Question

Intramolecular $H -$ Bond:
A. Decreases volatility
B. Increases melting point
C. Increases viscosity
D. Increases vapor pressure

Answer 1

We must need to know that intermolecular force (IMFs) happens between atoms. Different models incorporate common dipole-dipole collaborations and scattering powers. Hydrogen bonds are by and large more grounded than standard dipole-dipole and dispersion forces, yet more fragile than genuine covalent and ionic bonds.

Complete step by step answer:
We must need to remember that a hydrogen bond is an intermolecular force (IMF) that frames an uncommon kind of dipole-dipole fascination when a hydrogen iota attached to an emphatically electronegative particle exists in the region of another electronegative molecule with a solitary pair of electrons.
Intramolecular hydrogen bonds are those which happen inside one single atom. This happens when two functional groups of a particle can frame hydrogen bonds with one another. With the end goal for this to occur, both a hydrogen contributor and a hydrogen acceptor should be available inside one molecule, and they should be inside nearness of one another in the atom. For instance, intramolecular hydrogen holding happens in ethylene glycol $\left( {{C_2}{H_4}{{\left( {OH} \right)}_2}} \right)$ between its two hydroxyl groups because of the geometry of the molecule.
As we know that intramolecular $H^−$ holding expands the volatility. In chemistry, volatile describes the ability of a substance to vaporize. The vapor pressure is increased by intramolecular hydrogen bonding.
For instance, because of the essence of intramolecular $H^−$ holding among $OH$ and $N{O_2}$ groups ortho nitrophenol is more volatile.

So, the correct answer is Option A.

Note: We must need to remember that some of the factors preventing the hydrogen bonding is electronegativity, size of the atom. In nature, hydrogen bonding plays an important role in several biological processes and could be responsible for several natural phenomena. Hydrogen bonding is essential in the water transfer system of plants, secondary structure of protein, tertiary structure of protein, and base pairing of DNA.