Question

Which is the least stable carbocation?

• A. $(C{H}_3{)}_{2}H{C}^{+}$
• B. $H_3{C}^{+}$
• C. $C{H}_{3}C{H}_2^{+}$
• D. $(C{H}_3{)}_3{C}^{+}$

Answer 1

The correct option is B $H_3{C}^{+}$

$\text{Stability of carbocation}\propto \text{Number of}\alpha \text{-H}$
$H_3{C}^{+}$ is the least stable carbocation because it has no $\alpha$-H.