Explanation
Ethyl benzene cannot be prepared by wurtz reaction as it is unsymmetrical.
The C-C bond length in benzene in between that of C-C and C=C i.e in between that of C2H6 and C2H4.
According to X-ray analysis, all C-C bond distance are equal in benzene . The bond order of C-C bond is 1.5 in benzene.
Therefore, C-C bond distance is less than C-C single bond are more than C=C double bond.
-NO2, group withdraw electron from the rings show M-effect makes ring electron deficient, thus deactivates ring for electrophilic substitution .
A group that causes attack to occur chiefly at positions ortho and para , it is ortho-para director. Example : NH2 , OH, Cl etc.
According to Huckel’s rule the molecules which (4n+2) π-electrons are aromatic .
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