Question

For the following carbocations the correct order of stability is
I :${}^{\oplus} CH _{2}- COCH _{3}$
II : ${}^{\oplus} CH _{2}- OCH _{3}$
III : ${}^{\oplus} CH _{2}- CH _{3}$

• A. III < II < I
• B. II < I < III
• C. I < II < III
• D. I < III

Answer 1

Answer: (D)

Stability of carbocations depends on following factors:
Stability of carbocation $\propto+M$ or $+I$ effect
Stability of carbocation $\propto$ Hyper conjugation
Stability of carbocation $\propto \frac{1}{-I \text { effect }}$