Q. Decreasing order of C – C bond length is (I)$C_{2}H_{4}$ (II)$C_{2}H_{2}$ (III)$C_{6}H_{6}$ (IV)$C_{2}H_{6}$
A) $IV > III > I > II$
B) $I > II > IV > III$
C) $II > I > IV > III$
D) $IV > I > III > II$
Explanation
(a)
$C\ - \ C\$ bond length$= 1.54\ \mathring{\mathrm{A}}$
$C = \ C\$bond length$= 1.34\ \mathring{\mathrm{A}}$
$C\ \equiv \ C\$bond length$= 1.20{^\circ}\ \mathring{\mathrm{A}}$
Thus, correct decreasing order C to C bond lengths is
$IV > III > I > II$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.