# Which of these molecules have dipole-dipole forces? $(1) \;CO_2 \quad (2) \; CH_2Cl_2 \quad (3)\; CH_4$
$\begin{array}{1 1} Only\;(1) CO_2 \\All \;of\;them\;have\;dipole-dipole\;forces \\ Only\;(2) CH_2 Cl_2 \\ Both (2)\;Ch_2Cl_2\;and\;(3)\;CH_4 \mu T \end{array}$