question_answer

Reactivity towards nucleophilic addition reaction of (I) HCHO, (II) \[C{{H}_{3}}CHO\], (III) \[C{{H}_{3}}COC{{H}_{3}}\] is [Orissa JEE 2004]

A) II > III > I

B) III > II > I

C) I > II > III

D) I > II < III

Correct Answer: C

Solution :

           Carbonyl carbon become more reactive toward nucleophilic addition by increasing the +I effect of alkyl group so the reactivity order is as            \[\underset{\text{I}}{\mathop{HCHO}}\,>\underset{\text{II}}{\mathop{C{{H}_{3}}CHO}}\,>\underset{\text{IIII}}{\mathop{C{{H}_{3}}COC{{H}_{3}}}}\,\]