Blog Log in Get Started Free

Hydrocarbons MCQs for NEET — Chemistry Questions with Answers

Practice free Hydrocarbons (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Language English हिंदी

Chapter Difficulty Show only questions I answered incorrectly Clear Register free for difficulty & keyword filters

● ● ● ● ●

Silver acetylide when heated with HCl gives:

$C_{2} H_{2}$

$H_{2}$

$C_{2} H_{4}$

$C_{6} H_{6}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(a) Ag $C \equiv C$ Ag $\overset{HCl}{\to}$ $CH \equiv CH$

● ● ● ● ●

Alkene-1 on hydroboration followed with action of $H_{2} O_{2}$ gives:

alkanol-2

alkanol-1

alkanal

alkanone

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(b) $6 R - CH = {CH}_{2} \overset{B_{2} H_{6}}{\to}$ $2 {({RCH}_{2} {CH}_{2})}_{3} B_{2}$

$2 {({RCH}_{2} {CH}_{2})}_{3} B_{2}$ $\overset{6 H_{2} O_{2}}{\to}$ ${RCH}_{2} {CH}_{2} OH$ + $2 H_{3} {BO}_{3}$

This process always gives alkanol-1 from alkane-1.

● ● ● ● ●

Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?

${NaNH}_{2}$

HCl

$O_{2}$

${Br}_{2}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(a) ${NaNH}_{2}$ is used to distinguish between 1-butyne and 2-butyne.

${CH}_{3} {CH}_{2} C \equiv CH \overset{{NaNH}_{2}}{\to}$ ${CH}_{3} {CH}_{2} C \equiv CNa + \frac{1}{2} H_{2} ↑$

${CH}_{3} - C \equiv C - H \overset{{NaNH}_{2}}{\to}$ No reaction

● ● ● ● ●

Which reagent distinguish propyne and propene?

Alkaline ${KMnO}_{4}$

${Cu}_{2} {Cl}_{2}$ + ${NH}_{4} Cl$

${Br}_{2}$ water

${Cu}_{2} {Cl}_{2}$ + ${NH}_{4} OH$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Propyne has acidic hydrogen and it reacts with ${Cu}_{2} {Cl}_{2}$ + ${NH}_{4} OH$ to form red ppt. Propene can not react.

● ● ● ● ●

Which alkene has smallest heat of hydrogenation?

${CH}_{3} - CH = CH - {CH}_{3}$

${({CH}_{3})}_{2} C = CH - {CH}_{3}$

${CH}_{2} = CH - {CH}_{2} - {CH}_{3}$

${CH}_{3} - CH = CH - CH {({CH}_{3})}_{2}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Higher is the stability of alkene, smaller is the heat of hydrogenation.

● ● ● ● ●

The correct order of relatives rates of hydrogenation of alkenes is

Ethylene > propene > 2-butene > 2-methyl-2-butene

2-methyl-2-butene > 2-butene > Propene > Ethylene

2-butene > propene > ethylene > 2-methyl-2-butene

Propene > 2-butene > ethylene > 2-methyl-2-butene

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Higher is the stability of alkane, smaller is the heat of hydrogenation.

● ● ● ● ●

Which one of the following reaction is not possible?

CH₃COONa + HCI → CH₃COOH + NaCI

CH₃ –SO₃ H + H – C = C – Na → CH₃SONa + H – C = C – H

R – C = C – H + PhONa → PhOH + R – C = C – Na

H – C = C – H + NaH₂ → H – C = C – Na + NH₃

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

Stronger acid displaces weak acid from its salt.

● ● ● ● ●

Which of the following is a correct statement regarding the relative acidic character of cyclopropane and propane?

Cyclopropane is more acidic than propane

Propane is more acidic than cyclopropane

Both are equally acidic

Bothe are neutral

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

C – H bond strength is less in cyclopropane.

● ● ● ● ●

On halogenation, an alkane gives only one monohalogenated product. The alkane may be :

2-methyl butane

2, 2-dimethyl propane

cyclopentane

both (b) and (c)

You've reached today's free limit of 20 questions. Log in to keep practising for free.

● ● ● ● ●

Which of the following compounds can be best prepared by Wurtz-reaction ?

Iso-butane

n-butane

n-pentane

Iso-pentane

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(b) 2CH₃-CH₂-Cl $\to_{Dry ether}^{Na}$ CH₃-CH₂-CH₂-CH₃
Open chain alkane product having even number of carbons and symmetrical can be achieved by Wurtz reaction.

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Hydrocarbons question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.