Which of the following statements is INCORREC | vedclass

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(A) Option $A$ is $INCORRECT$ because the $S_N2$ reaction mechanism involves a pentacoordinate transition state where the nucleophile attacks from the

Vedclass · Accepted Answer

Antiperiplanar transition state is involved in $S_N2$

Vedclass · Answer

(A) Option $A$ is $INCORRECT$ because the $S_N2$ reaction mechanism involves a pentacoordinate transition state where the nucleophile attacks from the backside,but it does not specifically require an antiperiplanar transition state; antiperiplanar geometry is a requirement for $E_2$ elimination reactions.Option $B$ is correct as $E_1CB$ (Elimination Unimolecular Conjugate Base) proceeds via a carbanion intermediate.Option $C$ is correct as ethanol undergoes dehydration in the presence of concentrated $H_2SO_4$ at $443 \ K$ to form ethene.Option $D$ is correct as Cannizzaro reaction is given only by aldehydes that do not have $\alpha$-hydrogen atoms. Acetone has $\alpha$-hydrogens,so it does not undergo the Cannizzaro reaction.

Which of the following statements is $INCORRECT$?

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