Q.1
Which of the following compounds have insect controlling properties through inhibition of chitin synthesis but does not have
benzoylphenylurea as its basic skeleton ?
- Chitin Synthesis Inhibitor (CSI) Insecticides:
- Classical benzoylphenylurea CSIs include Diflubenzuron, Novaluron, Teflubenzuron, and Triflumuron, which possess the characteristic $-CO-NH-CO-NH-$ bridge connecting two aromatic rings.
- Buprofezin (2-tert-butylimino-3-isopropyl-5-phenylperhydro-1,3,5-thiadiazin-4-one) is an insect growth regulator that inhibits chitin biosynthesis and nymphal molting in homopteran sucking pests (planthoppers, whiteflies), but belongs structurally to the thiadiazine chemical family, not the benzoylphenylurea skeleton.
- Conclusion: Buprofezin controls insects via chitin synthesis inhibition without a benzoylphenylurea skeleton (Option 4).
Correct option: (4) Buprofezin
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