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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 [tag:aromatic-compounds] instead. For halohydrocarbons or other functional derivatives, use [tag:halides] or other relevant tags instead.

13
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1answer
326 views

ICHO Synthesis Problem 2018

I've several doubts about this ICHO synthesis problem, which was a part of the preparatory problem package of 2018 (so yes, it's not a part of an ongoing contest) Before sharing the answer given, I'...
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1answer
11 views

Analogy of hydrocarbon chain length properties [closed]

What sort of analogy is good to use for remembering how the length of hydrocarbon chains affect the properties such as melting point and volatility?
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0answers
19 views

Geometrical isomerism [closed]

compare But-2-ene with 2-Methylprop-1-ene.Can we call the second one as a cis isomer of of the former? Or simply a chain isomer of the former?As far as I know cis trans isomerism involves ...
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0answers
24 views

Determining chemical formula of the hydrocarbon via combustion analysis [closed]

A container of volume $\pu{15 L}$ contains a hydrocarbon at $\pu{27 °C}$ and $\pu{2 atm}$ pressure. For the analysis, we take $\pu{10 g}$ of hydrocarbon and the pressure becomes $\pu{1.718 atm}$ (at ...
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0answers
25 views

Doubt regarding ozonolysis

In reductive ozonolysis of alkene/alkyne, we use O3/Zn/Me2S/H2S to prevent further oxidation of resulting product. In presence of oxidising agents, like H2O or H2O2 oxidative ozonolysis takes place, ...
0
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1answer
25 views

Expanded structure formula and Lewis dot structure, whats the difference?

I am teaching my self the basics of chemistry and I have done lewis dot structure before. Right now I am going into carbon chemistry which often use structure formulas to represent compounds. There is ...
1
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1answer
49 views

Hydrogenation of 1-hexene with Raney nickel

For my high school senior chemistry project, I need to create and perform a lab. I've chosen to do the hydrogenation of 1-hexene with the catalyst of Raney nickel. I'm struggling because I'm not ...
1
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0answers
66 views

Atomic carbon in rocket exhaust

Inspired by this article, I've been looking at using metallic hydrogen as a rocket fuel using CEARUN. I'm looking at diluting the atomic hydrogen with liquid methane to reduce the chamber temperature ...
0
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1answer
42 views

Determination of molecular formula of hydrocarbons by combustion analysis

So, I've this question in my textbook: $\pu{20 mL}$ of unknown gaseous hydrocarbon reacts with excess oxygen gas. It decreases by $\pu{30 mL}$ upon cooling down. It decreases farther $\pu{40 mL}$ ...
0
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1answer
34 views

Can hydrides react with hydrocarbons? And why?

I have read there exist so called "magic" (super strong) acids which can provide a proton to saturated hydrocarbons, producing cation and hydrogen molecule. Can hydrides act in the same manner (pick a ...
0
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1answer
24 views

Why are there distortions in electron cloud in molecules? How does increase surface area amplify these distortions?

In the physical properties of hydrocarbons,it is said that branched hydrocarbons have relatively less boiling point than it's linear form. From what I have learnt is that it is due to the increase in ...
5
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1answer
85 views

Why does benzene have 3 π–π* transitions in the UV range, but ethene, butadiene, and hexatriene each have only 1?

Are the π and π* orbitals of benzene much closer together in energy which allows for multiple transitions? Why is this not the case for hexatriene if they both contain the same number of pi bonds?
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1answer
23 views

Organic reduction of alkene

Can Wolff Kishner and Clemmensen Method be used to reduce alkyne or alkene. If so do they produce syn addition or anti addition product. ?
0
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1answer
29 views

Can the inverse of a micelle be formed with non-polar solvents?

A micelle is formed due to the clustering of soap molecules wherein the interior of the cluster is formed by the hydrophobic end and the ionic ends are on the surface of the cluster. So, if a non-...
1
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0answers
50 views

Does silicon have catenation property?

We know that there are countless organic compounds of carbon chain because of carbon's catenation. Silicon also is in the same group of carbon. Does it also have the catenation property? If not, why?
1
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1answer
143 views

Why can't terminal alkynes take part in Birch reduction?

According to my book terminal alkynes are not observed in Birch reduction.Why is this so? The only property I know about them is that they are slightly acidic. Does this have something to do with it? ...
0
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0answers
24 views

Why can't a quaternary carbon product be obtained by alkane isomerization in presence of AlCl3 and HCl?

This question actually deals with the reaction in another question: Isomerisation of alkanes under Lewis acidic conditions. I have a further doubt, regarding this reaction my book says that a ...
5
votes
1answer
885 views

What is the correct name of 3-isopropyl-4-methylhexane?

