Q. 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) $C_{2}H_{4} > C_{2}H_{2} > C_{2}H_{6}$
D) All are equally reactive
Explanation
(c)
(i)Unsaturated hydrocarbons are more reactive than saturated hydrocarbons.
(ii)Among alkene and alkyne, alkene are more reactive because $C \equiv C$ is quite strong bond.
$\therefore$ Correct order of reactivity
Alkene>alkyne>alkane
or $C_{2}H_{4} > C_{2}H_{2} > C_{2}H_{6}$
ethene ethyne ethane
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.