Q54 / 160 · JIPMER 2007 · Chemistry

Which one of the following alkenes will react faster with $\mathrm{H}_2$ under catalytic hydrogenation conditions? $\text { ( } R=\text { Alkyl substituent })$

  • Correct answer
    A
    Figure
  • B
    Figure
  • C
    Figure
  • D
    Figure

Solution

Stability of alkene $\propto \frac{1}{\text { Heat of hydrogenation of alkene }}$ Greater the number of alkyl groups attached to the doubly bonded carbon atoms, more stable is the alkene. Hence, given alkene follow the following order of stability. Figure Hence, faster hydrogenation inFigure

Hence, the correct answer is option: 'A'.

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