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Question
Which of the following compound gives fastest aromatic nucleophilic substitution reaction ?
Which of the following compound gives fastest aromatic nucleophilic substitution reaction ?
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Solution
The correct option is B
Nucleophilic substitution reaction are favoured by strong electron withdrawing group. Electron withdrawing group at ortho and para position favours the nucleophilic substitution reaction. -I effect of Cl is more than Br. Hence, we can neglect option (c). In option (b), electron withdrawing groups are at ortho and para positions. As, the number of EWG increases at the benzene ring, the lower the temperature and pressure is required. Hence, the rate of nucleophilic substitution reaction increases. Therefore, the correct answer is option (b).
Nucleophilic substitution reaction are favoured by strong electron withdrawing group. Electron withdrawing group at ortho and para position favours the nucleophilic substitution reaction. -I effect of Cl is more than Br. Hence, we can neglect option (c). In option (b), electron withdrawing groups are at ortho and para positions. As, the number of EWG increases at the benzene ring, the lower the temperature and pressure is required. Hence, the rate of nucleophilic substitution reaction increases. Therefore, the correct answer is option (b).
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