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(B) Ozonolysis of alkenes involves the cleavage of the $C=C$ double bond to form carbonyl compounds.For $but-2-ene$ $(CH_3-CH=CH-CH_3)$,the reaction w

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but$-2-$ene

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(B) Ozonolysis of alkenes involves the cleavage of the $C=C$ double bond to form carbonyl compounds.For $but-2-ene$ $(CH_3-CH=CH-CH_3)$,the reaction with $O_3$ followed by $Zn/H_2O$ proceeds as follows:$CH_3-CH=CH-CH_3 + O_3 \rightarrow CH_3-CH(O_2)CH-CH_3$ (ozonide intermediate)$CH_3-CH(O_2)CH-CH_3 + Zn/H_2O \rightarrow 2CH_3CHO$ (acetaldehyde or ethanal).Thus,$but-2-ene$ yields two molecules of acetaldehyde.

Ozonolysis of which one of the following will give two molecules of acetaldehyde?

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