The compound 'A' with molecular formula C_8H_ | vedclass

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(B) $1$. The molecular formula $C_8H_{10}$ corresponds to the degree of unsaturation $4$,indicating an aromatic ring with two alkyl substituents.$2$.

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$p-$Xylene

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(B) $1$. The molecular formula $C_8H_{10}$ corresponds to the degree of unsaturation $4$,indicating an aromatic ring with two alkyl substituents.$2$. $p-$Xylene ($1,4-$dimethylbenzene) has a high degree of symmetry. Due to the equivalence of positions,it yields only $1$ mononitro derivative.$3$. Upon further nitration,$p-$Xylene can yield $3$ dinitro isomers depending on the sequence of substitution and steric factors,making it the correct choice.

The compound '$A$' with molecular formula $C_8H_{10}$ (aromatic) which gives $1$ mononitro substituted product and $3$ dinitro substituted products is:

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