Question

The correct statements of the following are:
I. shaving soaps contain glycerol and rosin
II. Liquid detergents used for dishwashing belong to non-ionic type
III. Unbranched hydrocarbon detergents are non-biodegradable

• A. I, II only
• B. II, III only
• C. I, III only
• D. I, II, III

Hint:

Straight-chain (unbranched) surfactants are biodegradable.
Branching in the hydrophobic tail of a detergent prevents bacterial enzymes from breaking it down, leading to persistent foam in water bodies.

Answer 1

The Correct Option is A

Step 1: Check Statement I.
Shaving soaps do contain glycerol, which keeps the soap from drying out too fast, and rosin, which forms sodium rosinate and boosts lather, true.
Step 2: Check Statement II.
Dishwashing liquid detergents are indeed of the non-ionic type, true.
Step 3: Check Statement III carefully.
Biodegradability actually tracks chain branching, straight unbranched hydrocarbon chains are the ones bacteria break down easily, while branched chains resist microbial attack, so this statement has the logic reversed, false.
Final answer: Option 1, I and II only.