carbon atoms the dipole moment decreases. In the case of CH3Cl and CH3F the chlorine ...
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What will be the major product of the following dehydrohalogenation?

Question:- My Attempt:- I believe the answer should be C, because even if 2-butyne is formed $\ce{NaNH2}$ should cause it to rearrange into a terminal alkyne. Hence the answer should be 1-butyne. ...
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What will be the major product of the reaction between (2R,3R)-2,3-dimethyloxirane and triphenylphosphine?

Problem My Attempt But answer is given B. Where did I go wrong?
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529 views

Why isn't cyclopropane considered unsaturated?

Looking up "cycloalkanes" on wikipedia (link), I found this: In organic chemistry, the cycloalkanes (also called naphthenes, but distinct from naphthalene) are monocyclic saturated hydrocarbons. ...
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Why is substitution of halogens to alkanes a chain reaction?

During the propagation step 2, the alkyl radical always react with the halogen molecule according to my textbook. However, isn't the alkyl radical react with the halogen radical formed in the ...
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All-Gauche Alkane: Is It Possible?

I've learned about anti and gauche conformations throughout my scholastic journey, and I have heard often that straight-chain alkanes always adopt an all-anti conformation in their lowest energy state....
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Breaking of carbon chains due to annihilation of electrons using positron beams

I and my friends were taking part in a competition(physics and chem expertise needed) and we were having a few doubts about something. I was hoping if anyone of you can help in the clarification of ...
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How to compare the acidity of this multicyclic hydrocarbon to the acidity of cyclopentadiene?

This is the question: Which one is more acidic? According to me, cyclopentadiene should have been the answer, as losing a proton would make it aromatic; whereas the first option doesn't need ...
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Is it correct to say that active carbon is an enhancer of either acid or base?

As a non chemist I tried to read to understand if active carbon acts in solutions as an acid or a base but I understood that it can act as both, depends on the material which used to make the solution....
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Propene with Hydrogen. Name the catalyst used [closed]

Which industrial process uses a similar reaction?
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When I burn isopropyl alcohol (IPA), it burns orange. But when I burn ethyl alcohol, it burns totally blue. Why is this?

I burned them in a small aluminium tray. While IPA is burning orange, it produced the smell of soot, but while ethanol is burning blue there isn't any smell. Also, ethanol made the tray really cold ...
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1answer
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Reason behind more Reactivity of Unsaturated Hydrocarbons [closed]

My textbook says that unsaturated hydrocarbons are more reactive than saturated ones. But double and triple bonds are stronger than single bonds. What is the explanation for this?
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Why do certain signals in proton NMR experience extensive splitting despite only having 1 neighbour?

I came across the compound 3-methylpentan-2-ol. Looking at its proton NMR spectra, it seems there is a lot of splitting for the signal at 4 ppm. I'm assuming that the 4 ppm represents the proton in ...
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58 views

Understanding the term 'heat of hydrogenation'

From Chemistry Libretexts: Heat of hydrogenation (symbol: $ΔH_\mathrm{hydro}$) of an alkene is the standard enthalpy of catalytic hydrogenation of an alkene. Does the heat of hydrogenation include ...
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1answer
142 views

Why do boiling points of alkanes and alcohols become closer with increased chain length

I came across this graph, which clearly shows a large difference between the boiling points of alkanes and their equivalent alcohols. However, it is clear that as chain length increases, the ...
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Are there other carbon free gasses that can be used for energy transport, apart from hydrogen? [closed]

Various gasses are currently used to transport and store energy for heating and electricity generation. Most of them contain carbon: Methane, propane, butane, carbon monoxide and natural gas. It ...
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Is there a cheap and effective way to make PdZn-Ag foam?

I am trying to design a machine that can convert carbon dioxide into methanol and/or hydrocarbons. My design requires PdZn-Ag foam (nanoparticles), which is made by depositing palladium-zinc vapor ...
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Is there any chemical that can catalyze “reverse combustion?” [closed]

I am trying to build a machine that converts carbon dioxide and water into gasoline (i.e. octane). Because the energy needs are so large, is there any catalyst chemical that can cause "reverse ...
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Definition of a Homologous Series

My textbook states that members of a homologous series have the same general formula (ex. $\ce{C_{n}H_{2n}}$ for alkenes) as they only differ from one to another by additional $\ce{CH_2}$ (methylene) ...
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Are Phenol and Alchohol both hydrocarbons? [closed]

In many books there are said that Alchohols are hydrocarbons, and some says they are not. On the other hand Phenols are said aromatic hydrocarbons. It is well known that Phenols are not Alchohol. ...
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What is the order of acidity for hydrogens in primary, secondary and tertiary alkanes, alkenes, and cycloalkanes [duplicate]

The bond dissociation energies of C-H bonds in alkanes, alkenes and aromatic compounds decrease in the following order: primary > secondary > tertiary > allylic > benzylic. The weaker the bond, the ...
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495 views

Why is the name 'propylene oxide' preferred for epoxypropane?

This is the molecule I know as epoxypropane: In my neck of the woods (example), this molecule is used as one of the standard examples of small chiral molecules. The name 'epoxypropane' makes a heck ...
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268 views

What is the most acidic neutral hydrocarbon?

