Question

The given compound can be synthesized by a $S_{N}2$ reaction. Select both the haloalkane and nucleophile that will give the product.

${CH}_3{CH}_2{{CH}_{2}PH}_2$

• A. $C{H}_{3}CHClC{H}_3$
• B. $C{H}_{3}C{H}_{2}C{H}_{2}Cl$
• C. $P{H}_3$
• D. $P{H}_5$

Answer 1

Answer: (B), (C)

The correct options are
B $P{H}_3$
C $C{H}_{3}C{H}_{2}C{H}_{2}Cl$

${CH}_3{CH}_2{{CH}_{2}PH}_2$ can be synthesized by the combination of halo alkane ${CH}_3{CH}_2{CH}_{2}Cl$ and nucleophile ${PH}_3$.

${CH}_3{CH}_2{CH}_{2}Cl+{PH}_3⟶{CH}_3{CH}_2{{CH}_{2}PH}_2+HCl$

In this reaction, the chloride ion of propyl chloride is displaced with $-{PH}_2^{-}$ group.