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Question

Which of these have inter-molecular hydrogen bond?


A

KH2PO4

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B

H3BO3

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C

C6H5COOH

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D

CH3OH

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Solution

The correct option is D

CH3OH


For H-bonding, H should be attached to a highly electronegative atom.

KH2PO4 is very similar to H3PO4. From VSEPR, you will see that H-bonding condition is satisfied.
From VSEPR, KH2PO4 looks like

H3BO3 looks like

Each H is attached to O and can form H-bonding.

Benzoic acid can form H-bonding by using H attached to O in the -COOH part.

In methanol

(CH3OH), the H atom attached to the electronegative O will form intermolecular H-bond with other methanol molecule.

Thus, A, B, C and D are right.


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