Aryl Halides and Phenols - Result Question 30
####33. Statement I Aryl halides undergo nucleophilic substitution with ease.
Statement II The carbon halogen bond in aryl halides has partial double bond character.
(1991, 2M)
Passage Based Problems
Passage 1
Reimer-Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below.
(I)
(II)
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Answer:
Correct Answer: 33. (a)
Solution:
- Statement $I$ is incorrect, aryl halides do not usually undergo nucleophilic substitution with ease. Statement II is correct, resonance introduces partial double bond character to $C-X$ bond.
