Which of the following will react with $\mathrm{CHCl}_{3}+$ alc. KOH ?

JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Biomolecules

Which of the following will react with

CHCl_{3} +

alc. KOH ?

(A)Adenine and proline
(B)Adenine and lysine✓ Correct
(C)Adenine and thymine
(D)Thymine and proline

Answer: (B)

Solution

The carbylamine test, with

CHCl X_{3}

and alcoholic

KOH

, is given only by primary amines, which are converted to foul-smelling isocyanides. Adenine carries a primary

- NH X_{2}

group at position

6

, and lysine has a primary amino group on its side chain, so both respond. Proline is a secondary (cyclic) amine and thymine has no amino group, so they do not. The pair that reacts is adenine and lysine.

JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Single correct option

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