Question

Identify (A) in the following reaction sequence:

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Positive Iodoform Test: A "positive iodoform test" is given by compounds having a CH₃CO group in their structure.

1. When iodine and sodium hydroxide is added to a compound that contains either a methyl ketone or secondary alcohol with a methyl group at the alpha position, a pale-yellow precipitate of iodoform is formed.
2. The (A) is a methyl ketone, which gives a positive iodoform test.
3. The reaction is given below:

The explanation for incorrect options

(A) -

Does not give a positive iodoform test,

(C)

Does not give a positive iodoform test,

(D)

Does not give a positive iodoform test,

Hence option (B) is the correct answer.