question_answer

Consider the following compounds                                                                                                        

(i)

(ii) \[Ph-\overset{\begin{smallmatrix}  Ph \\  | \end{smallmatrix}}{\mathop{\underset{\centerdot }{\mathop{C}}\,}}\,-Ph\]

(iii)

hyperconjugation occurs in

A) I only                 

B) II only   

C) III only               

D) I and III

Correct Answer: B

Solution :

Hyperconjugation occurs through the H-atoms present on the carbon atom next to the double bond i.e. cc-hydrogen atoms. There is no a-H in the structures I and II. So, hyperconjugation occurs in structure III only i.e.