Identify the reagents $A$ and $B$ in the following reaction. $\mathrm{CH}_3 \mathrm{CH}_3…
Identify the reagents $A$ and $B$ in the following reaction.
$\mathrm{CH}_3 \mathrm{CH}_3 \stackrel{(B)}{\longleftrightarrow} \mathrm{CH}_3 \mathrm{COOH} \stackrel{(A)}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$
$A=\mathrm{HI} /$ red $\mathrm{P}$ and $B=\mathrm{LiAlH}_4$
$A=\mathrm{Ni} / \Delta$ and $B=\mathrm{LiAlH}_4$
$A=\mathrm{Pd} / \mathrm{BaSO}_4$ and $B=\mathrm{Zn} / \mathrm{HCl}$
$A=\mathrm{LiAlH}_4$ and $B=\mathrm{HI} /$ red $\mathrm{P}$
Solution
$\mathrm{LiAlH}_4$ is a strong reducing agent that reduces carboxylic acid to alcohol and $\mathrm{HI} /$ Red $\mathrm{P}$ reduces the acid to corresponding alkane.
$\underset{\text { Acetic acid }}{\mathrm{CH}_3 \mathrm{COOH}} \xrightarrow[(A)]{\mathrm{LiAlH}_4} \underset{\text { Ethanol }}{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}}$
$\underset{\text { Acetic acid }}{\mathrm{CH}_3 \mathrm{COOH}} \xrightarrow[(B)]{\mathrm{HI} / \mathrm{Red} \mathrm{P}} \underset{\text { Ethene }}{\mathrm{CH}_3 \mathrm{CH}_3}$