Question

The smallest ketone and its next homologue are reacted with hydroxylamine to form oxime.

• A. Two different oximes are formed
• B. Three different oximes are formed
• C. Two oximes are optically active
• D. All oximes are optically active

Answer 1

The correct option is B

Three different oximes are formed

Be alert to the possibility of cis trans isomers around the carbon nitrogen double bond!

As shown here, butan-2-one reacts with hydroxyl amine to yield two geometrical isomers, none of them optically active. Acetone forms just the one compound (there are two methyl groups attached to the carbon bearing the double bond).