Question

Which of the following diazonium salts is insoluble in water?

(a) C6H5N2^+Cl^–

(b) C6H5N2^+Br^–

(c) C6H5N2^+HSO4^–

(d) C6H5N2^+BF4^–

This question was posed to me by my college director while I was bunking the class.

My question is taken from Diazonium Salts Physical Properties topic in division Amines of Chemistry – Class 12

Answer 1

Correct answer is (d) C6H5N2^+BF4^–

The best explanation: Certain diazonium salts such as fluoroborates are insoluble in water. This makes them stable enough to be dried and stored.