X g of nitrobenzene on nitration gave 4.2 g of m -dinitrobenzene. X = ____ g. (nearest integer) [Given: molar mass (in g mol^-1 ) C: 12, H: 1, O: 16,…

X g of nitrobenzene on nitration gave $\displaystyle 4.2$ g of m -dinitrobenzene. $\displaystyle \mathrm{X}=$ $\displaystyle \_\_\_\_$ g. (nearest integer) [Given : molar mass (in $\displaystyle \mathrm{g} \mathrm{mol}^{-1}$ ) $\displaystyle \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16, \mathrm{~N}: 14$ ]