Final answer:
The HCH bond angle in methanol is approximately 109.5 degrees due to the tetrahedral geometry, and the COH bond angle is also roughly 109.5 degrees, slightly adjusted for lone pair repulsion.
Step-by-step explanation:
The approximate values for the HCH and COH bond angles in methanol, CH3OH, can be deduced from understanding the molecular geometry of the molecule. Methanol has a tetrahedral geometry around the carbon atom which means that the H-C-H bond angles are approximately 109.5 degrees. The COH bond angle is slightly less due to the repulsion caused by the lone pairs on the oxygen, which is not exactly 109.5 degrees, but for simplicity in this context, we can consider it approximately 109.5 degrees as well.
Hence, the correct answer would be that the HCH bond angle is about 109.5 degrees, and COH bond angle is roughly 109.5 degrees, coinciding with the values found in a tetrahedral geometry and slightly adjusted based on lone pair repulsion. Therefore, option (b) HCH: 109.5 degrees, COH: 120 degrees is incorrect, and the answer is not provided amongst the options given.