Hydrogen bonding requires H attached to O, N, or F

Steps:

• Recall hydrogen bonding definition: strong dipole-dipole force when H is covalently bonded to highly electronegative O, N, or F, interacting with lone pairs on another molecule.
• Examine functional groups in each compound for O-H, N-H, or F-H presence.
• Eliminate options without such groups: A (CH3CHO) has C=O but no O-H.
• Confirm options with O-H: B and D (CH3OH) have alcohol -OH; C (HCOOH) has carboxylic -OH, but choices B/D duplicate creates ambiguity.

Why D is correct:

• CH3OH features an -OH group (H bonded to O), forming intermolecular hydrogen bonds that elevate boiling point beyond expected van der Waals forces (per hydrogen bonding definition).

Why the others are wrong:

• A: CH3CHO (acetaldehyde) lacks H on O; only weaker dipole-dipole from C=O.
• B: CH3OH identical to D; duplicate option, but D specified as correct.
• C: HCOOH (formic acid) has O-H for hydrogen bonding, but question ambiguity with duplicates.

Not enough information due to duplicate and conflicting options. Final answer: D