Question
Write a note on Haloform reaction.
✓
Answer
- This reaction is given by acetaldehyde, all methyl ketones $(CH_3–CO–R),$ and all alcohols containing $CH_3(CHOH)–$ group.
- When an alcohol or methyl ketone is warmed with sodium hydroxide and iodine, a yellow precipitate is formed. Here the reagent sodium hypoiodite is produced in situ.
- During the reaction, the sodium salt of the carboxylic acid is formed which contains one carbon atom less than the substrate.
- The methyl group is converted into haloform $(CHX_3).$
e.g. Acetone is oxidized by sodium hypoiodite to give sodium salt of acetic acid and yellow precipitate of iodoform.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Define: (a) Osmosis (b) Freezing point.
Write Nerst equation. What part of it represents the correction factor for nonstandard state conditions ?
Write the structures of $\alpha-D-(+)$-glucopyranose and $\beta-D-(+)$ glucopyranose.
→Draw the resonance structures of aromatic ethers.
Explain the preparation of glucose from sucrose
How much quantity of electricity in coulomb is required to deposit $1.346 \times 10^{-3} kg$ of $Ag$ in 3.5 minutes from $AgNO _3$ solution?
(Given : Molar mass of $Ag$ is $108 \times 10^{-3} kg mol ^{-1}$ )
→(Given : Molar mass of $Ag$ is $108 \times 10^{-3} kg mol ^{-1}$ )
The solubility of silver chloride is $1.562 \times 10^{-10} mol dm ^{-3}$ at $298 K$. Find its solubility in $g dm ^{-3}$ at the same temperature.
→Show that time required for $99.9\%$ completion of a first order reaction is three times the time required for $90\%$ completion.
→Calculate total moles after dissociation in $0.1\ M KCl$ solution and $0.05\ M$ aluminium sulphate solution. Hence, decide which of the two solutions will have higher freezing point depression.
→Benzaldehyde from benzene (Gattermann-Koch synthesis).###Write chemical equation for Gatter- mann-Koch formylation.