Which of the following is disinfectant
i) $0.2\%$ solution of phenol
ii) $1\%$ solution of phenol
iii) $0.3ppm$ aqueous solution of $C{l}_2$
iv) dilute Solution of Boric acid

0.2 per cent solution of phenol is an antiseptic while its one percent solution is disinfectant. Chlorine in the concentration of 0.2 to 0.4 ppm in aqueous solution and sulphur dioxide in very low concentrations, are disinfectants.

Boric acid in dilute aqueous solution is weak antiseptic for eyes.