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Compounds Containing Nitrogen question

2002 · Shift 0 · Q23
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Compounds Containing Nitrogen question

2002 · Shift 0 · Q23

JEE MainChemistryCompounds Containing NitrogenMCQ+4 / −1
When primary amine reacts with chloroform in ethanoic KOH then the product is
  1. A
    an isocyanide
  2. B
    an aldehyde
  3. C
    a cyanide
  4. D
    an alcohol
View written solutionFree

Correct answer: A

  1. Identify the reaction

A primary amine reacts with chloroform in alcoholic/ethanolic KOH by the carbylamine reaction.

The general reaction is:

RNH2+CHCl3+3KOH→RNC+3KCl+3H2ORNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2ORNH2​+CHCl3​+3KOH→RNC+3KCl+3H2​O

where RNH2RNH_2RNH2​ is a primary amine and RNCRNCRNC is an isocyanide (carbylamine).

  1. What does this reaction produce?

The product formed is isocyanide, not cyanide.

  • Isocyanide: R−N≡CR-N\equiv CR−N≡C
  • Cyanide: R−C≡NR-C\equiv NR−C≡N

These are different compounds.

  1. Check the options
  • A: an isocyanide ✅ Correct
  • B: an aldehyde ❌ Not formed
  • C: a cyanide ❌ Not formed in carbylamine reaction
  • D: an alcohol ❌ Not formed
  1. Final answer

Therefore, when a primary amine reacts with chloroform in ethanolic KOH, the product is an isocyanide.

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