Give a structural formula for the carbocation intermediate that leads to the major product in the reaction of hydrogen chloride with 2−methyl−2−butene.

The carbocationic intermediate is formed in intermediate step should be most stable i.e. it should have highest number hyperconjugative hydrogen atoms.

The major product forms in this reaction is 2-chloro-2-methylbutane.

Reaction mechanism and structural formula of carbocation is shown below.

pstnonsonjoku pstnonsonjoku · Answer 2 · 2021-11-10T08:02:43+01:00

The major product formed when hydrogen chloride reacts with 2−methyl−2−butene proceeds through a tertiary carbo cation intermediate.

The reaction of hydrogen chloride with 2−methyl−2−butene is an addition reaction. According to Markovnickov rule, the negative part of the addendum is added to the carbon atom with the least number of hydrogen atoms. Hence, the negative part of the addendum will add to carbon 2.

Since this reaction proceeds via ionic mechanism, the carbocation will be carbon-2 as shown in the image attached to this answer. This is the carbon atom to which chlorine will eventually attach.

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