C6H5NH2⟶NaNO2/HClX⟶CU2[CN]2Y⟶H2O/H+Z Z is identified as

A
${\bar{C}}_{6} H_{5} - NH - {CH}_{3}$
B
$C_{6} H_{5} - COOH$
C
$C_{6} H_{5} - {CH}_{2} - {NH}_{2}$
D
$C_{6} H_{5} - {CH}_{2} - COOH$

Solution:

$C_{6} H_{5} {NH}_{2} \underset{{NaNO}_{2} / HCl}{\to} C_{6} H_{5} N_{2} Cl \overset{{CU}_{2} {(CN)}_{2}}{\to} C_{6} H_{5} CN \underset{}{\overset{H_{2} O / H^{+}}{\to} C_{6} H_{5} COOH}$

Thus product Z is identified as $C_{6} H_{5} - COOH$

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