Answer 21: Acetamide is least reactive towards nucleophilic subscription. Explan

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Answer 21: Acetamide is least reactive towards nucleophilic subscription.

Explanation: For the nucleophilic substitution leaving group must depart from the electophilic carbon. Better the leaving group easier will be the substitution. Incase of Acetamide, lone pair of the nitrogen of the amino group are conjugated with the adjacent carbonyl group, making the carbonyl carbon least electrophilic.

Answer 22: Correct answer is option "C". I.e. cyclohexenone.

Explanation: Usually the cyclic ketone shows IR absobtion ~1720. However, due to alpha beta unsaturation more SP3 character or means more single bond character will there for C-O bond. Because of this IR absorption will be at lowered frequency i.e. 1689

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() : ():2304 10,8 * 21. Which of the following compound is the least reactive toward 1-propanol in Nucleophilic Acy Substitution? (A) acetyl bromide (B) acetamide (C) acetic anhydride (D) ethyl acetate 22. Which of the following compound is expected to show intense IR absorption at 1689 cm1 OH (C) OH (E) CHJCHO

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