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JEE CHEMISTRY MCQ: ALDEHYDES & KETONES & CARBOXYLIC ACIDS
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Assertion (A) : The molecular mass of acetic acid in benzene is 120 instead of 60.
Reason (R) : The carboxylic acids exist as cyclic dimers in which the two molecules of the acid are held together by two strong hydrogen bonds.
Reason (R) : The carboxylic acids exist as cyclic dimers in which the two molecules of the acid are held together by two strong hydrogen bonds.
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Correct option: A
Assertion is correct, reason is correct; reason is a correct explanation for assertion.
Option A is correct because acetic acid forms dimers in benzene through hydrogen bonding, effectively doubling its molecular weight.
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By passing water gas through an electric discharge at low pressure, we get:
Addition of alcohols to aldehydes and ketones takes place in presence of dry gas because it
(i) Protonates the oxygen of the carbonyl compounds
(ii) Increases the electrophilicity of the carbonyl carbon
(iii) Removes the excess moisture from the reaction
(iv) Helps the reaction to move in the forward direction Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as Which one of the following reactions is a condensation reaction? Carboxylic acids dimerise due to The number of aldehyde isomers for will be
(i) Protonates the oxygen of the carbonyl compounds
(ii) Increases the electrophilicity of the carbonyl carbon
(iii) Removes the excess moisture from the reaction
(iv) Helps the reaction to move in the forward direction Benzyl alcohol and sodium benzoate is obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as Which one of the following reactions is a condensation reaction? Carboxylic acids dimerise due to The number of aldehyde isomers for will be