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Chemistry · 2024 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids3 marksApplyshort answer
CBSE 2024 · Region 4 · Set 1 · Q25
(a) Give chemical tests to distinguish between the following pairs of compounds: (i) Phenol and Benzoic acid (ii) Propanal and Propanone (b) Which…
(a)
Give chemical tests to distinguish between the following pairs of compounds :
(i)
Phenol and Benzoic acid
(ii)
Propanal and Propanone
(b)
Which one of the given compounds is a stronger acid and why ? $\displaystyle \mathrm{CH}_{2} \mathrm{FCH}_{2} \mathrm{CH}_{2} \mathrm{COOH}$ or $\displaystyle \mathrm{CH}_{3} \mathrm{CHFCH}_{2} \mathrm{COOH}$ $\displaystyle 2+1$
Marking-scheme solution
(a)(i)
On adding neutral \(\displaystyle \mathrm{FeCl}_{3}\), phenol gives violet colouration whereasbenzoic acid does not give violet colour.
(ii)
On adding Tollens reagent, propanal gives silver mirror whereas propanone does not. .
(b)
\(\displaystyle \mathrm{CH}_{3} \mathrm{CHF} \mathrm{CH}_{2} \mathrm{COOH}\); due to stronger - I effect or electron withdrawing nature of F, as F is closer to the carboxyl group.
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