Let us discuss about penicillin and reach the conclusion

Following are some point about penicillin: -

• It is an antibacterial fungus.

• Ampicillin and Amoxycillin are synthetic modifications of penicillin.

• It has bactericidal effect. {Bactericidal effect means bacteria is being is killed because of the antibiotic}

• It comes under narrow spectrum antibiotic. {The full range of micro-organisms attacked by an antibiotic is called its spectrum. Broad spectrum antibiotics are medicines effective against several different types of harmful micro-organisms. For example, tetracycline, chloramphenicol, etc.}

Hence, from the above points it can be concluded that options (i), (ii) and are correct. Options (iii) and (iv) are incorrect.