(B) The structure of the given compound is $CH_3-CO-CH(CH_3)_2$.To name it according to $IUPAC$ rules,we identify the longest carbon chain containing

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(B) The structure of the given compound is $CH_3-CO-CH(CH_3)_2$.To name it according to $IUPAC$ rules,we identify the longest carbon chain containing the ketone group.The chain has $4$ carbon atoms,so the parent alkane is butane.The ketone group is at position $2$,and there is a methyl group at position $3$.Thus,the name is $3-$methyl$-2-$butanone.