Concept:Chemicals are grouped as fine chemicals or heavy chemicals according to their purity, scale of production, and use.
Explanation:Fine chemicals are pure, single substances produced in limited quantities, usually for specific industrial or laboratory purposes.
Heavy chemicals are produced and handled in large amounts, and they are often relatively crude or technical in quality.
Sodium hydroxide,
NaOH, hydrochloric acid,
HCl, and ammonia,
NH3, are all examples of heavy chemicals.
Among the options, ethylene,
C2H4, is the example that fits the classification of a fine chemical.
Answer:Ethylene (Option C).