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Chemistry · 2022 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsMethods of Preparation of Carboxylic Acids3 marksApplyshort answer
CBSE 2022 · Region 5 · Set 1 · Q11
(a) Complete the following: (i) CH_3 CN →[ 2. H_2 O ] 1. A 1 H ( i - Bu )_2^′ A^′ →[ H^+] H_2 N - OH 'B' (ii) Write IUPAC name of the following…
Complete the following:
(i)
$\displaystyle \mathrm{CH}_{3} \mathrm{CN} \xrightarrow[\text { 2. } \mathrm{H}_{2} \mathrm{O}]{\text { 1. } \mathrm{A} 1 \mathrm{H}(\mathrm{i}-\mathrm{Bu})_{2}}{ }^{\prime} \mathrm{A}^{\prime} \xrightarrow[\mathrm{H}^{+}]{\mathrm{H}_{2} \mathrm{~N}-\mathrm{OH}}$ 'B'
(ii)
Write IUPAC name of the following compound:
(iii)
Write chemical test to distinguish between the following compounds : Phenol and Benzoic acid
Convert the following :
(i)
Benzoic acid to Benzaldehyde
(ii)
Propan-$\displaystyle 1$-ol to $\displaystyle 2$-Bromopropanoic acid
(iii)
Acetaldehyde to But-$\displaystyle 2$-enal
Marking-scheme solution
(a) (i) $\displaystyle \mathrm{CH}_3\mathrm{CHO}$ /
(ii) $\displaystyle 3$-Bromobenzaldehyde / $\displaystyle 3$-Bromobenzene carbaldehyde
(iii) Benzoic acid gives brisk effervescence liberating carbon dioxide on reaction with sodium hydrogen carbonate while phenol does not. / In terms of chemical reaction mentioning brisk effervescence.
(b)
$\displaystyle \xrightarrow{\mathrm{SOCl}_2}$ $\displaystyle \xrightarrow[\mathrm{Pd-BaSO_4}]{\mathrm{H}_2}$
(ii)
$\displaystyle \mathrm{CH_3CH_2CH_2OH} \xrightarrow[\text{2. } \mathrm{H_3O^+}]{\text{1. Alk. } \mathrm{KMnO_4}} \mathrm{CH_3CH_2COOH} \xrightarrow[\text{(ii) } \mathrm{H_2O}]{\text{(i) } \mathrm{Br_2}/\text{Red P}} \mathrm{CH_3-\underset{\overset{\textstyle|}{\textstyle\mathrm{Br}}}{CH}-COOH}$
(iii)
$\displaystyle \mathrm{CH_3-\overset{\displaystyle O}{\overset{\displaystyle\|}{C}}-H} \xrightarrow{\mathrm{NaOH}} \mathrm{CH_3-\underset{\overset{\textstyle|}{\textstyle\mathrm{OH}}}{CH}-CH_2-\overset{\displaystyle O}{\overset{\displaystyle\|}{C}}-H} \xrightarrow{\text{heat}} \mathrm{CH_3-CH{=}CH-\overset{\displaystyle O}{\overset{\displaystyle\|}{C}}-H}$
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.