Halogenation of alkanes

Exercise 1

Give line-angle (skeletal) formulas of all the isomers of molecular formula $C_6H_{14}$

Mark the non-equivalent positions that can lead to different monochloroalcanes by substituting a $H$ by a $Cl $ atom.

For these monochloralkanes, mark the positions where the chlorine atom will produce two enantiomers $S$ and $R$