Question

The correct stability order of the following species as:

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

Answer 1

The correct option is D I > III > II > IV

stability of the following species depends upon the no. of $\alpha$ -hydrogen which can undergo hyperconjugation as well as resonance. The higher the no. of alpha Hydrogen, higher will be the stability of the compound.

$\therefore$ correct order ie $I>III>II>IV$

hence option D is correct.