JEE Chemistry 2023 Question with Solution

Given: We need to count the molecules that give the haloform test.

Find: The number of molecules having the required functional group.

The haloform test is used to identify compounds containing a methyl ketone group $-COCH_3$ or a similar structure.

Molecules having

give positive haloform test.

So,

give haloform test.

Therefore, the number of molecules giving a positive haloform test is $3$.

Given: Haloform test is positive for compounds that contain a methyl group directly attached to a carbonyl group, that is $\text{CH}_3\text{-CO-}$, or related structures that are converted into it.

Find: How many of the given molecules satisfy this condition.

Looking at the structures:

• The molecules containing the required methyl ketone type arrangement give a positive haloform test.
• The molecule with a secondary alcohol of the type oxidizable to a methyl ketone also gives a positive haloform test.
• The other molecules do not meet the criterion.

Thus, the number of molecules giving a positive haloform test is $3$.