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MHT CET Medical202622 April 2026Morning ShiftChemistryHydrocarbonsActual

Which of the following gases is evolved as a byproduct (A) in the following reaction, HC CH + LiNH ₂ solvent HC = C ^- Li ^+ + ( A )

Options

  1. AN ₂
  2. BH ₂
  3. CNH ₃
  4. DO ₂

Correct answer

C. NH ₃

Step-by-step solution

The reaction between ethyne and lithium amide is an acid-base reaction. Ethyne has acidic hydrogen atoms due to the sp hybridized carbon atom. Lithium amide is a strong base. The amide ion abstracts a proton from ethyne to form lithium acetylide and ammonia gas. HC CH + LiNH ₂ HC C ^- Li ^+ + NH ₃ The byproduct (A) is NH ₃ . Answer: NH ₃

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