Advertisements
Advertisements
Question
Arrange water, ethanol and phenol in increasing order of acidity and give reason for your answer.
Advertisements
Solution
The increasing order of acidity is ethanol < water < phenol. The phenoxide ion obtained after the removal of a proton is stabilised by resonance whereas the ethoxide ion obtained after the removal of a proton is destabilised by the ‘+I’ effect of the —C2H5 group. Therefore phenol is a stronger acid than ethanol. On the other hand, ethanol is a weaker acid than water because the electron-releasing —C2H5 group in ethanol increases the electron density on oxygen and hence the polarity of the O—H bond in ethanol decreases which results in the decreasing acidic strength. Hence acidic strength increases in the order given above.
APPEARS IN
RELATED QUESTIONS
How do you convert the following:
Ethanol to Propan-2-ol
Write the mechanism of the following reaction :
\[\ce{C2H5OH->[H2SO4][443K]CH2=CH2 + H2O}\]
Give simple chemical test to distinguish between Ethanol and Phenol.
Methanol and ethanol are miscible in water due to ____________.
Which of the following is correct?
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.
\[\begin{array}{cc}
\phantom{.}\ce{CH3 - CH - CH - CH - CH - CH3}\phantom{}\\
\phantom{......}|\phantom{......}|\phantom{......}|\phantom{.....}|\phantom{........}\\
\phantom{...}\ce{CH3}\phantom{...}\ce{OH}\phantom{...}\ce{C2H5}\phantom{.}\ce{OH}\phantom{...}\end{array}\]
Out of 2-chloroethanol and ethanol which is more acidic and why?
Suggest a reagent for conversion of ethanol to ethanal.
Suggest a reagent for conversion of ethanol to ethanoic acid.
Arrange the following compounds in increasing order of acidity and give a suitable explanation.
Phenol, o-nitrophenol, o-cresol
Dipole moment of phenol is smaller than that of methanol. Why?
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 |
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 |
Assertion: Ethanol is a weaker acid than phenol.
Reason: Sodium ethoxide may be prepared by the reaction of ethanol with aqueous \[\ce{NaOH}\].
Convert the following:
Propanenitrile to ethanol.
How methanol is obtained from methanal.