This is a question I've been thinking about quite frequently. I had seen that this hydrocarbon has a low $\mathrm pK_\mathrm a$ with reference to the highlighted H-atom Loss of the central gives ...
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1answer
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How much CO2 is emitted by burning coal to produce 1 kWh of energy

I'm a little embarrassed to ask this question at this stage of the climate game but, in searching, I seem to get contradictory answers. For example, here: https://www.eia.gov/tools/faqs/faq.php?id=73&...
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1answer
50 views

What does a gasoline fuel contain [closed]

I would like to ask you a quetsion about hydrocarbons and gasoline. If you mix a octane with ethanol, what kind of bonds would you gate as in how will the atoms react. Can you in someway explain it ...
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How can a conjugated system of open hydrocarbon chains have delocalization?

If conjugated systems have delocalized electrons, and delocalization takes place when there are two possible structures how come I can only find one for conjugated systems of chained hydrocarbons like ...
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210 views

Can sulfuric acid attack a hydrocarbon/paraffin? Under what conditions? [closed]

Sulfuric acid can attack benzene and other hydrocarbons (when mixed with hydrogen peroxide). Also, chlorine gas and bromine can replace hydrogen(s) in hydrocarbons like methane, ethane, propane,butane ...
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Coupling reaction with reagent Na / Dry Ether

The following question was asked on myPAT website: I started with the solution by assuming Wurtz reaction would take place. And hence, I came with the product shown in option A. I knew that ...
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1answer
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More use of pentane(+hexane+..) when compared with methane? [closed]

Methane is one of most cleaner of vehicle fuels when compared with other hydrocarbons. It can be easily and continuously produced in form of biogas in biodigestors working on farm and animal wastes. ...
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539 views

Chain with double bond or triple bond

In this hydrocarbon there can be two main chains: one with two double bonds and one with a double and a triple bond Both main chains contain seven carbon atoms. Which will be considered correct and ...
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1answer
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Why carbon monoxide reacts with hydrogen to give different products in the presence of different catalysts

My books says how carbon monoxide will react with hydrogen to give different products with different catalysts, but how exactly do different catalysts yield different products. Do they provide ...
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Carbon-Carbon Chain stabilities [duplicate]

While learning about Carbon and its Compounds in a class 10 coaching, I suggested a structure for some isomers. It contained a connection of two consecutive carbons connected by double bonds. The ...
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25 views

How would you order alkyl groups of this compound numerically? [closed]

If akyl groups are ordered alphabetically and ethyl comes before methyl, would this compound be called 2-ethyl-3,4 dimethyl pentane? Since that would be less than 4-ethyl-2,3 dimethyl pentane, correct?...
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221 views

Role of THF in oxymercuration of alkenes

I am trying to self learn solomon's organic chemistry book, but there is no explanation over why we should use THF in oxymercuration. After a quick search I found out that THF help stabilize in ...
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1answer
233 views

Does benzene react with steam to create an alcohol?

Benzene has a molecular formula of $\ce{C6H6},$ right? Surely it has some alkene-like properties because of the double bonds, so can it undergo a hydration reaction to create alcohol?
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103 views

Which reaction is useful to prepare odd number of hydrocarbons?

Which reaction is useful to prepare odd number of hydrocarbons: Wurtz reaction Kolbe electrolysis Corey–House synthesis Oxymercuration Wurtz reaction produces even products except if we take ...
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108 views

Rate law of the reaction of propane with oxygen

In class, I have a demonstration where I light a bubble filled with propane. As I add oxygen, the bubbles combust faster and more quickly. I have already balanced out the chemical reaction like so: $$...
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1answer
108 views

How to remove wash anthracene oil/creostae oil from stainless steel tanker?

I once loaded anthracene oil/creosate Oil in my stainless steel tanker and I had to transport it to some factory. The material was inside the tanker for throughout the journey that was of around 8 ...
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Ozonolysis of 1,2,3,4,5,8‐hexahydronaphthalene

Consider 1,2,3,4,5,8‐hexahydronaphthalene: If one equivalent of ozone is added, then which double bond will undergo ozonolysis? If it attacks the more electron rich one, then unstable 10 membered ...
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400–430 degrees Celsius heated bath

I want to perform a reaction which needs the temperature to be maintained between 400–430 °C. Since it's the only practical solution, I opted for a heated bath. I'm looking for a hydrocarbon fraction/...
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Why are triple covalent carbon to carbon bonds drawn linearly in skeletal structure? [duplicate]

In the link see that cyclic C-C structure with a triple covalent bond is drawn with an angle, probably the only way to draw it but why is it drawn linearly in non-cyclic and not like single or double ...
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1answer
1k views

Naming ester as a substituent to carboxylic acid

Can carboxylic acid functional group -COOH and ester's functional group R-COO-R' be in one structure? If yes, carboxylic acid will be the parent chain and ester will be the substituent as c.a. is ...
8
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1answer
305 views

Based on their respective number of degrees of freedom, what's the most efficient fuel; hydrogen or gasoline?

The reaction of octane's combustion is: $$\ce{2 C8H18 + 25 O2 -> 18 H2O + 16 CO2}$$ I am asked for computing the number of degrees of freedom of the octane given that its specific heat is $\pu{...
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81 views

Resonating structures of (pentan‐2‐ylidene)oxidanium

Draw resonating strictures of the following compound: In this molecule there are two π-components, but they are not conjugated. According to me, as there is no conjugation, it should not have a ...

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