Which one of the following reducing agents is likely to be most effective in bringing about the following change?
$R - O | | C - N H_{2} \to R C H_{2} N H_{2}$

H_{2} - N i

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N a B H_{4}

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L i A l H_{4}

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N a -

alcohol

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Solution

The correct option is B $L i A l H_{4}$
$R - C O - N H_{2} L i A l H_{4} - --- \to R C H_{2} N H_{2}$
This reaction is the reduction of primary amides in the presence of the reducing agent $L i A l H_{4}$ to primary amines.

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