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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Dipole moment of phenol is smaller than that of methanol. Why?

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प्रश्न

Dipole moment of phenol is smaller than that of methanol. Why?

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उत्तर

In phenol, C – O bond is less polar due to electron-withdrawing effect of benzene ring, whereas in methanol C – O bond is more polar due to electron releasing effect of –CH3 group. Hence, the dipole moment of phenol (1.54 D) is smaller than that of methanol (1.71 D).

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पाठ 11: Alcohols, Phenols and Ethers - Multiple Choice Questions (Type - I) [पृष्ठ १६०]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 11 Alcohols, Phenols and Ethers
Multiple Choice Questions (Type - I) | Q 49 | पृष्ठ १६०

संबंधित प्रश्‍न

How do you convert the following:

Ethanol to Propan-2-ol


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 ____________.


If ethanol dissolves in water, then which of the following would be observed:


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?


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


The carbon-oxygen bond in phenol is slightly stronger than that in 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

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

Which reagent can convert acetic acid into ethanol?


If the starting material is 1-methyl-1,2-epoxy cyclopentane, of absolute configuration, decide which one compound correctly represents the product of its reaction with sodium methoxide in methanol.


Give IUPAC names of the following compounds:

 \[\begin{array}{cc}
\ce{CH3 - CH - CH - CH - CH2-OH }\\
|\phantom{......}|\phantom{......}|\phantom{.......}\\
\ce{Cl}\phantom{....}\ce{CH3}\phantom{...}\ce{CH3}\phantom{.....}
\end{array}\]


3, 3-dimethyl-1-butene was subject to following reactions:


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