Question

Electrophilic addition reactions proceed in two steps. The
first step involves the addition of an electrophile. Name the
type of intermediate formed in the first step of the following
addition reaction. H₃C – HC = CH₂ + H⁺ → ?
(a) 2° carbanion (b) 1° carbocation
(c) 2° carbocation (d) 1° carbanion

Answer 1

c) secondary carbocation

Explanation:

From the electrophilic reactions we can find the stable carbocation.

CH3-CH=CH2+H^+-------------------- CH3-CH^+-CH ( here the nucleophilic attack is on 2 nd carbon making is secondary carbocation)

the H+ ion will attack on the double bond resulting in intermediate secondary carbocation ie CH with positive charge. The secondary carbocation is stable intermediate.

The double bond consist of 1 pie and 1 sigma bond, electrophilic reactions causes pie bond to break in 2 sigma bonds which will result in the addition of bonds in product. These bond scan be double or triple.

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