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Standard XII
Chemistry
Physical Properties of Aldehydes and Ketones
Question

Give reasons:
The $$\alpha$$- hydrogen atoms of aldehydes and ketones are acidic in nature.

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Solution
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The acidity of $$\alpha$$- hydrogen atom of carbonyl carbon is due to the strong withdrawing effect of the carbonyl group and resonance stabilisation of the conjugate base.

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Similar Questions
Q1
Give reasons:
The $$\alpha$$- hydrogen atoms of aldehydes and ketones are acidic in nature.
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Q2
Reason
The anion left after the removal of $$ \alpha$$-hydrogen is stabilized by inductive effect.
Assertion
$$ \alpha$$-Hydrogen atoms in aldehydes and ketones are acidic.
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Q3
Give reasons in one or two sentences for the following:
'Hydrazones of aldehydes and ketones are not prepared in highly acidic medium'.
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Q4
Give reasons:-
(a) HCHO is more reactive than CH3−CHO towards addition of HCN.
(b) pKa of O2N−CH2−COOH is lower than that of CH3COOH
(c) Alpha hydrogens of aldehydes and ketones is acidic in nature.
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Q5
The carbon atom in carbonyl group is ______ hybridised. The carbonyl group in aldehydes and ketones undergoes ______ reactions. Aldehydes which have α- H atom undergo ______ reaction while aldehydes which have no α-H atom undergo _______ reaction.
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