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Assertion: Dipolemoment ofphenol is smal...

Assertion: Dipolemoment ofphenol is smaller than that of methanol.
Reason: In phenol C-O bond is less polar due to electron withdrawing effect of the benzene ring whereas in methanol, C-O bond Is more polar due to electron releasing effect of `CH_3` group.

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Paragraph Carboxylic acids are distinctly acidic because they ionize in water to give hydronium ions: RCOOH+H_(2)O hArr RCOO^(-) +H_(3)O^(+) The acidic strength depends upon the extent of ionizations of the acid and the stability of the anion formed. The acidic strength can also be expressed in terms of dissociation constant K_(a) or pK_(a) which are related as pK_(a)= -log K_(a) . Most unsubstituted carboxylic acids have K_(a) values in the range of 10^(-4) to 10^(-5) (pK_(a) =4-5) . The substitutents have marked effect on the acidic strength of carboxylic acids. Any group that stabilizes the carboxylate ion more than the carboxylic acid group will increase the acidic strength, and the group which destabilizes the carboxylate group more than the carboxylic acid group will decrease the acidic strength. In a similar manner, the electron-releasing groups makes benzoic acid weaker, while the electron-withdrawing groups make benzoic acid stronger. The ortho isomer of every substituted benzoic acid (whether electron releasing or electron withdrawing) is the strongest among the three isomers due to ortho effect. Which of the following is the weakest acid?

BRILLIANT PUBLICATION-ALCOHOL, PHENOL & ETHER -LEVEL II (ASSERTION - REASON TYPE)
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  2. Assertion : In alcohols, the boiling point decreases with decrease in...

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  3. Assertion : Alcohols and water are weaker acids than phenols. Reas...

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  4. Assertion : Bromination of phenol takes place even in the absence of...

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  5. Assertion : The cleavage of C-O bond in ethers takes place under dra...

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  6. Assertion: Dipolemoment ofphenol is smaller than that of methanol. R...

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  7. Assertion: Neopentyl alcohol on treatment with HCl gives neopentyl chl...

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  8. Assertion: Phenoxide ion on treatment with an active alkyl h...

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  9. Assertion:Phenol forms 2,4,6-tribromophenol on treatment with Br2 in c...

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  10. Assertion: Alcohols have higher boiling points than ethers of comparab...

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  11. Assertion: Commercially carboxylic acids are reduced to alcohols by co...

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  12. Assertion: Ethers are not prepared by the dehydration of secondary and...

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  13. Assertion: CO2 is non polar, while ROR is polar in nature. Reason: ...

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  14. Assertion: t-Butyl methyl ether is not prepared by the reaction of t-b...

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  15. Assertion: Anisole undergoes electrophilic substitution at o-and p-pos...

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  16. Assertion: Acid catalysed dehydration of tert-butanol proceeds faster ...

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  17. Assertion: Reaction of alcohols with SOCl2 is catalysed by the presenc...

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  18. Assertion: Solubility of n-alcohl in water decreases with increase in ...

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  19. Assertion: The bond angle in alcohols is slightly less than the tetr...

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  20. Assertion: Addition reaction of water to but-1-ene in acidic medium yi...

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