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Chemistry · 2023 · 5 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids5 marksApplylong answer
CBSE 2023 · Region 4 · Set 3 · Q34
(a) Draw structure of the 2,4-dinitrophenylhydrazone of benzaldehyde. (b) Which acid of the following pair is a stronger acid? or (c) Write the…
(a)
Draw structure of the $\displaystyle 2,4$-dinitrophenylhydrazone of benzaldehyde.
(b)
Which acid of the following pair is a stronger acid ?
or
(c) Write the chemical equation involved in Rosenmund's reduction.
(d)
Why are $\displaystyle \alpha$-hydrogen atoms of aldehydes and ketones acidic in nature?
(e)
Write a chemical test to distinguish between Benzaldehyde and Benzoic acid.
Marking-scheme solution
(a) 
(b) 
(c)
(d) Due to resonance stabilization of conjugate base enolate ion.
(e) On adding \(\displaystyle \mathrm{NaHCO}_{3}\) solution, Benzoic acid gives effervescence of \(\displaystyle \mathrm{CO}_{2}\) whereas Benzaldehyde does not.
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