Number of bromo derivatives obtained on treating ethane with excess of Br 2 in diffused sunlight is _ _ _ _…

A substitution reaction is a chemical reaction during which one functional group in a chemical compound is replaced by another functional group.The number of different substitution products possible when ethane is allowed to react with bromine in sunlight are $9$.

${\mathrm{CH}}_3-{\mathrm{CH}}_3+{\mathrm{Br}}_2\stackrel{\mathrm{sunlight}}{\to }{\mathrm{CH}}_3-{\mathrm{CH}}_2\mathrm{Br}+{\mathrm{CH}}_2\mathrm{Br}-{\mathrm{CH}}_2\mathrm{Br}+{\mathrm{CH}}_2\mathrm{Br}-{\mathrm{CHBr}}_2+{\mathrm{CHBr}}_2-{\mathrm{CHBr}}_2+{\mathrm{CBr}}_3-{\mathrm{CBr}}_3+{\mathrm{CH}}_3-{\mathrm{CHBr}}_2+{\mathrm{CH}}_3-{\mathrm{CBr}}_3+{\mathrm{CH}}_2\mathrm{Br}-{\mathrm{CBr}}_3+{\mathrm{CHBr}}_2-{\mathrm{CBr}}_3$

$6$ Bromine atoms: $1$ product possible

$5$ Bromine atoms : $1$ product possible

$4$ Bromine atoms : $2$ products possible

$3$ Bromine atoms : $2$ products possible

$2$ Bromine atoms : $2$ products possible

$1$ Bromine atom : $1$ product possible

Total $9$ products possible