Question:
Which of the following is Non-ester Pyrethroid?
Which of the following is Non-ester Pyrethroid?
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Etofenprox is widely used in mosquito control programs due to its low mammalian toxicity.
Updated On: Jul 2, 2026
- Etofenprox
- Allethrin
- Cypermethrin
- Deltamethrin
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The Correct Option is A
Approach Solution - 1
Pyrethroid classification:
Etofenprox:
Ether pyrethroid (no ester bond)
More photostable
Ester pyrethroids:
Allethrin, Cypermethrin, Deltamethrin
Contain ester functional group
Etofenprox:
Ether pyrethroid (no ester bond)
More photostable
Ester pyrethroids:
Allethrin, Cypermethrin, Deltamethrin
Contain ester functional group
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Approach Solution -2
Elimination by chemical naming pattern:
All the standard ester-type pyrethroids are named with the suffix "-thrin" because they are esters of chrysanthemic or related acids with an alcohol component, Allethrin, Cypermethrin and Deltamethrin all follow this pattern and each contains a true ester (-COO-) linkage.
Etofenprox breaks this naming convention, it is a third-generation pyrethroid mimic built around a diphenyl ether skeleton with only an ether linkage, deliberately designed to resist esterase-based detoxification in insects.
Since Etofenprox is the only compound without an ester bond, it is the Non-ester Pyrethroid.
All the standard ester-type pyrethroids are named with the suffix "-thrin" because they are esters of chrysanthemic or related acids with an alcohol component, Allethrin, Cypermethrin and Deltamethrin all follow this pattern and each contains a true ester (-COO-) linkage.
Etofenprox breaks this naming convention, it is a third-generation pyrethroid mimic built around a diphenyl ether skeleton with only an ether linkage, deliberately designed to resist esterase-based detoxification in insects.
Since Etofenprox is the only compound without an ester bond, it is the Non-ester Pyrethroid.
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