Question

The number of molecules which gives haloform test among the following molecules is

Hint:

The halform test is used to identify compounds containing a methyl ketone group (\( -COCH_3 \)) or a similar structure.

Answer 1

Correct Answer: 3

The haloform test is used to identify methyl ketones (CH₃CO-) or compounds that can be oxidized to methyl ketones. It is positive for compounds like acetone and acetaldehyde, involving the formation of a trihalomethane, typically iodoform (CHI₃).

Let's analyze each molecule:

1. Acetophenone (C₈H₈O): Contains a methyl ketone group (CH₃CO-), so it gives a positive haloform test.
2. Ethyl acetoacetate (CH₃COCH₂COOC₂H₅): Contains a methyl ketone structure, thus it gives a positive haloform test.
3. Acetaldehyde (C₂H₄O): Simples aldehyde but can be oxidized to form a methyl ketone, so it gives a positive result.
4. Phenol and other alcohols without the appropriate structure do not give a positive result.

Considering the above explanations, the haloform test is positive for acetophenone, ethyl acetoacetate, and acetaldehyde, thus the number of molecules is 3.

Therefore, the solution is within the provided range of 3 to 3. Hence, the final answer is: 3.