Question

Electrophilic addition reaction proceeds in two steps. The first step involves the addition of an electrophile. The type of intermediate formed in the first step of the following addition reaction is:
$H_{3}C-HC=C{H}_2+\stackrel{\oplus }{H}\to$

• A. $2^0$ Carbanion
• B. $1^0$ Carbocation
• C. $2^0$ Carbocation
• D. $1^0$ Carbanion

Answer 1

Answer: (C)

$2^0$ Carbocation

$H_{3}C-CH=C{H}_2\stackrel{H^{+}}{\to }{H}_{3}C{-}^{\oplus }CH-C{H}_3$

$2^{\circ }$ carbonation intermediate