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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
Order of reactivity of ${C_2}{H_6},{C_2}{H_4}$ and ${C_2}{H_2}$ is
  • A
    ${C_2}{H_6} > {C_2}{H_4} > {C_2}{H_2}$
  • B
    ${C_2}{H_2} > {C_2}{H_6} > {C_2}{H_4}$
  • ✓
    ${C_2}{H_2} > {C_2}{H_4} > {C_2}{H_6}$
  • D
    All are equally reactive
✓

Answer

Correct option: C.
${C_2}{H_2} > {C_2}{H_4} > {C_2}{H_6}$
c
(c)Unsaturated hydrocarbons are more reactive than saturated hydrocarbons. Among ethyne $({C_2}{H_2})$ and ethene $({C_2}{H_4})$ the later is more reactive as $C \equiv C$ triple bond is quite strong bond and therefore ethyne generally require catalysts (like $H{g^{2 + }}$ etc) in its reactions.

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