Question

Write all the possible isomers for a benzene derivative having the molecular formula $C_{8}H_{10}$.

Answer 1

Since it is given as benzene derivative, a benzene ring ($C_6 H_{6-n}$) must be present. (Here n refers to the number of substituent/s present).

Out of the total 8 carbon atoms 6 are present in the ring. The other two carbon atoms may be present in the same substituent or two substituents (1+1).

The benzene derivative having the molecular formula $C_8H_{10}$ can be an ethyl derivative or dimethyl derivative.

Thus, the possible isomers are ethylbenzene ($C_6H_5C_2H_5$) and dimethylbenzene[$C_6H_4(CH_3)_2$] with the methyl substituents at ortho, para and meta positions.

Answer 2

Since it is given as benzene derivative, a benzene ring (C_6 H_{6-n}C6​H6−n​ ) must be present. (Here n refers to the number of substituent/s present).

Out of the total 8 carbon atoms 6 are present in the ring. The other two carbon atoms may be present in the same substituent or two substituents (1+1).

The benzene derivative having the molecular formula C_8H_{10}C8​H10​ can be an ethyl derivative or dimethyl derivative.

Thus, the possible isomers are ethylbenzene (C_6H_5C_2H_5C6​H5​C2​H5​ ) and dimethylbenzene[C_6H_4(CH_3)_2C6​H4​(CH3​)2​with the methyl substituents at ortho, para and meta