In which of the following reaction cyanide will be obtained as a major product?

P h - O | | C - C H_{3} (i) L i A l H_{4} \to (i i) H_{3} O^{+}

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P h - O | | C - N H_{2} N a O H \to B r_{2}

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P h - O | | C - N H_{2} P_{4} O_{10} \to

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P h - O | | C - O - H S O C l_{2} \to N H_{3} \to

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Solution

The correct option is B $P h - O | | C - N H_{2} P_{4} O_{10} \to$
$\Rightarrow$ In general,an alkyl or aryl amide reacts with $P_{4} O_{10}$ to give the corresponding Nitrile/cyanide.
$\Rightarrow$ Here, Benzamide would give benzo-nitrite.
$P_{4} O_{10}$ acts as a dehydrating agent .

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