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JEE Main levelSingle correct optionDifficulty 2 of 3o4153

1-Bromopropane is treated with $NaCN$ in DMSO at room temperature. The major product is

Apropene
Bbutanenitrile
Cpropan-1-ol
Disobutyronitrile (2-methylpropanenitrile)

Answer: B

Cyanide is a good nucleophile and weak base, DMSO leaves it unsolvated and highly nucleophilic, and the substrate is a primary halide. SN2 gives

CH X_{3} CH X_{2} CH X_{2} CN

, butanenitrile.

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