Looking for classes? Ksquare Career Institute, Bengaluru →
Haloform reaction
Concepts tested here
- Iodoform test
All Questions
2010 AIPMT-MAINS 1 question
-
Following compounds are given
a. $CH_3CH_2OH$
b. $CH_3COCH_3$
c. $CH_3CH(OH)CH_3$
d. $CH_3OH$
Which of the above compound(s), on being warmed with iodine solution and NaOH, will give iodoform?The iodoform test (yellow precipitate of $CHI_3$ with $I_2$/NaOH) is given by compounds containing the $CH_3CO-$ group, and by alcohols containing the $CH_3CH(OH)-$ group, which are oxidised to $CH_3CO-$ by NaOI.
a. $CH_3CH_2OH$ has $CH_3CH(OH)-$ (with H); it is oxidised to $CH_3CHO$ and gives iodoform.
b. $CH_3COCH_3$ has the $CH_3CO-$ group; it gives iodoform.
c. $CH_3CH(OH)CH_3$ has the $CH_3CH(OH)-$ group; it is oxidised to acetone and gives iodoform.
d. $CH_3OH$ has neither group; it does not give iodoform.
Hence a, b and c give iodoform.