Give reasons for the following: (a) Po...

Give reasons for the following:
(a) Potassium cyanide reacts with R -X to give alkyl cyanide. While silver cyanide forms an isocyanide as a major product.
(b) Silver nitrite reacts R-X to give a mixture of nitroalkane and alkyl nitrite.
(c) R-OH does not react NaBr but on adding `H_(2)SO_(4)`, it forms R-Br.
(d) Alcohols do not undergo substitution in neutral or alkaline solution.

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