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JEE Advanced2010ChemistryHydrocarbonsActual

The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are

Options

  1. ABrCH ₂ CH ₂ CH ₂ CH ₂ CH ₃ and CH ₃ CH ₂ C CH
  2. BBrCH ₂ CH ₂ CH ₃ and CH ₃ CH ₂ CH ₂ C CH
  3. CBrCH ₂ CH ₂ CH ₂ CH ₂ CH ₃ and CH ₃ C CH
  4. DBrCH ₂ CH ₂ CH ₂ CH ₃ and CH ₃ CH ₂ C CH a)

Correct answer

D. BrCH ₂ CH ₂ CH ₂ CH ₃ and CH ₃ CH ₂ C CH a)

Step-by-step solution

CH ₃- CH ₂- C C - CH ₂- CH ₂- CH ₂- CH ₃ There are two (marked) possibility of halides Thus, in the given context array r CH ₃ CH ₂ C CH + NaNH ₂ CH ₃ CH ₂- C CNa ⁺ array aligned CH ₃ CH ₂ C CNa CH ₃ CH ₂ C BrCH ₂ CH ₂ CH ₂ CH ₃ 3-octyne CH ₂ CH ₂ CH ₂ CH ₃ aligned Hydrocarbon Conceptual, reaction understanding II

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