In the branched alkane shown above, I've been told that 3-isopropyl-4-methylhexane is supposedly the correct name. However, in the alternative numbering scheme on the right, the parent chain is still ...
3
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1answer
199 views

What is the mechanism of alkane combustion?

I understand that combustion of hydrocarbons (such as alkanes) produces energy by breaking bonds: $$\ce{C_nH_{2n} + $\frac{3n}{2}$ O2 -> nCO2 + n H2O}$$ And I can find dozens of explanations of ...
3
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3answers
174 views

Relative strengths of methyl, primary, secondary, and tertiary C–H bonds

Which of the highlighted C–H bonds in the following compounds is weakest? (R = generic alkyl group) I personally thought that the answer was 1 but it is given as 4 in the answer key. I didn't ...
12
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1answer
198 views

Rearrangement with sodium iodide (ring opening)

I'm not able to figure out the mechanism for this reaction. I don't see how sodium iodide in acetone could lead to rearrangement, and surprisingly ring opening! What is this reaction called, if it ...
0
votes
1answer
48 views

Mechanism for formation of Quinol from a Phenolic Ether

What's the mechanism for formation of Quinol from the given phenolic substrate? The reaction seems to be an acid catalysed hydrolysis, but I'm not able to reach the final product. I guess the first ...
1
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0answers
32 views

Napthalene - Friedel Crafts Alkylation and Acylation [duplicate]

Where does Friedel Crafts Alkylation and Acylation occur in Napthalene? Are the reactions kinetic-thermodynamic controlled? Here's something I came across - While alkylation occurs at alpha ...
2
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0answers
17 views

Fluorination of Carbonyl Compounds using Molybdenum Hexafluoride

What is the mechanism of halogenation of carbonyl compounds using molybdenum hexafluoride? How does it work? Here's a reaction I came across - Can we use it for all carbonyl compounds, or, are there ...
5
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0answers
53 views

Why is bis(1,2,2,6,6-Pentamethyl-4-Piperidinyl) Sebacate used as a “bottom coat” for a superhydrophobic coating?

According to this MSDS sheet, a compound named bis(1,2,2,6,6-Pentamethyl-4-Piperidinyl) Sebacate is used in the "bottom coat" layer before a "top coat" of superhydrophobic NeverWet coating is applied. ...
4
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1answer
70 views

Does hydration show kharasch effect?

In the conversion of propene to 1-propanol, can we just use water in presence of peroxide instead of first converting it into 1-bromopropane and then reacting with $\ce{NaOH}$?
2
votes
1answer
149 views

What are the different types of catalysts used in catalytic hydrogenation of alkynes?

This is a question from Org. Chem. by Solomons, Fryhle & Snyder, adapted for JEE by M.S. Chouhan : In the first step, I expected that the reaction would stop at alkene formation via syn ...
0
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1answer
69 views

What is the softening temperature of styrofoam?

Does anybody know the softening temperature of styrofoam (expanded polystyrene)? By styrofoam I mean the solid made of expanded polystyrene balls used in packaging.
5
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0answers
157 views

Reaction of cyclopropane with hot potassium permanganate

Hot potassium permanganate is usually used as an oxidising agent, and cyclopropane being an unstable three membered ring undergoes reaction with several reagents such as bromine, $\ce{HBr}$, metal ...
3
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2answers
238 views

Rate of catalytic hydrogenation of alkenes

What does the rate of catalytic hydrogenation of alkenes depend upon? What'd be the increasing order of rate towards catalytic hydrogenation of the following alkenes, A (2-methylpropene), B (cis-but-2-...
9
votes
4answers
211 views

Is rearrangement possible in cyclic bromonium ion?

I wonder what the product of the above reaction is, that is, bromination of the given alkene in non polar solvent carbon tetrachloride (proceeds through cyclic bromonium ion intermediate). Once the ...
4
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0answers
118 views

Reaction of alpha hydroxyketone with KOH

What happens when 2-hydroxycyclohexan-1-one (an alpha hydroxyketone) reacts with aqueous $\ce{KOH}$? I tried something like Favorskii rearrangement, but it's wrong because OH isn't a good enough ...
8
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1answer
120 views

Does chlorine trifluoride react with candlewax?

