Various phenol derivatives, tincture of iodine (2-3% I2 in water/alcohol) and some dyes like methylene blue are

(2) disinfectants.

(3) analgesics.

(4) antipyretics.

Answer : from all above options the correct answer is “(1) antiseptics.“

explanation of answer : Lesser concentration of phenol acts like antiseptic. Tincture of iodine in ethanol is used to treat wounds. Methylene blue is used as an antidote to cyanide and has veterinary use as antiseptic. antiseptics substances or medicines or drugs which have capability to destroy micro-organism . some basic examples of antiseptics are Phenol, Iodoform KMnO4 etc. so we can say that Various phenol derivatives, tincture of iodine (2-3% I2 in water/alcohol) and some dyes like methylene blue are called antiseptics that is why we have given answer it as our correct answer.