(i) Ranitidine – (c) Antihistamine

Histamines are nitrogenous compounds found inside human tissues which cause dilation of capillaries, contraction of some muscles and are released during allergic reactions. Thus antihistamines are those medicines which suppress these allergic symptoms.

Ranitidine(C₁₃H₂₂N₄O₃S popularly known as Zantac) is used as antihistamines to suppress or to narrow the blood vessels or any of the relating effects which are caused during an allergic reaction.

Rantidine

(ii) Furacine - (d) Antiseptic

Furacine (C₆H₆N₄O₄) is another nitrogenous organic compound is used as an antiseptic. It works by killing bacteria or any other microorganisms by stopping their outgrowth. It is also used to treat infected skin burns.

Furacine

(iii) Phenelzine – (a) Tranquilizers

Tranquilizers are basically drugs which are used for treatment of anxiety, tension, fear or any disturbance of mind and helps in sleeping.

Phenelzine (C₈H₁₂N₂) or Nardil is therefore an antidepressant or a tranquilizer as it helps in restoring the balance of neurotransmitters in our brain.

(iv) Chloramphenicol – (b) Antibiotic

Antibiotics are powerful medicines which are used to kill bacteria or inhibit their growth. Thus they help in fighting bacterial infections.

Chloramphenicol (C₁₁H₁₂Cl₂N₂O₅) is also an antibiotic used for the treatment of bacterial infections. It is used in the alternative treatment of meningitis, typhoid, dysentery, pneumonia. Along with that it is also used as an eye ointment for conjunctivitis.

Chloramphenicol