AP BIOLOGY

BIOCHEMISTRY

POLAR AND NONPOLAR MOLECULES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Hydrogen bonding occurs between adjacent molecules that contain hydrogen atoms bonded to N, O, or F. Which of the following molecules could experience hydrogen bonding interactions?

A	CBr4
B	NO2
C	H2S
D	NH3

Explanation:

Detailed explanation-1: -A hydrogen bond is an intermolecular force (IMF) that forms a special type of dipole-dipole attraction when a hydrogen atom bonded to a strongly electronegative atom exists in the vicinity of another electronegative atom with a lone pair of electrons. Intermolecular forces (IMFs) occur between molecules.

Detailed explanation-2: -When hydrogen bonding takes place between different molecules of the same or different compounds, it is called intermolecular hydrogen bonding. For example – hydrogen bonding in water, alcohol, ammonia etc.

Detailed explanation-3: -NH3 accepts hydrogen bonds in the complexes H3N-HCN (9), H3N-HF (10), H3N-HOH (11), H3N-HCI (12), H3N-HBr (13), H3N-HCCH (14), H3N-HCF3 (15), and H3N-HSH (16). Because NH3 can serve as a hydrogen-bond acceptor with even the weakest donors, it serves as an ideal calibrant of gas-phase acidities.

There is 1 question to complete.