10,26 g compus monobromurat s-au obtinut la 80%... dar cat s-ar fi obtinut la 100%
=> 10,26 g ............. 80%
a ........................ 100% => a = 12,825 g
6,90 g 12,825 g
CnH2n-6 + Br2 ----> CnH2n-7Br + HBr
14n-6 14n-7+80
=> 14n+73 = 1,859(14n-6)
=> n = 84,154/12 = 7
=> toluen, C6H5CH3 => D.