The number of chiral centres present in [B] i | vedclass

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(B) The reaction sequence is as follows:$1$. The starting material is a substituted nitrile. Reaction with $C_2H_5MgBr$ followed by hydrolysis gives a

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$4$

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(B) The reaction sequence is as follows:$1$. The starting material is a substituted nitrile. Reaction with $C_2H_5MgBr$ followed by hydrolysis gives a ketone $[A]$.$2$. The ketone $[A]$ is then reacted with $CH_3MgBr$ followed by $H_2O$ to form a tertiary alcohol $[B]$.$3$. The structure of $[B]$ is a cyclohexane ring with a methyl group at position $3$ (relative to the attachment point) and a side chain $-CH(CH_3)-C(OH)(CH_3)(C_2H_5)$ at position $1$.$4$. Let us identify the chiral centers in $[B]$:- The cyclohexane ring has two chiral centers: one at the carbon attached to the methyl group and one at the carbon attached to the side chain.- In the side chain,the carbon attached to the cyclohexane ring and the methyl group is a chiral center.- The carbon attached to the $-OH$ group,the methyl group,and the ethyl group is also a chiral center.- Thus,there are $4$ chiral centers in the final product $[B]$.

The number of chiral centres present in $[B]$ is

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