Select the correct options for molecular formula ${\mathrm{C}}_2{\mathrm{H}}_2{\mathrm{Cl}}_2.$

$$\begin{gathered} {\mathrm{CH}}_3-\mathrm{CH}-\mathrm{CH}-\mathrm{CH}-{\mathrm{CH}}_3 \\ \overline{) \overline{) \overline{)}}} \\ \mathrm{Br} \mathrm{Br} \mathrm{Br} \end{gathered}$$

Total number of stereoisomers in above compound is:

$$\begin{gathered} {\mathrm{CH}}_3-\mathrm{CH}-\mathrm{CH}-\mathrm{CH}-{\mathrm{CH}}_3 \\ \overline{) \overline{) \overline{)}}} \\ \mathrm{Cl} \mathrm{Br} \mathrm{OH} \end{gathered}$$

Total number of stereoisomers in above compound is:

In the given structure, how many isopropyl groups are present as substituent?