NEETChemistryAmines
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Primary aliphatic amines react with nitrous acid to release nitrogen gas quantitatively. Reason (R): Aliphatic diazonium salts are highly unstable and decompose to yield alcohols and nitrogen gas. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
According to NCERT, primary aliphatic amines react with nitrous acid (prepared in situ from NaNO ₂ and HCl ) to form aliphatic diazonium salts. These aliphatic diazonium salts are highly unstable, even at low temperatures, and immediately decompose to liberate nitrogen gas quantitatively along with the formation of alcohols. The quantitative evolution of nitrogen gas is practically used in the estimation of amino acids and proteins. Thus, the Assertion (A) is a correct statement. The Reason (R) correctly states the