$R - {CH}_{2} - {CH}_{2} OH$ can be converted into ${RCH}_{2} {CH}_{2} COOH$ The correct sequence of the reagents is

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${PBr}_{3}, KCN, H_{3} O^{+}$

$HCN, {PBr}_{3}, H^{+}$

${PBr}_{3}, KCN, H_{2}$

$KCN, H^{+}$

answer is A.

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Detailed Solution

$R - {CH}_{2} {CH}_{2} OH \overset{{PBr}_{3}}{⟶} R - {CH}_{2} {CH}_{2} - Br \overset{KCN}{⟶} R - {CH}_{2} - {CH}_{2} - CN \overset{H_{3} O^{+}}{⟶} R - {CH}_{2} - {CH}_{2} COOH + {NH}_{3}$

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