question_answer

Which one of these is not true for benzene?

A)  It   forms   only   one   type   of monosubstituted product

B)  There are three carbon-carbon single bonds and three carbon-carbon double bonds

C)  The heat of hydrogenation of benzene is less than the theoretical value

D)  The   bond   angle   between   the carbon-carbon bonds is \[{{120}^{o}}\]

Correct Answer: B

Solution :

The structure of benzene is Bond order \[=\frac{number\,of\,bonds}{number\,of\,resonating\,structures}\] \[=\frac{4}{3}=1.33\] Since, the bond order is in between single and double bond, thus it contains delocalised n bonds. Hence, it is not possible to obtain number of single and double bonds in benzene.