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An alkene on ozonolysis gives methanal as one of the product. Its structure is
ChemistryHydrocarbonsNEETNEET 2020 (Phase 1)
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Ozone is a very reactive allotrope of oxygen. The reaction of ozone with alkenes and alkynes causes the oxidative cleaving of the alkene or alkyne. The carbon-carbon triple bonds are replaced with carbon-oxygen double bonds, giving the required carbonyl product as shown below.

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