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)

Stability of the given species depends upon the hyperconjugation having higher number of $\alpha$-hydrogens as well as resonance. Hence the correct stability order will be
$(I)>(III)>(II)>(IV)$.