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Question
For the above reaction , the major product (A) is :
For the above reaction , the major product (A) is :
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Solution
The correct option is B
It is a dehydration reaction.
Mechanism:
Step 1- Formation of carbocation:
Here the lone pair of electrons on hydroxyl group will abstract the H+ ion and removed as water molecule leaving behind a carbocation.
Step 2- Methyl shift:
From secondary carbocation is less stable so the methyl group in adjacent carbon get shifted to give a stable tertiary carbocation.
Step 3- Ring fromation
The double bond on 6 membered ring will attact the tertiary carbocation to fom an another stable six membered ring.
Step 4- β elimination:
Now the formed cation will undergo β Elimination to give more substituted alkene which is the saytzeff product. Saytzeff product are the more stable product because it give more substituted alkenes.
It can also give Hofmann product (less substituted) which is the minor product.
Therefore the major product is (b).
It is a dehydration reaction.
Mechanism:
Step 1- Formation of carbocation:
Here the lone pair of electrons on hydroxyl group will abstract the H+ ion and removed as water molecule leaving behind a carbocation.
Step 2- Methyl shift:
From secondary carbocation is less stable so the methyl group in adjacent carbon get shifted to give a stable tertiary carbocation.
Step 3- Ring fromation
The double bond on 6 membered ring will attact the tertiary carbocation to fom an another stable six membered ring.
Step 4- β elimination:
Now the formed cation will undergo β Elimination to give more substituted alkene which is the saytzeff product. Saytzeff product are the more stable product because it give more substituted alkenes.
It can also give Hofmann product (less substituted) which is the minor product.
Therefore the major product is (b).
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