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NEET CHEMISTRYMedium

In which of the following compounds is an intramolecular hydrogen bond present?

A

H2O2\text{H}_2\text{O}_2

B

HCN\text{HCN}

C

Cellulose

D

Concentrated acetic acid

Step-by-Step Solution

Let us examine the types of hydrogen bonding in the given compounds:

  1. H2O2\text{H}_2\text{O}_2: Forms extensive intermolecular hydrogen bonds, linking different H2O2\text{H}_2\text{O}_2 molecules together.
  2. HCN\text{HCN}: Forms linear chains through intermolecular hydrogen bonds between the hydrogen of one molecule and the nitrogen of another.
  3. Concentrated acetic acid: Exists as a dimer due to the formation of two intermolecular hydrogen bonds between two acetic acid molecules.
  4. Cellulose: It is a linear polymer of β\beta-D-glucose units. Extensive intramolecular hydrogen bonding occurs between the hydroxyl group at C-3 of one glucose unit and the ring oxygen (O-5) of the adjacent glucose unit in the same polymeric chain. This gives cellulose its characteristic rigid, straight-chain structure.
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