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JEE Main levelSingle correct optionDifficulty 2 of 3st014

Butan-2-one oxime, $CH X_{3} CH X_{2} - C (CH X_{3}) = N - OH$ , is drawn with the $OH$ group on the same side of the $C = N$ bond as the ethyl group. Its CIP descriptor is

A $R$
B $Z$
Cnone, because the nitrogen has no second substituent to compare
D $E$

Answer: B

On carbon, ethyl

(C, H, H)

outranks methyl

(H, H, H)

. On nitrogen,

OH

outranks the lone pair (treated as lowest priority). The

OH

and the ethyl group are on the same side, so the descriptor is

Z

.

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