Ambident Nucleophiles & NGP in SN2 Reactions - NEET Chemistry Class 12
MCQ Practice Test & Solutions: Test: Ambident Nucleophiles & NGP in SN2 Reactions (20 Questions)
You can prepare effectively for NEET Chemistry Class 12 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Ambident Nucleophiles & NGP in SN2 Reactions". These 20 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.
Test Highlights:
- - Format: Multiple Choice Questions (MCQ)
- - Duration: 30 minutes
- - Number of Questions: 20
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Only One Option Correct Type
Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Cyanide anion has two atoms th at have lone pair of electrons. Either could act as nucleophile in the reaction. Yet in the vast majority of the cases, carbon acts as nucleophile and forms a bond to the substrate, why?
Detailed Solution: Question 1
Both carbon and nitrogen are capable of donating electron pair but carbon is better electron donor than nitrogen, carbon donates electron pair in most of the cases.In the following two phase reaction, catalyst works by
C6H5CH2Br + KCN 
C6H5CH2CN + KBr
C6H5CH2CN + KBrDetailed Solution: Question 2
Which of the following would react most rapidly with sodium ethoxide to produce an ether?
Detailed Solution: Question 3
In the given reaction,
X will be
Detailed Solution: Question 4
Consider the following reaction,
Q.
What can be correctly predicted regarding this reaction?
Detailed Solution: Question 5
Pick out the alkyl bromide which proceeds with retention of configuration in an SN2 reaction with CH3ONa (aq).
Detailed Solution: Question 6
For the following reaction, pick out the best term which describe its mechanism
Detailed Solution: Question 7
One or More than One Options Correct Type
Direction (Q. Nos. 9-13) 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.
Pick out the alkyl bromides which proceeds with retention of configuration in an SN2 reaction with CH3ONa(aq)
Detailed Solution: Question 8
Which of the following is/are ambident nucleophile?
Detailed Solution: Question 9
Which of the following gives the same substitution (SN2) product with C2H5Br no matter whether sodium or silver salt is used?
Detailed Solution: Question 10
Which of the following gives the different substitution product with CH3CH2Br when their sodium and silver salts are used?
Detailed Solution: Question 11
Consider the following substitution reaction,
Q.
The correct statement(s) is/are
Detailed Solution: Question 12
Comprehension Type
Direction (Q. Nos. 14-16) This section contains a paragraph, describing theory, experiments, data, etc.
Three 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).
Nucleophiles which have more than one type of donor atoms within the same donor group are known as ambident nucleophile e.g.
CN- : Both carbon and nitrogen are donor.
OCN- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.
Q.
When CH3CH2Br is treated with aqueous NaCN, CH3CH2CN is formed while CH3CH2NCis formed when AgCN is used in the similar reaction. It is due to
Three 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).
CN- : Both carbon and nitrogen are donor.
OCN- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.
Detailed Solution: Question 13
Nucleophiles which have more than one type of donor atoms within the same donor group are known as ambident nucleophile e.g.
CN- : Both carbon and nitrogen are donor.
OCN- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.
Q.
Treatment of CH3CH2Br with either NaNO2 or AgNO2 gives the same nitroethane as major product because
CN- : Both carbon and nitrogen are donor.
OCN- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.
Detailed Solution: Question 14
Nucleophiles which have more than one type of donor atoms within the same donor group are known as ambident nucleophile e.g.
CN- : Both carbon and nitrogen are donor.
OCN- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.
Q.
When iodomethane is treated with sodium isocyanate (NaNCO), CH3NCO is the major product while AgNCO gives CH3CH2OCN as major product because
CN- : Both carbon and nitrogen are donor.
OCN- : Both oxygen and nitrogen are donor etc.
In case of free anionic and ambident nucleophiles, the better donor atom donate its lone pair of electron and forms bond with a-carbon after substitution reaction, in a given period, donor ability decreases from left to right. In a group, donor ability increases from top to bottom.
Detailed Solution: Question 15
One Integer Value Correct Type
Direction (Q. Nos. 17 and 18) This section contains 2 questions. When worked out will result in an integer from 0 to 9 (both inclusive).
Q.
If meso form of the 2,4-dibromopentane is treated with excess of KCN(aq), how many SN2 products with both bromide substituted, wouid result?
Detailed Solution: Question 16
Consider the foiiowing SN2 reactions.
Q.
Only neighbouring effect increases reactivity of (II) by a factor of 5 x 104. If reaction (I) is carried out with initial concentration of C4H9Br = 0.05 M and NaOH 0.01 M and reaction (II) is carried out with initial concentration of both CH3SCH2CH2Br and NaOH = 0.1 M each, rate of reaction (II) would be 10x times greater than the rate of reaction (I) under identical experimental condition. What is the value of x?
Detailed Solution: Question 17
Matching List Type
Direction (Q. No. 19) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.
Q.
Match the Column I with Column II and mark the correct option from the codes given below.
Detailed Solution: Question 18
A hydrocarbon used as a refrigerant and aerosol propellant is prepared using Wurtz reaction with bromoethane and sodium metal in dry ether. The final product is_______.
Detailed Solution: Question 19
Neighboring group participation (NGP) in haloalkanes typically occurs via:
Detailed Solution: Question 20
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