Question

Number of molecules from the following which can exhibit hydrogen bonding is ______. (nearest integer)

Answer 1

Correct Answer: 5

The inquiry concerns the identification of molecules capable of hydrogen bonding. Hydrogen bonding necessitates a hydrogen atom directly bonded to a highly electronegative element: nitrogen (N), oxygen (O), or fluorine (F). Analysis of each molecule is as follows:

• CH₃OH (Methanol): Possesses an OH group. The hydrogen atom is bonded to oxygen, facilitating hydrogen bond formation.
• H₂O (Water): Features two OH bonds, enabling hydrogen bond formation.
• C₂H₆ (Ethane): Lacks a hydrogen atom bonded to N, O, or F; consequently, it cannot form hydrogen bonds.
• C₆H₅NO₂ (Nitrophenol): Contains an OH group. The hydrogen atom is bonded to oxygen, permitting hydrogen bonding.
• HF (Hydrogen Fluoride): The hydrogen atom is bonded to fluorine, rendering it capable of forming hydrogen bonds.
• NH₃ (Ammonia): Contains nitrogen bonded to hydrogen, which enables hydrogen bonding.

Enumerating the molecules that can exhibit hydrogen bonding yields: CH₃OH, H₂O, C₆H₅NO₂, HF, and NH₃.

Therefore, the total count of molecules capable of hydrogen bonding is 5, aligning with the specified range of [5,5].