I've run across references to chlorine trifluoride quite a lot. It pops up fairly regularly on the Worldbuilding SE, and whatever idea people have with it is usually shot down very quickly - For ...
4
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2answers
328 views

Nomenclature for two cyclohexane rings linked by a single bond

From my current basic organic chemistry knowledge, I suppose it is 1,1-dimethylcyclohexane-4-methylhexane. I considered one of the hexane ring as parent chain. But I'm looking for the correct answer ...
4
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1answer
43 views

Choosing Parent Chain, Complexity of Side Chains

Which parent chain should we choose for this structure? is it A or B? I followed the rule A-2.6, but it still got me confused. Both alternative A and B has the same number of side chains (2 side ...
3
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1answer
59 views

Is Cracking of Every HydroCarbon Family possible? (Alkane ,Alkenes,Arenes)

I know Cracking is usually used to crack alkanes to get smaller hydrocarbons (as they are easier to ignite) and alkenes(as they have more industrial uses)...but can we crack arenes and alkenes as they ...
2
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1answer
496 views

Which alkene on heating with alkaline KMnO4 solution gives acetone and CO2?

Which alkene on heating with alkaline $\ce{KMnO4}$ solution gives acetone and a gas that turns lime water milky ? 2-methyl-2-butene isobutylene 1-butene 2-butene I know that $\ce{...
7
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2answers
355 views

Determine minimum C-H bond length in ethane derivatives

Which of the following compound has minimum C-H bond length? ethane ethene 1,2-dibromoethene 1,2-dibromoethane How can we know the comparison of $\ce{C-H}$ bond length (not $\ce{C-C}$...
2
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2answers
105 views

Out of the given reagents, find the ones to be used to convert benzene to p-aminophenol

$\ce{Br2/FeBr3}$ $\ce{CH3Cl/AlCl3}$ $\ce{KMnO4}$ $\ce{HNO3/H2SO4}$ $\ce{NBS}$/hv $\ce{NaOH}$ $\ce{Sn/HCl}$ $\ce{NH4SH}$ $\ce{NaBH4}$ I'm able to get the amino group onto the ring by using 4 and 7. ...
0
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0answers
16 views

Rate of hydrogenation for alkenes [duplicate]

Which of the two alkene will react fastest with $\ce{H2}$ under catalytic condition? I know that rate is inversely proportional to the stability of alkene but here which will be more stable. ...
4
votes
1answer
55 views

Does presence of alkyl groups on alpha carbon increase yield of alkane in Kolbe's Decarboxylation?

We know that, during the synthesis of alkanes by Kolbe's Decarboxylation reaction, the reaction proceeds via a free radical $\ce{R.}$ at the anode. So, an alkyl group, say methyl, when substituted at ...
0
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1answer
70 views

Effect of halogen atom on Markovnikov's rule

I know that the Markovnikov's rule is because of the stability of carbocations. If a halogen atom (electron-withdrawing group) is directly attached to the carbon atom carrying a positive charge, would ...
2
votes
1answer
109 views

On the addition of HCl to a conjugated diene [closed]

Is this allylic chloride formed by an ionic or radical mechanism? Is it the more stable isomer?
1
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1answer
532 views

Reaction of dihalides with excess of NaNH2

Gem-dihalides react with $\ce{NaNH2}$ to give terminal alkynes. Why is a terminal alkyne prefered? For example, I had thought that 2-pentyne would be preferred over 1-pentyne as it would be more ...
6
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1answer
139 views

Hydroboration oxidation reaction on trans,trans,trans-1,5,9-cyclododecatriene with carbon monoxide

The given solution: I got this question in an entrance exam coaching test paper in India. Product P is easily covered by the mechanism of simple hydroboration-oxidation reaction, and I've understood ...
4
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0answers
76 views

Hydroboration oxidation reaction on trans,trans,trans-1,5,9-cyclododecatriene [duplicate]

The given solution: Could some one please explain the mechanism of the reaction? How it proceeds and why it proceeds that particular way? Also, what is the use of $\ce{CO}$?
8
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1answer
93 views

Is the hydrogenation of carbon dioxide to methane a solution or a problem?

The hydrogenation of $\ce{CO2}$ to $\ce{CH4}$ is thermodynamically a favored reaction at ambient to moderately high temperatures. $$\ce{CO2 + 4H2 <=> CH4 + 2H2O (g)}\qquad G^\circ_{\pu{298K}...
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1answer
1k views

Will vegetable oil and kerosene mix?

Is it possible to mix vegetable oil with kerosene? If not, what other solvents can be used to reduce the viscosity of cooking oil/vegetable oil.
0
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0answers
78 views

Reaction of pentadiene with HBr

$\ce{H2C=CH-CH=CH-CH3}$ reacts with $\ce{HBr}$ at low temperature. What would be the product? At low temperature, product would be kinetic and less stable, while the carbocation intermediate would ...
1
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2answers
1k views

Why is 2-ethylpentane is not a valid IUPAC name, but 3-ethylpentane is? [closed]

I'm currently writing all the names of alkanes having molecular formula $\ce{C7H16}$. I wish to ask why 2-ethylpentane is not a valid IUPAC name, but 3-ethylpentane is?