On reductive ozonolysis, which alkenes give propanone as one of the products?

Abut-2-ene
B2-methylbut-1-ene
C2-methylbut-2-ene
D2-methylpropene

Answer: C, D

Propanone needs a

(CH X_{3}) X_{2} C =

unit. 2-Methylbut-2-ene gives propanone and ethanal; 2-methylpropene gives propanone and methanal. But-2-ene gives only ethanal. 2-Methylbut-1-ene gives butanone and methanal.

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