Question

The reaction CH₃-CHO + H₂NOH gives an oxime and H₂O. This reaction is an example of a/an:

• A. Addition reaction
• B. Condensation reaction
• C. Oxidation reaction
• D. Elimination reaction

Hint:

Check whether water is lost as the aldehyde and hydroxylamine combine.

Answer 1

The Correct Option is B

Think about what defines each type of reaction listed here. A pure addition reaction only combines reactants without losing any atoms. An elimination reaction removes atoms from a single molecule to create a double bond. An oxidation reaction increases the oxidation state of carbon, for example converting an aldehyde into a carboxylic acid.

In this case, CH3-CHO and H2NOH combine, and at the same time a molecule of water is released to give the oxime CH3-CH=N-OH.

Because two separate molecules unite and a small molecule, water, is lost in the process, this matches the exact definition of a condensation reaction. It cannot be simple addition since a byproduct is released, it cannot be elimination since two starting molecules are involved rather than just one, and it is not oxidation since the overall oxidation number of the carbonyl carbon does not increase.

So the reaction is correctly classified as a condensation reaction, option B.