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प्रश्न
Arrange water, ethanol and phenol in increasing order of acidity and give reason for your answer.
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उत्तर
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.
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संबंधित प्रश्न
Write resonance structures of aniline. What is the action of benzene diazonium chloride on ethanol?
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.
Among the following the one which reacts most readily with ethanol is:
Methanol and ethanol are miscible in water due to ____________.
Which of the following is correct?
Wood spirit is known as acetone:
Phenol is less acidic than ______.
Write the IUPAC name of the following compound.
\[\begin{array}{cc}
\phantom{.}\ce{CH3 - CH - CH - CH - CH - CH3}\phantom{}\\
\phantom{......}|\phantom{......}|\phantom{......}|\phantom{.....}|\phantom{........}\\
\phantom{...}\ce{CH3}\phantom{...}\ce{OH}\phantom{...}\ce{C2H5}\phantom{.}\ce{OH}\phantom{...}\end{array}\]
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) | 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 \[\ce{NaOH}\].
Alcoholic fermentation is brought about by the action of
Write chemical reactions of following reagents on methoxyethane:
dilute H2SO4
How methanol is obtained from methanal.
Give IUPAC names of the following compounds:
\[\begin{array}{cc}
\ce{CH3 - CH - CH - CH - CH2-OH }\\
|\phantom{......}|\phantom{......}|\phantom{.......}\\
\ce{Cl}\phantom{....}\ce{CH3}\phantom{...}\ce{CH3}\phantom{.....}
\end{array}\]
