Reaction of $C_{6} H_{5} C H_{2} B r$ with aqueous sodium hydroxide follows

S_{N} 1

mechanism

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S_{N} 2

mechanism

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Any of the above two depending upon the temperature of reaction

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saytzeff rule

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Solution

The correct option is A $S_{N} 1$ mechanism
$C_{6} H_{5} C H_{2} B r$ on reaction with aqueous $N a O H$ shows $S_{N} 2$ mechanism since $N a O H$ is a strong nucleophile to form $C_{6} H_{5} C H_{2} O H$ .
It shows $S_{N} 1$ with a weak nucleophile and Saytzeff rule involves elimination reaction hence that is ruled out. Thus option (a) is correct.

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Reaction of $C_{6} H_{5} C H_{2} B r$ with aqueous sodium hydroxide follows ........

(a) $S_{N} 1$ mechanism

(b) $S_{N} 2$ mechanism

(d) Saytzeff rule

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