Exams › JEE Main › Chemistry

An 'A assertion' and a 'R reason' are given below. Choose the correct answer from the following options: A assertion (A): Vinyl halides do not undergo nucleophilic substitution easily. Reason (R): Even though the intermediate carbocation is stabilized by loosely held p-electrons, the cleavage is difficult because of strong bonding. (1) Both (A) and (R) are correct statements but (R) is not the correct explanation of (A) (2) Both (A) and (R) are correct statements and (R) is the correct explanation of (A) (3) (A) is correct statement but (R) is a wrong statement (4) Both (A) and (R) are wrong statements.

1. Both (A) and (R) are correct statements but (R) is not the correct explanation of (A)
2. Both (A) and (R) are correct statements and (R) is the correct explanation of (A)
3. (A) is correct statement but (R) is a wrong statement
4. Both (A) and (R) are wrong statements.

Correct answer: Both (A) and (R) are correct statements and (R) is the correct explanation of (A)

Solution

Vinyl halides resist nucleophilic substitution because the lone pair on halogen conjugates with the C=C, giving the C-X bond partial double-bond character (shorter, stronger). Both (A) and (R) are correct and (R) is the correct explanation of (A).

Related JEE Main Chemistry questions

• Why is the chlorine atom in vinyl chloride comparatively less reactive?
• What is the product obtained when neopentyl bromide undergoes the Wurtz reaction?
• Which of the following reactions is most likely to produce a hydrocarbon in high yield with ease?
• Which of the following reactions proceeds by an S_N2 mechanism?
• Identify the incorrect statement among the following:
• When chloroform is exposed to air and sunlight by keeping it open, what product is formed?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →