Ozonolysis, alkenes vs alkynes

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lex1489

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Why is it that ozonolysis cleaves and oxidizes alkenes to aldehydes, but it cleaves and oxidizes alkynes to carboxylic acids? This is according to KBB.

For alkenes it uses O3/CH2Cl2 then Zn/H2O, and for alkynes it uses O3/CCl4 then H2O.

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