1.

Which one of these is NOT true for benzene

Answer»

it forms only one type of monosbustituted product
There are three carbon-carbon SINGLE bonds double bonds
The heat of hydrogenation of benzene is less than the theoretical VALUE
The BOND angle between the carbon -carbon bonds is `120^@`

Solution :Resonance gives each C-C bond in benzene some double bond character and this has been confimed by measuring bond length between two adjacent carbon atom in various compounds of benzene . The bond length C-C (`sigma` bond as in ethane) is 1.54 Å and C=C (double bond as in ethene ) is 1.33 Å.The carbon to carbon bond length in benzene has been found to be 1.39 Å which lies between single and double bond length values


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