Most soluble in water is (A) camphor (B) sulfur (C) common salt (D) sugar

The correct option is D

Sugar

Explanation for correct option:

(D) Sugar

• Sugar is the most soluble chemical in water among the substances listed.
• Sugar has six hydroxyl groups. They usually dissolve readily in warm or hot water.
• Sugar is made from sucrose, and its molecule is more complex and bigger than the ions in the salt.
• When energy is applied to polar sucrose molecules, intermolecular interactions with polar water molecules develop.
• And because the intermolecular interactions are relatively weak, it provides enough energy to destabilize the structure of both the pure solvent and the solute.
• As a result, sugar is most soluble in water.

Explanation for incorrect options:

(A) Camphor

• We must understand that camphor is a polar molecule with a ketone group in its structure.
• Camphor's polarity is caused by the existence of lone pairs of electrons on oxygen.
• It is also just marginally soluble in water. As a result, option (a) is incorrect.

(B) Sulphur

• Sulphur is a nonpolar element.
• As a result, Sulphur is insoluble in water.
• So, option (B) is erroneous.

(C) Common salt

• Sodium chloride ($\mathrm{NaCl}$) is an ionic substance that is commonly known as common salt.
• The common salt is polar in nature and water-soluble.
• However, common salt is not the most soluble of the compounds listed.
• As a result, option (C) is wrong.

So, the correct option is (D) sugar.