Question
Explain haloform reaction.
✓
Answer
A ketone containing $COCH_3$ group is oxidised by sodium hypohalite a mixture of $($sodium hydroxide and halogen$)$ results in the formation of sodium salt of carboxylic acid having one carbon atom less than that of ketone and methyl group is converted to haloform.
Acetaldehyde is the only aldehyde which gives haloform reaction. In this reaction, $R$ may be hydrogen, methyl group or aryl group and $X$ may $be , Cl, Br$ or $I.$ The reaction is given by all methyl ketones $(CH_3 – CO – R)$ and all alcohols containing $CH_3 – (CHOH)$ group.
When a methyl ketone is warmed with iodine and sodium hydroxide, a yellow precipitate of iodoform is obtained. The iodoform reaction is used as a qualitative test for detection of $CH_3CO-$group in a organic compound.
Acetaldehyde is the only aldehyde which gives haloform reaction. In this reaction, $R$ may be hydrogen, methyl group or aryl group and $X$ may $be , Cl, Br$ or $I.$ The reaction is given by all methyl ketones $(CH_3 – CO – R)$ and all alcohols containing $CH_3 – (CHOH)$ group.
When a methyl ketone is warmed with iodine and sodium hydroxide, a yellow precipitate of iodoform is obtained. The iodoform reaction is used as a qualitative test for detection of $CH_3CO-$group in a organic compound.
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
Explain electrochemical series or electromotive series.
How is dioxygen prepared in laboratory from $KClO_3?$
→What current strength in amperes will be required to produce 2.4 g of Cu from $CuSO _4$ solution in 1 hour ? Molar mass of $Cu =63.5 g mol ^{-1}$.
→Define the Extensive properties.
What is effect of temperature on solubility of solids in water? Give examples.
What are amines? How are they classified?
What is the nature of the following oxides:
(i) $N _2 O _{ s }$
(ii) $P _4 O _{10}$
(iii) $Cl _2 O _7$
(iv) $ZnO$
(v) $Al _2 O _3$
(vi) $K _2 O$
(vii) $BaO$
(viii) $CO$
(ix) $N _2 O$ ?
→(i) $N _2 O _{ s }$
(ii) $P _4 O _{10}$
(iii) $Cl _2 O _7$
(iv) $ZnO$
(v) $Al _2 O _3$
(vi) $K _2 O$
(vii) $BaO$
(viii) $CO$
(ix) $N _2 O$ ?
Define the Enthalpy of ionisation.
Calculate the mass of a nonvolatile solute (molar mass $40 \times 10^{-3} kg / mol$ ) which is dissolved in $114 \times 10^{-3} kg$ octane to reduce its vapour pressure to $80 \%$.
→Explain the structure of carbonyl functional group.