Question

Which one of these is NOT TRUE for benzene?

• A. There are three carbon-carbon single bonds and three carbon-carbon double bonds
• B. It forms only one type of monosubstituted product
• C. The bond angle between the carbon-carbon bonds is $120^{\circ }$.
• D. The heat of hydrogenation of benzene is less than the theoretical value.

Answer 1

Answer: (A)

The structure of benzene is



Bond order $=\frac{\text{ number of bonds }}{\text{ number of resonating structures }}$

$=\frac{4}{3}=1.33$

Since, the bond order is in between single and double bond, thus it contains delocalised $\pi$ bonds. Hence, it is not possible to obtain number of single and double bonds in benzene.