i need help

Given the structure of methyl formate, predict the bond angles, (a) Give the HC=O bond angle in methyl formate. HC=O bond angle: (b) One dihedral angle in methyl formate relates the plane containing the O=CO bonds to the plane containing the C - OC bonds. Identify two structures of methyl formate: one in which this dihedral angle is 0 and the other in which it is. 180. The structure with a dihedral angle of 0 is: The structure with a dihedral angle of 180 is