Total number of compounds with Chiral carbon atoms from following is ____. CH_3- CH_2- CH ( NO_2)- COOH; CH_3- CH_2- CHBr - CH_2- CH_3; CH_3- CH ( I…

Total number of compounds with Chiral carbon atoms from following is $\displaystyle \_\_\_\_$. $$\begin{aligned} & \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}\left(\mathrm{NO}_2\right)-\mathrm{COOH} \\ & \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CHBr}-\mathrm{CH}_2-\mathrm{CH}_3 \\ & \mathrm{CH}_3-\mathrm{CH}(\mathrm{I})-\mathrm{CH}_2-\mathrm{NO}_2 \\ & \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}(\mathrm{OH})-\mathrm{CH}_2 \mathrm{OH} \end{aligned} $$