Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.
Reason (R): Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether. In the light of the above statements, choose the most appropriate answer from the options given below:
Assertion (A): Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis.
Reason (R): Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether. In the light of the above statements, choose the most appropriate answer from the options given below:
- (A)Both (A) and (R) are correct and (R) is the correct explanation of (A)
- (B)(A) is correct but (R) is not correct✓ Correct
- (C)Both (A) and (R) are correct but (R) is NOT the correct explanation of (A)
- (D)(A) is not correct but (R) is correct
Answer: (B)
Solution
Ethyl phenyl ether can be made by Williamson synthesis, but from sodium phenoxide and an ethyl halide, where the leaving group sits on the alkyl carbon. The stated reason fails: bromobenzene is an aryl halide whose bond gains partial double-bond character from conjugation with the ring, so it does not undergo the substitution that reaction with sodium ethoxide would demand, and no ether forms by that route. The assertion is correct but the reason is not correct.
JEE Main · 2021 · 27 Aug 2021 · Shift 1 · Single correct option