JEE Advanced 2025 Paper 1 · Q12 · Amines & Diazonium
The monomer X involved in the synthesis of Nylon-6,6 that gives a positive carbylamine test is analyzed by the Dumas method. If 10 moles of X are completely analyzed, find the mass (in grams) of nitrogen gas evolved. Atomic mass of $N = 14$.
Reveal answer + step-by-step solution
Correct answer:280
Solution
Nylon-6,6 is made from hexamethylenediamine (HMDA, $H_2N-(CH_2)_6-NH_2$) and adipic acid. The carbylamine test is positive only for primary amines; HMDA has two primary $-NH_2$ groups, so X = HMDA. Each molecule of HMDA contains 2 nitrogen atoms; 10 mol of HMDA contains 20 mol of N atoms. In the Dumas method all the nitrogen is converted to $N_2$ gas: 20 mol N atoms ⟹ 10 mol of $N_2$. Mass of $N_2$ = $10 \times 28 = 280$ g. Answer: 280.
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