Question

Rohit is studying the iodoform reaction by using the following compounds:

(P) CH₃OH

(Q) CH₃CHO

(R) CH₃COCH₃

(S) CH₃CH₂−CO−CH₂−CH₃

Which of the following combinations will give an iodoform test when the compounds are heated separately with iodine and aqueous NaOH?

विकल्प

• Only (P) and (Q)

• Only (Q) and (R)

• Only (P) and (S)

• Only (Q) and (S)

Answer 1

Only (Q) and (R)

Explanation:

The iodoform test is given by compounds containing the CH₃−CHO type (acetaldehyde) or a methyl ketone (R–CO–CH₃). Thus, (Q) CH₃CHO and (R) CH₃COCH₃ give the test, while (P) CH₃OH and (S) CH₃CH₂–CO–CH₂CH₃ do not, as they lack this group.