Question

Which of the following compound(s) will give positive haloform test?

• A. 2-Pentanone
• B. Ethanol
• C. 2-Hexanone
• D. All of the above

Answer 1

The correct option is D All of the above

All ketones and aldehydes that has $C{H}_{3}CO$ group will answer haloform test.
(a) 2-Pentanone
($C{H}_{3}C{H}_{2}C{H}_2\stackrel{\stackrel{O}{||}}{C}C{H}_3$)
(b)
Ethanol under the reaction condition is oxidised to acetaldehyde ($C{H}_{3}CHO$ )and hence it shows haloform test.
(c) 2-hexanone
($C{H}_{3}C{H}_{2}C{H}_{2}C{H}_2\stackrel{\stackrel{O}{||}}{C}C{H}_3$).
As all the above structures contain $C{H}_{3}CO$ group, they will give positive haloform test.