KCET · Chemistry · General Organic Chemistry
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 \(120^{\circ}\)
Answer & Solution
Correct Answer
(B) There are three carbon-carbon single bonds and three carbon-carbon double bonds
Step-by-step Solution
Detailed explanation
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.
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.
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