$\beta$-carotene is responsible for the orange colour of carrots.
$\beta$-carotene is oxidised by hot, concentrated, acidified KMnO$_4$.
When an individual molecule of $\beta$-carotene is oxidised in this way, many product molecules are formed.
How many of these product molecules contain a ketone functional group?

1 )
4
6
3 )
9
4 )
11
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