12. In which of the following solutions are there dipole-induced dipole forces between the two components? a. CHCN in H_(2)O b Na_(2)SO_(4)inH_(2)O c. CCl_(4) in pentane, C_(3)H_(12) C_(5)H_(12)inH_(2)O c. I_(2)inC_(5)H_(12)

The correct answer is:<br /><br />a. $CHCN$ in $H_{2}O$<br /><br />Dipole-induced dipole forces occur when a polar molecule induces a dipole in a nonpolar molecule. In this case, $CHCN$ is a polar molecule, and $H_{2}O$ is a polar solvent. The polar $CHCN$ molecules will induce dipoles in the $H_{2}O$ molecules, resulting in dipole-induced dipole forces between the two components.