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प्रश्न
Match the items of column I with items of column II.
| Column I | Column II | |
| (i) | Methanol | (a) Conversion of phenol to o-hydroxysalicylic acid |
| (ii) | Kolbe’s reaction | (b) Ethyl alcohol |
| (iii) | Williamson’s synthesis | (c) Conversion of phenol to salicylaldehyde |
| (iv) | Conversion of 2° alcohol to ketone | (d) Wood spirit |
| (v) | Reimer-Tiemann reaction | (e) Heated copper at 573 K |
| (vi) | Fermentation | (f) Reaction of alkyl halide with sodium alkoxide |
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उत्तर
| Column I | Column II | |
| (i) | Methanol | (d) Wood spirit |
| (ii) | Kolbe’s reaction | (a) Conversion of phenol to o-hydroxysalicylic acid |
| (iii) | Williamson’s synthesis | (f) Reaction of alkyl halide with sodium alkoxide |
| (iv) | Conversion of 2° alcohol to ketone | (e) Heated copper at 573 K |
| (v) | Reimer-Tiemann reaction | (c) Conversion of phenol to salicylaldehyde |
| (vi) | Fermentation | (b) Ethyl alcohol |
Explanation:
(i) Methanol is also known as ‘wood spirit’ as it was produced by the destructive distillation of wood.
(ii) In Kolbe’s reaction, 2-hydroxybenzoic acid (salicylic acid) is prepared by the reaction of phenol with CO2 gas.
(iii) Williamson's synthesis is an important method for the preparation of either. In this method, an alkyl halide is allowed to react with sodium alkoxide.
\[\ce{R - X + R' - \overset{-}{\overset{\bullet\bullet}{\underset{\bullet\bullet}{O}}} \overset{+}{N}a -> R - \overset{\bullet\bullet}{\underset{\bullet\bullet}{O}} - R' + NaX}\]
(iv) When a 2° alcohol is allowed to pass overheated copper at 573 K, dehydrogenation takes place and an ketone is formed.
\[\begin{array}{cc}
\ce{R - CH - R' ->[Cu][573 K] R - C - R'}\\
|\phantom{...................}||\phantom{.}\\
\phantom{.}\ce{OH}\phantom{.................}\ce{O}\phantom{..}
\end{array}\]
(v) On treating phenol with chloroform in the presence of \[\ce{NaOH}\], an aldehydic group is introduced at ortho position of benzene ring
(vi) Ethanol is prepared by the fermentation of sugars.
\[\ce{C12H22O11 + H2O ->[Invertase] C6H12O6 + C6H12O6}\]
\[\ce{C6H12O6 ->[Zymase] 2C2H5OH + 2CO2}\]
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संबंधित प्रश्न
Write resonance structures of aniline. What is the action of benzene diazonium chloride on ethanol?
Write the mechanism of the following reaction :
\[\ce{C2H5OH->[H2SO4][443K]CH2=CH2 + H2O}\]
Give simple chemical test to distinguish between Ethanol and Phenol.
Among the following the one which reacts most readily with ethanol is:
Phenol is less acidic than ______.
Phenol can be distinguished from ethanol by the reactions with:
(i) \[\ce{Br2/water}\]
(ii) \[\ce{Na}\]
(iii) Neutral \[\ce{FeCl3}\]
(iv) All the above
Write the IUPAC name of the following compound.
\[\begin{array}{cc}
\phantom{.}\ce{CH3 - CH - CH - CH - CH - CH3}\phantom{}\\
\phantom{......}|\phantom{......}|\phantom{......}|\phantom{.....}|\phantom{........}\\
\phantom{...}\ce{CH3}\phantom{...}\ce{OH}\phantom{...}\ce{C2H5}\phantom{.}\ce{OH}\phantom{...}\end{array}\]
What is denatured alcohol?
Out of 2-chloroethanol and ethanol which is more acidic and why?
Suggest a reagent for conversion of ethanol to ethanal.
Arrange the following compounds in increasing order of acidity and give a suitable explanation.
Phenol, o-nitrophenol, o-cresol
Name the enzymes and write the reactions involved in the preparation of ethanol from sucrose by fermentation.
Dipole moment of phenol is smaller than that of methanol. Why?
Arrange water, ethanol and phenol in increasing order of acidity and give reason for your answer.
Match the items of column I with items of column II.
| Column I | Column II | |
| (i) | Antifreeze used in car engine | (a) Neutral ferric chloride |
| (ii) | Solvent used in perfumes | (b) Glycerol |
| (iii) | Starting material for picric acid | (c) Methanol |
| (iv) | Wood spirit | (d) Phenol |
| (v) | Reagent used for detection of phenolic group | (e) Ethleneglycol |
| (vi) | By product of soap industry used in cosmetics | (f) Ethanol |
Assertion: Ethanol is a weaker acid than phenol.
Reason: Sodium ethoxide may be prepared by the reaction of ethanol with aqueous \[\ce{NaOH}\].
Which of the following is known as wood spirit?
How methanol is obtained from methanal.
