Iodine dissolves readily in:

Correct answers: (b) Carbon tetrachloride or (c) Alcohol

Explanation

Iodine (I₂) is a non-polar molecule. By the rule "like dissolves like", it dissolves well in non-polar solvents such as carbon tetrachloride, giving a violet solution, and only very slightly in water, which is polar.

Iodine also dissolves well in alcohol, giving the brown tincture of iodine used as an antiseptic. It dissolves in potassium iodide solution too, but by a reaction: I₂ + I⁻ → I₃⁻.

The book's key is (b), the textbook example of a non-polar solvent. Iodine actually dissolves even more in alcohol (tincture of iodine), so (c) is also accepted.