Correct answer is : (D.)
CH3CH2CH2CH2CH3
Explanation
Water is a polar solvent and only the substances having same
intermolecular forces as water are soluble in water.
The major intermolecular forces present in water are hydrogen
bonding and dipole-dipole intermolecular forces.
pentane
CH3CH2CH2CH2CH3
neither has hydrogen bonding nor dipole-dipole intermolecular
forces. Hence, pentane will not dissolve in water.