# Question #6cd98

To take methane for an example, clearly, each $\angle H - C - H = {109.5}^{\circ}$. For water, the lone pairs on the oxygen atom compress the $\angle H - O - H$ to approx. ${105}^{\circ}$. For $B C {l}_{3}$, a trigonal planar molecule, $\angle C l - B - C l = {120}^{\circ}$.