(b)
Benzamide on treatment with $POCl_{3}\ \$gives$\$benzonitrile (phenyl cyanide) because in this reaction $POCl_{3}$ acts as dehydrating agent and on dehydration of benzamide, benzonitrile is obtained.
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.