JEE Main Chemistry question

Chemistry Aldehydes, Ketones and Carboxylic Acids JEE Main

What will be the order of reactivity of the following carbonyl compounds with Grignard's reagent? I. HCHO; II. CH₃CHO; III. (CH₃)₃CCOCH₃... (increasingly hindered dialkyl ketones)

(A)I > II > III > IVCorrect
(B)IV > III > II > I
(C)II > I > IV > III
(D)III > II > I > IV

Answer: (A)

Solution

Reactivity toward nucleophilic addition by a Grignard reagent decreases as the carbonyl carbon becomes more substituted/sterically hindered (and less electrophilic due to +I donation from alkyl

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Question ID VK-149347