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?

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.

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Rohit is studying the iodoform reaction by using the following compounds: (P) CH3OH (Q) CH3CHO (R) CH3COCH3 (S) CH3CH2−CO−CH2−CH3 - Chemistry (Theory)

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?

Options

Only (P) and (Q)
Only (Q) and (R)
Only (P) and (S)
Only (Q) and (S)

MCQ

Solution

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.