Question

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

• A. ${H_2O_2}$
• B. $HCN$
• C. Cellulose
• D. Concentrated acetic acid

Answer 1

The Correct Option is C

To determine which compound exhibits intramolecular hydrogen bonding, let's first understand what intramolecular hydrogen bonding is. Intramolecular hydrogen bonding occurs when hydrogen bonds form within a single molecule, between hydrogen and a more electronegative atom like oxygen or nitrogen within the same molecule.

1. ${H_2O_2}$ (Hydrogen Peroxide): In hydrogen peroxide, each oxygen atom is bonded to a hydrogen atom, forming hydrogen bonds between the hydrogen of one molecule and the oxygen of another molecule, which is intermolecular rather than intramolecular hydrogen bonding.
2. $HCN$ (Hydrogen Cyanide): In ${HCN}$, the molecule is linear, with no opportunity for intramolecular hydrogen bonding to occur due to the absence of an internal arrangement conducive to hydrogen bonds within the same molecule.
3. Cellulose: Cellulose is a polymer consisting of long chains of glucose molecules. It features hydroxyl groups which can form hydrogen bonds, primarily intermolecular, contributing to the strength and rigidity of cellulose fibers. However, in a broad understanding, cellulose can also exhibit intramolecular interactions when considering its structure within segments of the polymer chain.
4. Concentrated Acetic Acid: In acetic acid, hydrogen bonds form between the molecules (intermolecular hydrogen bonding) but not within a single acetic acid molecule (no suitable arrangement exists for intramolecular hydrogen bonding).

Given these explanations, Cellulose can be shown as having intramolecular hydrogen bonding when considering its structural configuration within segments of its polymer chain.