One or More than One Options Correct TypeDirection (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 SN1 reaction?a)Rate of reaction is faster in H2Othan in C2H5OHb)The reaction usually have more than one transition statesc)If -carbon is chiral, partial racemisation and net inversion takes placed)Reaction occurs at faster rate if CH3O18H is used in place of CH3OHCorrect answer is option 'A,B,C'. Can you explain this answer?

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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.

What is/are true regarding a S_N1 reaction?

a)
Rate of reaction is faster in H₂O than in C₂H₅OH
b)
The reaction usually have more than one transition states
c)
If α-carbon is chiral, partial racemisation and net inversion takes place
d)
Reaction occurs at faster rate if CH₃O¹⁸H is used in place of CH₃OH

Correct answer is option 'A,B,C'. Can you explain this answer?

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One or More than One Options Correct TypeDirection (Q. Nos. 18-22) Thi...

H₂O has higher solvating power than CH₃CH₂OH,hence faster S_N1 reaction occur in H₂O. Reaction proceeds via carbocation intermediate, it passes through more than one transition states. Due to the presence of some intimate ion pair, S_N1 reaction occur resulting in partial racemisation and net inversion of configuration.
Since, nucleophile is not involved in rate determining step, reaction occur at same rate with both CH₃— ¹⁸OH and CH₃OH.

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One or More than One Options Correct TypeDirection (Q. Nos. 18-22) Thi...

Solution:

SN1 Reaction: SN1 reaction is a substitution reaction where a nucleophile replaces a leaving group from a substrate in a two-step mechanism. In the first step, the leaving group leaves the substrate to form a carbocation intermediate and then in the second step, the nucleophile attacks the carbocation to form the final product.

Option A: Rate of reaction is faster in H2O than in C2H5OH.

This statement is true because the rate of SN1 reaction is directly proportional to the stability of the carbocation intermediate and H2O is a better nucleophile than C2H5OH. The carbocation intermediate is stabilized by the solvation of the carbocation by H2O molecules. Therefore, the rate of SN1 reaction is faster in H2O than in C2H5OH.

Option B: The reaction usually has more than one transition states.

This statement is true because the SN1 reaction involves a carbocation intermediate that can undergo different types of rearrangements or can form different isomeric products. These different rearrangements or isomeric products are possible because the carbocation intermediate can be stabilized by different atoms or functional groups that are present in the substrate.

Option C: If the -carbon is chiral, partial racemisation and net inversion takes place.

This statement is true because the SN1 reaction involves a carbocation intermediate that is formed from a substrate molecule that is chiral. The intermediate can be attacked by the nucleophile from either side, leading to the formation of a racemic mixture of the product. However, because the intermediate is more stable when the nucleophile attacks from the side opposite to the leaving group, there is a net inversion of the stereochemistry at the chiral center.

Option D: Reaction occurs at a faster rate if CH3O18H is used in place of CH3OH.

This statement is false because CH3O18H is a heavy isotope of oxygen that is less reactive than CH3OH. Therefore, the rate of SN1 reaction will be slower if CH3O18H is used instead of CH3OH.

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One or More than One Options Correct TypeDirection (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 SN1 reaction?a)Rate of reaction is faster in H2Othan in C2H5OHb)The reaction usually have more than one transition statesc)If α-carbon is chiral, partial racemisation and net inversion takes placed)Reaction occurs at faster rate if CH3O18H is used in place of CH3OHCorrect answer is option 'A,B,C'. Can you explain this answer?

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One or More than One Options Correct TypeDirection (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 SN1 reaction?a)Rate of reaction is faster in H2Othan in C2H5OHb)The reaction usually have more than one transition statesc)If α-carbon is chiral, partial racemisation and net inversion takes placed)Reaction occurs at faster rate if CH3O18H is used in place of CH3OHCorrect answer is option 'A,B,C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about One or More than One Options Correct TypeDirection (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 SN1 reaction?a)Rate of reaction is faster in H2Othan in C2H5OHb)The reaction usually have more than one transition statesc)If α-carbon is chiral, partial racemisation and net inversion takes placed)Reaction occurs at faster rate if CH3O18H is used in place of CH3OHCorrect answer is option 'A,B,C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One or More than One Options Correct TypeDirection (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 SN1 reaction?a)Rate of reaction is faster in H2Othan in C2H5OHb)The reaction usually have more than one transition statesc)If α-carbon is chiral, partial racemisation and net inversion takes placed)Reaction occurs at faster rate if CH3O18H is used in place of CH3OHCorrect answer is option 'A,B,C'. Can you explain this answer?.

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