Identify $A$ and $B$ in the following reaction $\mathrm{CH}_3-\mathrm{CH}_3 \stackrel{B}{\longleftarrow}…
Identify $A$ and $B$ in the following reaction
$\mathrm{CH}_3-\mathrm{CH}_3 \stackrel{B}{\longleftarrow} \mathrm{CH}_3 \mathrm{COOH} \stackrel{A}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$
$\text { A } \quad \text { B }$
$\mathrm{HI}+$ red $\mathrm{P} \quad \mathrm{LiAlH}_4$
Acetic acid on reduction with lithium aluminiumhydride $\left(\mathrm{LiAlH}_4ight)$ gives ethyl alcohol while on reduction with $\mathrm{HI}$ and red $\mathrm{P}$ gives ethane.
$$
\mathrm{CH}_3 \mathrm{COOH} \stackrel{\mathrm{LiAlH}_4}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}
$$
ethyl alcohol
$$
\mathrm{CH}_3 \mathrm{COOH} \stackrel{\text { Red P }+\mathrm{HI}}{\longrightarrow} \mathrm{CH}_3-\mathrm{CH}_3
$$
Hence, reagent $A$ and $B$ are respectively $\mathrm{LiAlH}_4$ and $\mathrm{HI} /$ red P.
^