Gamaxine insecticide is based on

Correct option is B

The correct answer is (b) benzene hexachloride

Explanation:
• The potent agricultural insecticide marketed under trade names like Gammexane (or lindane) is chemically based on benzene hexachloride (BHC).
• Its strict IUPAC name is 1,2,3,4,5,6-hexachlorocyclohexane.
• Specifically, it is the gamma-isomer of BHC that possesses the intense insecticidal properties used universally to combat pests.

Information Booster:
• Lindane (the gamma isomer) has been widely banned in many countries due to its severe toxicity, persistence in the environment, and tendency to bioaccumulate.
• BHC is synthesized by treating benzene with chlorine gas strictly in the presence of bright sunlight or UV light.

Additional Knowledge:
DDT (Option a)
• Dichloro-diphenyl-trichloroethane is another infamous historical insecticide, structurally unrelated to the cyclic BHC structure.
hexachlorobenzene (Option c)
• HCB is a completely different aromatic compound (C6Cl6) formerly used strictly as a fungicide for seed treatment.
chloral (Option d)
• Trichloroacetaldehyde is a precursor primarily used in the synthesis of DDT, not Gammexane.
None of the above/More than one of the above (Option e)
• Incorrect, as BHC accurately identifies the base compound.

So the correct answer is (b)