Question

1. methanol (ch₃oh) molecules experience hydrogen bonding. which of the labels in the diagram to the right show hydrogen bonding?

a. only x
b. only y
c. only z
d. x, y and z

Explanation:

Hydrogen bonding occurs when a hydrogen atom covalently bonded to a highly electronegative atom (O, N, F) is attracted to another electronegative atom with a lone pair in a neighboring molecule.

• Label x: Connects a non-bonded H (not attached to O) to O, so not H-bond.
• Label y: Connects O's lone pair to H bonded to O of another molecule, fits H-bond.
• Label z: Shows a covalent O-H bond within a molecule, not an intermolecular H-bond.

Only label y represents hydrogen bonding.

Answer:

b. only y