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Question

Which is the correct order for rate of hydrogenation? 
  1. Hept-1-ene < Hept-3-ene < 2-Methylhex-2-ene
  2. 3-Ethyloct-1-ene < 2-Ethyloct-1-ene < Oct-2-ene
  3. Ethene < ethyne
  4. 3-Methylcyclooctene < 1 - Methylcyclooctene < 1, 2-Dimethylcyclooctene


Solution

The correct option is C Ethene < ethyne
Rate of hydrogenation 1Stability of alkene or crowding across pi-bond

As alkynes are linear , less hindered and thermodynamically less stable than alkene, the rate of hydrogenation will be maximum in alkyne than that of alkene. So, the correct answer will be option (d).

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