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(D) $AgCN$ is a covalent compound,so the nucleophilic attack occurs through the nitrogen atom,forming isocyanide $(RNC)$.$KCN$ is an ionic compound,so

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$I, II, III$ and $IV$

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(D) $AgCN$ is a covalent compound,so the nucleophilic attack occurs through the nitrogen atom,forming isocyanide $(RNC)$.$KCN$ is an ionic compound,so the nucleophilic attack occurs through the carbon atom,forming cyanide $(RCN)$.$KNO_2$ is an ionic compound,so the nucleophilic attack occurs through the oxygen atom,forming alkyl nitrite $(RONO)$.$AgNO_2$ is a covalent compound,so the nucleophilic attack occurs through the nitrogen atom,forming nitroalkane $(RNO_2)$.Therefore,all the given pairs are correctly matched.

Reaction	Product
$I$. $RX + AgCN$	$RNC$
$II$. $RX + KCN$	$RCN$
$III$. $RX + KNO_2$	$RONO$
$IV$. $RX + AgNO_2$	$RNO_2$

Which of the following pairs is/are correctly matched?

Reaction Product

$I$. $RX + AgCN$ $RNC$

$II$. $RX + KCN$ $RCN$

$III$. $RX + KNO_2$ $RONO$

$IV$. $RX + AgNO_2$ $RNO_2$

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Which of the following pairs is/are correctly matched? Reaction Product $I$. $RX + AgCN$ $RNC$ $II$. $RX + KCN$ $RCN$ $III$. $RX + KNO_2$ $RONO$ $IV$. $RX + AgNO_2$ $RNO_2$