Which of the following alkenes, on reductive ozonolysis, give at least one product that responds to the iodoform test?

A $CH X_{2} = CH - CH X_{2} CH X_{2} CH X_{3}$
B $CH X_{3} CH X_{2} - CH = CH - CH X_{2} CH X_{3}$
C $CH X_{3} - CH = CH - CH X_{3}$
D $(CH X_{3}) X_{2} C = CH X_{2}$

Answer: C, D

The iodoform test needs

CH X_{3} - CO X^{-}

CH X_{3} - CH (OH) X^{-}

. But-2-ene gives ethanal and 2-methylpropene gives propanone, both positive. Pent-1-ene gives butanal and methanal, and hex-3-ene gives propanal. None of these has a

CH X_{3} CO

group.

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