Which is the correct order for rate of hydrogenation?

Hept-1-ene < Hept-3-ene < 2-Methylhex-2-ene

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3-Methylcyclooctene < 1 - Methylcyclooctene < 1, 2-Dimethylcyclooctene

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3-Ethyloct-1-ene < 2-Ethyloct-1-ene < Oct-2-ene

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Ethene < ethyne

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Solution

The correct option is D Ethene < ethyne
Rate of hydrogenation $\propto \frac{1}{Stability of alkene or crowding across pi-bond}$

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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Write IUPAC names of the products obtained by the ozonolysis of the following compounds:
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(ii) 3,4-Dimethyl-hept-3-ene

(iii) 2-Ethylbut-1-ene

(iv) 1-Phenylbut-1-ene

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