Octane is a component of fuel used in internal combustion engines. the dominant intermolecular forces in octane are

a. dipole-dipole forces

b. london dispersion forces

c. hydrogen bonding

d. covalent bonds

b. London dispersion forces

Explanation:

Dipole-dipole interaction:-

This is the interaction between the two dipoles in the molecule which is formed by varying electronegativities.

London dispersion forces:-

The bond in the molecule is octane, which is non-polar in nature because the carbon and hydrogen atoms have almost same electronegativity values.

The intermolecular force acting in the molecule are induced dipole-dipole forces or London Dispersion forces / van der Waals forces which are the weakest intermolecular force.

Answer - B.

Hydrogen bonding:-

Hydrogen bonding is a special type of the dipole-dipole interaction and it occurs between hydrogen atom that is bonded to highly electronegative atom which is either fluorine, oxygen or nitrogen atom.

Partially positive end of the hydrogen atom is attracted to partially negative end of these atoms which is present in another molecule. It is strong force of attraction between the molecules.

Covalent bonds:-

Covalent bond is the bond which is formed with the sharing of the electrons between the two atoms which are taking part in the bond. It is generally formed between the atoms with similar electronegativity values.

It is the bond which is generally occurs within non metals as they share electrons to complete their octet.

The difference in the electronegativity values of the atoms involving in a covalent bond must not exceed the value of 1.7 .