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Question

(A) In the structure $CH_3-C(=O)-CH(CH_3)-CH_3$,the principal functional group (ketone) should get the lowest possible number. Numbering from the left

Vedclass · Accepted Answer

$CH_3-C(=O)-CH(CH_3)-CH_3$ $2-$methyl$-3-$butanone

Vedclass · Answer

(A) In the structure $CH_3-C(=O)-CH(CH_3)-CH_3$,the principal functional group (ketone) should get the lowest possible number. Numbering from the left,the ketone is at $C2$ and the methyl group is at $C3$. Thus,the correct $IUPAC$ name is $3-$methyl$-2-$butanone. $(d)$ In $CH_3-CH(Cl)-CH(Br)-CH_3$,the alphabetical order should be followed for substituents. $B$ (bromo) comes before $C$ (chloro). Thus,the correct $IUPAC$ name is $2-$bromo$-3-$chlorobutane.

The incorrect $IUPAC$ name is

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