Question

The values of bond energies of single, double and triple bonds are in the order :

• A. $C-C>C=C>C\equiv C$
• B. $C=C>C-C>C\equiv C$
• C. $C\equiv C>C=C>C-C$
• D. $C=C>C\equiv C>C-C$

Answer 1

The correct option is C $C\equiv C>C=C>C-C$

The bond order and bond length are related in the frolowing way:-

Bond length $\alpha \frac{1}{\text{Bond order}}$ $\alpha \frac{1}{\text{No of Bonds}}$

Bond energy is directly proportional to bond order as the bond order is directly proportional to no. of bonds and inversely proportional to bond length.

So as the no of bonds in triple bond is maximum (3), then bond order is

maximum and bond length is minimum and similaly the no of bonds for

single bond is least so bond length is maximum and bond energy is minimum.

$C\equiv C>C=C>C-C$

Oplion: $C$