A) I > II > III
B) I > III > II
C) III > II > I
D) II > I > III
Correct Answer: C
Solution :
As the steric hindrance increases, relative rates of hydrogenation decreases. Among the given alkenes, ethene is less hindered, so is more reactive. Thus, the order of reactivity of alkenes is \[\underset{\begin{align} & (III) \\ & (No\text{ }o,\text{ }n\text{ }hyperconjugative \\ & structure) \\ & \left( most\text{ }reactive \right) \\ \end{align}}{\mathop{C{{H}_{2}}=C{{H}_{2}}}}\,\,\,\,\,>\,\,\,\,\,\underset{\begin{smallmatrix} (II) \\ (3\text{ }or\text{ }n\text{ }hyperconjugative \\ structures) \end{smallmatrix}}{\mathop{C{{H}_{3}}CH=C{{H}_{2}}}}\,\] \[\underset{\begin{smallmatrix} (6\text{ }cr\text{ }\pi \text{ }hyperconjugative \\ structures) \end{smallmatrix}}{\mathop{>\,\,\,\,{{(C{{H}_{3}})}_{2}}=C{{H}_{2}}}}\,\]
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