JEE PYQ: Aldehydes And Ketones Question 45
Question 45 - 2019 (12 Jan Shift 1)
Aldehydes that will NOT form Grignard product with 1 eq Grignard: (A) PhCHO, (B) HOOC-C$_6$H$_4$-CHO, (C) HO$_3$CO-C$_6$H$_4$-CHO, (D) HOCH$_2$-C$_6$H$_4$-CHO
(1). ((B), (D))
(2). ((B), (C))
(3). ((B), (C), (D))
(4). ((C), (D))
Show Answer
Answer: (3)
Solution
Grignard reacts with acidic H (OH, COOH) first via acid-base reaction, consuming the reagent without adding to CHO. B has COOH, D has CH$_2$OH, and C has ester/acid group with acidic H.
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