Halogenation of alkanes

Exercise 2

         

The complete combustion of a non-cyclic alkane provides masses of carbon dioxide and water which are in the ratio $2.037 $ . Find its molecular formula.

$C_nH_{2n+2}.....$ $\rightarrow $ $nCO_2+(n+1)H_2O$ $\frac{m_{CO_2}}{m_{H_2O}}=2,037$ $\frac{44n}{18(n+1)}=2,037$ d'où; $n=5$ $C_5H_{12}$

This alkane has only one monobromo derivative, two and three dibromoderivatives. Give all their line-angle formulas and their names!