Blog Log in Get Started Free

NEET Practice Questions (MCQs) with Answers & Solutions

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

All Physics Chemistry Botany Zoology

● ● ● ● ●

In an S_N1 reaction on chiral centres there is

100% racemisation

inversion more than retention leading to partial racemisation

100% retention

100% inversion

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

Explanation

(b) In S_N1 reaction, there is slight more inversion product than retention product because S_N1 reaction also depends on shielding effect of the front side of the reacting carbon.

● ● ● ● ●

Following is the list of some aromatic compounds. Select the correct sequence of decreasing order of reactivity for electrophilic arpmatic substitution reaction using the answer codes given below:

a. $C_{6} H_{5} - OH$

b. $C_{6} H_{5} - {CH}_{3}$

c. $C_{6} H_{5} - {NO}_{2}$

d. $C_{6} H_{5} - CHO$

Answer codes :

a d b c

c d b a

a b d c

a b c d

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

Explanation

Dear OH is more Electronically rich ring as OH is +R group....

Then CH3 group because it Electron donating group by +I effect

Then CHO then NO2 because CHO is less Electron withdrawing group than NO2....

● ● ● ● ●

Consider the following statements:

a. Benzene gives substitution reaction more readily than addition reaction.

b. In benzyne mechanism reaction intermediate is carbanion also.

c. Tertiary alcohol always gives SNI reaction.

d. Reactivity of alcohol is very poor for SN reaction because alcohol is strongly acidic in character.

Of these statements :

only a is correct.

a and c are correct

a, b, and d are correct

a, b and c are correct

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

● ● ● ● ●

Consider the following statements :

a. ${CH}_{3}$ group is o, p-directing group due to hyperconjugation.

b. ${CCl}_{3}$ is meta directing group due to reverse hyperconjugation.

c. ${CCl}_{3}$ group is meta directing group due to mesomeric effect.

d. CHO group is m-directing group

Of these statements :

a and b are correct

a and c are correct

a, b and d are correct

c and d are correct

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

● ● ● ● ●

Which among the following compounds has minimum pH value?

butane

2-butene

1-butyne

2-butyne

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

Explanation

Among the given options, 1-butyne has the minimum pH value as the triple bond is more acidic than double and single bonds due to the greater s-character of the sp-hybridized carbon atom, making the hydrogen more acidic.

● ● ● ● ●

In the given reaction,

$C_{6} H_{5} - C \equiv C - {CH}_{3} \overset{Na / {NH}_{3} (l)}{\to} [X]$

[X] will be

1-phenylpropane

1-phenylpropene

trans-1-phenyl propene

cis-1-phenylpropene

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

● ● ● ● ●

In which compounds addition reaction will take place according to anti-Markovnikov's rule?

(i) $H_{2} C = C H - N O_{2}$

(ii) $H_{2} C = C H - C H O$

(iii) $H_{2} C = C H - C N$

(iv) $C H_{3} - C H = C H_{2}$

Select the correct answer from the codes given below:

Codes:

(i), (ii) and (iii)

(i), (ii) and (iv)

(i) and (ii)

(i) and (iii)

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

Explanation

Alkene having following structure gives anti Markovnikov addition $H_{2} C = C H - Z$ where Z is strong -I group.

● ● ● ● ●

Consider the following statements:

(i) Alkene is more reactive than alkyne for electrophilic addition reaction.

(ii) Alkyne gives nucleophilic as well as electrophilic addition reaction.

(iii) Alkyne is more reactive than alkene for nucleophilic addition reaction.

(iv) For electrophilic addition reaction, RI of alkyne is alkyl carbonation.

Of these, correct statements are:

only (i)

(i) and (ii)

(i), (ii) and (iv)

(i), (ii) and (iii)

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

Explanation

$R - C \equiv CH + \overset{\oplus}{H} \to \underset{vinylcarbocation}{R - \overset{\oplus}{C} = {CH}_{2}}$

● ● ● ● ●

Which compound is least reactive for nucleophilic addition reaction?

$C_{6} H_{5} CHO$

$C_{6} H_{5} - \overset{O}{\overset{| |}{C}} - {CH}_{3}$

$C_{6} H_{5} - \overset{O}{\overset{| |}{C}} - C_{6} H_{5}$

${CH}_{3} - \overset{O}{\overset{| |}{C}} - {CH}_{3}$

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

● ● ● ● ●

Arrange the reactivity of given carbonyl compounds in decreasing order for addition reaction:

(i) $C H_{2} B r - C H O$

(ii) $C H_{2} C l - C H O$

(iii) $C H_{2} I - C H O$

(iv) $C H_{3} - C H O$

Select the correct answer from the codes given below:

Codes:

(iv), (iii), (ii), (i)

(ii), (i), (iii), (iv)

(ii), (i), (iv), (iii)

(i), (ii), (iii), (iv)

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

Explanation

$R e a c t i v i t y α - I p o w e r o f t h e g r o u p$

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every NEET 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.