Part of the reasoning that led van't hoff and le bel to propose a tetrahedral shape for methane, ch4, was based on the number of compounds that are theoretically possible for substituted methanes; that is, compounds in which one or more hydrogens have been replaced by some other group. for example, only one compound of the type ch2x2 has ever been found. is this consistent with a tetrahedral shape? with a square planar shape? provide an explanation for each answer using appropriate diagrams.

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?