Test: SN1 Reactions - NEET MCQ

From the following, pick out the explanation for why molecule Y hydrolyses faster than molecule Z.

Which of the following statement(s) is/are true for S_N1 reaction?

I. The rate of S_N1 reaction depends on concentration of alkyl halide
II. The rate of S_N1 reaction depends on concentration of nucleophile
III. S_N1 reactions of alkyl halides are favoured by non-polar solvents

Pick out the strongest substrate(s) for a S_N1 reaction.

Pick out the following factor(s) which promote a S_N1 reaction :

I. Temperature
II. Concentration of nucleophile
III. Concentration of alkyl halide
IV. Aprotic solvents

Which of the following alkyl halides is respectively most and least electrophilic in S_N1 reaction?

Which of the following is true regarding a S_N1 reaction?

Rank the following molecules increasing in order of relative rate of SN1 solvolysis with methanol and heat.

What is the correct order of reactivity of the followings in hydrolysis reaction at elevated temperature?

Statement I : When 3-bromo propene, which contain a labelled ¹³C at C-1 position is refluxed with methanol, following products were obtained.

Statement II : Methanol has an acidic proton bonded to oxygen.

One or More than One Options Correct Type

Direction (Q. Nos. 18-22) This section contains 5 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.

Q. 

What is/are true regarding a S_N1 reaction?

If a pure dextrorotatory enantiomer of the substrate of the following reaction is boiled with water, the correct statement(s) regarding S_N1 product(s) is/are

Which of the following can catalyse the following S_N1 reaction?

Comprehension Type

Direction (Q. Nos. 23-27) This section contains a paragraph, describing theory, experiments, data, etc.
Five questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

Passage

A chemist isolated a compound A with molecular formula C₇H₁₃Br. A undergoes very fast S_N1 reaction. Spectroscopic evidence indicated that compound A has the following structural characteristics : It contains five sp³-hybridised carbon atoms. Among those five sp³ carbon atoms, three are methyl groups, one CH₂ group and one CH group.
It also contains two sp²-hybridised carbon atoms. Also there is only one hydrogen atom attached to sp² carbons.
The compound contains a total of six aliylic hydrogen atoms.
The carbon atom that holds the Br has one H attached to it.
Working Space
When compound A reacts with boiling water, it undergoes a S_N1 reaction and produces two principal products B and C. Both B and C are alcohols with their molecular formula C₇H₁₄O. Among the two alcohols, B has the —OH group attached to a sp³ carbon atom that has no H -atoms bonded to it.

Q. 

How many stereoisomers are possible for A?

A chemist isolated a compound A with molecular formula C₇H₁₃Br. A undergoes very fast S_N1 reaction. Spectroscopic evidence indicated that compound A has the following structural characteristics : It contains five sp³-hybridised carbon atoms. Among those five sp³ carbon atoms, three are methyl groups, one CH₂ group and one CH group.
It also contains two sp²-hybridised carbon atoms. Also there is only one hydrogen atom attached to sp² carbons.
The compound contains a total of six aliylic hydrogen atoms.
The carbon atom that holds the Br has one H attached to it.
Working Space
When compound A reacts with boiling water, it undergoes a S_N1 reaction and produces two principal products B and C. Both B and C are alcohols with their molecular formula C₇H₁₄O. Among the two alcohols, B has the —OH group attached to a sp³ carbon atom that has no H -atoms bonded to it.

Q. 

What can be said about the isomerism shown by the two alcohols B and C ?

A chemist isolated a compound A with molecular formula C₇H₁₃Br. A undergoes very fast S_N1 reaction. Spectroscopic evidence indicated that compound A has the following structural characteristics : It contains five sp³-hybridised carbon atoms. Among those five sp³ carbon atoms, three are methyl groups, one CH₂ group and one CH group.
It also contains two sp²-hybridised carbon atoms. Also there is only one hydrogen atom attached to sp² carbons.
The compound contains a total of six aliylic hydrogen atoms.
The carbon atom that holds the Br has one H attached to it.
Working Space
When compound A reacts with boiling water, it undergoes a S_N1 reaction and produces two principal products B and C. Both B and C are alcohols with their molecular formula C₇H₁₄O. Among the two alcohols, B has the —OH group attached to a sp³ carbon atom that has no H -atoms bonded to it.

Q. 

If the starting compound A is brominated in gas phase in the presence of a Lewis acid catalyst, a tribromide would result from addition of Br₂ to . How many different structures of stereoisomers can be drawn for this tribromide?

A chemist isolated a compound A with molecular formula C₇H₁₃Br. A undergoes very fast S_N1 reaction. Spectroscopic evidence indicated that compound A has the following structural characteristics : It contains five sp³-hybridised carbon atoms. Among those five sp³ carbon atoms, three are methyl groups, one CH₂ group and one CH group.
It also contains two sp²-hybridised carbon atoms. Also there is only one hydrogen atom attached to sp² carbons.
The compound contains a total of six aliylic hydrogen atoms.
The carbon atom that holds the Br has one H attached to it.
Working Space
When compound A reacts with boiling water, it undergoes a S_N1 reaction and produces two principal products B and C. Both B and C are alcohols with their molecular formula C₇H₁₄O. Among the two alcohols, B has the —OH group attached to a sp³ carbon atom that has no H -atoms bonded to it.

Q. 

If the original compound A is treated with LiAIH₄ a new compound D(C₇H₁₄) would be produced. How many different structure(s) can be drawn for this D ?

A chemist isolated a compound A with molecular formula C₇H₁₃Br. A undergoes very fast S_N1 reaction. Spectroscopic evidence indicated that compound A has the following structural characteristics : It contains five sp³-hybridised carbon atoms. Among those five sp³ carbon atoms, three are methyl groups, one CH₂ group and one CH group.
It also contains two sp²-hybridised carbon atoms. Also there is only one hydrogen atom attached to sp² carbons.
The compound contains a total of six aliylic hydrogen atoms.
The carbon atom that holds the Br has one H attached to it.
Working Space
When compound A reacts with boiling water, it undergoes a S_N1 reaction and produces two principal products B and C. Both B and C are alcohols with their molecular formula C₇H₁₄O. Among the two alcohols, B has the —OH group attached to a sp³ carbon atom that has no H -atoms bonded to it.

Q. 

If the starting compound A is treated with ethanolic solution of KOH in boiling condition, a further new compound E (C₇H₁₂) is produced as major product by E2 elimination reaction. Which of the following statement will be consistent with E?