What are A and B in the following reactions?A | vedclass

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(D) and $B$ are precursors that can be reduced to form the primary amine $R-CH_2-NH_2$.$1.$ Nitriles $(R-CN)$ undergo catalytic hydrogenation with $H_

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$A = R-CN, B = R-CONH_2$

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(D) and $B$ are precursors that can be reduced to form the primary amine $R-CH_2-NH_2$.$1.$ Nitriles $(R-CN)$ undergo catalytic hydrogenation with $H_2/Ni$ to produce primary amines: $R-CN + 2H_2 \xrightarrow{Ni} R-CH_2-NH_2$$2.$ Amides $(R-CONH_2)$ are reduced by $LiAlH_4$ followed by hydrolysis to produce primary amines: $R-CONH_2 \xrightarrow[ii) H_2O]{i) LiAlH_4} R-CH_2-NH_2$Therefore,$A = R-CN$ and $B = R-CONH_2$.

What are $A$ and $B$ in the following reactions?
$A \xrightarrow{H_2 / Ni} R-CH_2-NH_2 \xleftarrow[ii) H_2O]{i) LiAlH_4} B$

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What are $A$ and $B$ in the following reactions?$A \xrightarrow{H_2 / Ni} R-CH_2-NH_2 \xleftarrow[ii) H_2O]{i) LiAlH_4} B$