Question

# Which of the following molecules are expected to exhibit inter-molecular $$H-$$bonding?

A
Acetic acid
B
o-Nitrophenol
C
m-Nitrophenol
D
o-Boric acid

Solution

## The correct option is A Acetic acidThe two conditions given for hydrogen bonding are:1) A hydrogen atom must be covalently bonded to $$O,\ N$$ or $$F$$ atom. We can understand this part, as $$O,\ N$$ and $$F$$ are highly electronegative and will leave the $$H$$ with a positive dipole (more or less a $$H^+$$ ion).2) The other condition is that the atom with a lone pair which the $$H$$ is hydrogen-bonded to must be $$O,\ N$$ or $$F$$. Acetic acid dimerises as shown in the image and there exists an inter-molecule are $$H-$$bonding between the molecules.Chemistry

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