Question

The correct stability order for the following species is

• A. II > IV > I > III
• B. I > II > III > IV
• C. II > I > IV > III
• D. I > III > II > IV

Answer 1

Answer: (D)

The correct order is $I>III>II>IV$

$+M$ effect, hyperconjugation $(6Hs)$ and $+I$ effect $(2-Me$ groups ) .

$+M$ effect, hyperconjugation $(3Hs)$ and $+I$ effect $(1-Me$ group).

Hyperconyjugation $(5Hs)$ and $+I$ effect.

Hyperconjugation $(2Hs)$ and $+I$ effect.