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Question

An alkyl halide, RX reacts with KCN to give propane nitrile is :

A
C3H7Br
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B
C4H9Br
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C
C2H5Br
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D
C5H11Br
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Solution

The correct option is C C2H5Br
KCN is predominantly ionic and provides cyanide ions in its solution. In the presence of alcoholic KCN alkyl halides gives alkyl cyanides.
C2H5Br + KCN C2H5CN+KBr
So, RX reacts with KCN to give propane nitrile is C2H5Br.

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