Consider the isomers of hydrocarbon with molecular formula C_5 H_10. These isomers do not decolourise KMnO_4 solution. These isomers are subjected to…

Consider the isomers of hydrocarbon with molecular formula $\displaystyle \mathrm{C}_5 \mathrm{H}_{10}$. These isomers do not decolourise $\displaystyle \mathrm{KMnO}_4$ solution. These isomers are subjected to chlorination with chlorine in presence of light to give monochloro compounds. The total number of monochloro compounds (structural isomers only) formed is $\displaystyle \_\_\_\_$.