Question

Select the true / false statements.
$S_1$: The rate of catalytic hydrogenation of 2-butyne is greater than trans 2-butene.
$S_2$: The rate of reduction of $C{H}_2=O$ is slower than $(C{H}_3{)}_{2}C=O$ by $LiAl{H}_4$.
$S_3$: The aqueous solution of $C{H}_{3}MgBr$ is used for $S_{N}2$ reaction with primary alkyl halides.

• A. F F F
• B. T F T
• C. T F F
• D. T T T

Answer 1

The correct option is C T F F

The rate of catalytic hydrogenation of 2-butyne is greater than trans 2-butene as trans 2-butene is more stable than 2-butyne.
The rate of reduction of $C{H}_2=O$ is larger than $(C{H}_3{)}_{2}C=O$ by $LiAl{H}_4$.
This is due to steric and electronic effects.
The aqueous solution of $C{H}_{3}MgBr$ cannot be used for $S{N}_2$ reaction with primary alkyl halides as it will hydrolyze $C{H}_{3}MgBr$.