Question

Which of the following correctly describes a hydrogen bond?

the bond between a hydrogen of an amino group and the oxygen of a carbonyl group

the bond between two carbonyl groups

the bond between the hydrogen of a hydroxyl group and a hydrogen in a methyl group

the bond between two methyl groups

the bond between a sodium cation and a chlorine anion

Answer 1

The correct answer is the first option, i.e. the bond between a hydrogen of an amino group and the oxygen of a carbonyl group.

Reason : First option is obviously correct since the other 4 options cannot form hydrogen bonds at all. Formation of hydrogen bonds takes place between Hydrogen from one functional group with highly electronegative atoms (Fluorine, Nitrogen and Oxygen) from other functional group. In the enlisted options, only the first one satisfies this criteria. Hydrogen bonding between carbonyl groups is not possible because of absence of Hydrogen atom in both of them. Hydroxyl and Methyl Groups cannot form hydrogen bond due to absence of electronegative atoms. Similarly two methyl groups also can't form hydrogen bonds. And lastly, cations and anions form Ionic bonds, not Hydrogen bonds.

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