Which of the following groups of molecules can participate in a hydrogen bond as a hydrogen bond donor?

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The question asks which group can act as a hydrogen bond donor in a hydrogen-bonding interaction.
Option 1: NH3 +. This species has N–H bonds, and hydrogen attached to a highly electronegative nitrogen can be donated to an acceptor atom (like O or N) in another molecule. Even though the ammonium form is positively charged, it can still donate a hydrogen via its N–H bonds, so it can function as a hydrogen bond donor.
Option 2: CH3. This methyl group contains only C–H bonds with carbon as the attached atom; hydrogen bond donation typically requires hydrogen attached to a highly electronegative atom (such as N, O, or sometimes F). Since there is no N–H or O–H (or similar) bond, this cannot donate a hydrogen bond.
Option 3: C=O. In carbonyls, the oxygen atom is a strong hydrogen bond acceptor, but there are no hydrogens attached to the electronegative atoms that could be donated. Therefore, this molecule cannot act as a hydrogen bond donor.
Option 4: C=N-C. An imine nitrogen (N) could potentially be involved in hydrogen bonding as a donor only if it bore a hydrogen (i.e., N–H). In this structure, the nitrogen is bonded to carbons on both sides with no N–H present, so it cannot donate a hydrogen bond here.
In summary, only a species with N–H or O–H bonds can serve as a hydrogen bond donor in this set, and NH3 + fits that criterion. The others lack N–H or O–H bonds and thus cannot donate hydrogen bonds.

11:115:301:E (All) INTRO BIOCHEMISTRY End of Module 1 Quiz A

Which of the following groups of molecules can participate in a hydrogen bond as a hydrogen bond donor?

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