Ncert Exercises & Solutions

Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. The major intermediate formed in the first step is -

$H_{3} C - HC = {CH}_{2} + H^{+} \to$ ?

1. $2 °$ carbanion

2. $1 °$ carbocation

3. $2 °$ carbocation

4. $1 °$ carbanion

Hint: Stability of carbocation

When electrophile attacks

{CH}_{3} - CH = {CH}_{2}

delocalisation of electrons can take place, in two possible ways

Carbocation X is

2^{o}

and carbocation Y is

1^{o}

. As

2 °

carbocation is more stable than

1 °

carbocation. Thus, option third correct.

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