MolSynapsequestion bank

MolSynapse / Question bank / Haloalkanes and Haloarenes / Polyhalogen compounds

JEE Main levelSingle correct optionDifficulty 2 of 3hx189

Which of the following does NOT give a yellow precipitate when warmed with $I X_{2}$ and aqueous $NaOH$ ?

Aethanol
Bacetophenone, $C X_{6} H X_{5} - CO - CH X_{3}$
Cpropan-2-ol
Dpentan-3-ol, $CH X_{3} CH X_{2} CH (OH) CH X_{2} CH X_{3}$

Answer: D

The iodoform test needs a

CH X_{3} - CO X^{-}

group or a

CH X_{3} - CH (OH) X^{-}

group (oxidised in situ). Ethanol, propan-2-ol and acetophenone qualify. Pentan-3-ol has no methyl on the carbinol carbon, so it does not.

Practice Haloalkanes and Haloarenes More on Polyhalogen compounds

Previous questionNext question

More questions on Polyhalogen compounds