question_answer

The correct stability order for the following species is

A)  \[II>IV>I>III\]

B)  \[I>II>HI>IV\]

C)  \[II>I>IV>III\]

D)  \[I>III>II>IV\]

Correct Answer: D

Solution :

\[I>III>II>IV\] effect, hyper conjugation (6H) and \[+I\] effect (2 Me groups) effect, hyperconjugation (3H) and \[+I\] effect (1 Me group)   Hyperconjugation (5H) and \[+I\] effect  Hyperconjugation (2H) and \[+I\] effect