Question

An unknown compound has molecular formula $C_6{H}_{10}$.

When a solution of $B{r}_2$ in $CC{l}_4$ is added to the unknown, the bromine colour disappears. What information does this provide about the structure of unknown?

1) It has olefinic bond

2) It has aldehydic group

3) It has alcoholic group

Answer 1

When a solution of $B{r}_2$ in $CC{l}_4$ is added to the unknown, the bromine colour disappears. This indicates that the unknown compound either contains a carbon carbon double bond or carbon carbon triple bond. A molecule of bromine is added to multiple bond. This results in decolorization.