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Chemistry · 2022 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids3 marksApplyshort answer
CBSE 2022 · Region 2 · Set 3 · Q4
(a) Predict the products in the following reactions: (i) CH_3MgBr + CO_2 → H_3O^+ (ii) CH_3CN →[ (b) H_2O ] (a) DIBAL-H OR (b) Arrange the following…
(a)
Predict the products in the following reactions :
(i)
$\displaystyle \mathrm{CH_3MgBr} + \mathrm{CO_2} \xrightarrow{\mathrm{H_3O^+}}$
(ii)
$\displaystyle \mathrm{CH_3CN} \xrightarrow[\text{(b) } \mathrm{H_2O}]{\text{(a) DIBAL-H}}$
(iii)
$\displaystyle \xrightarrow[\Delta]{\mathrm{H_3O^+}}$
OR(b) Arrange the following compounds in increasing order of their property as indicated :
(i)
$\displaystyle \mathrm{CH_3CHO}$, $\displaystyle \mathrm{CH_3CH_2CHO}$, $\displaystyle \mathrm{CH_3}{-}\overset{\textstyle\mathrm{O}}{\overset{\textstyle\|}{\mathrm{C}}}{-}\mathrm{CH_2}{-}\mathrm{CH_3}$, $\displaystyle \mathrm{CH_3}{-}\overset{\textstyle\mathrm{O}}{\overset{\textstyle\|}{\mathrm{C}}}{-}\mathrm{CH_3}$ (Reactivity towards HCN)
(ii)
$\displaystyle \mathrm{CH_3COOH}$, $\displaystyle \mathrm{Cl{-}CH_2{-}COOH}$, $\displaystyle \mathrm{(CH_3)_2CH{-}COOH}$ (Acidic strength)
(iii)
, , (Acidic strength)
Marking-scheme solution
(a)(i)
$\displaystyle \mathrm{CH_3COOH}$ / Ethanoic acid
(ii)
$\displaystyle \mathrm{CH_3CHO}$ / Ethanal
(iii)
/ Benzoic acid
OR
(b)(i)
$\displaystyle \mathrm{CH_3COCH_2CH_3} < \mathrm{CH_3COCH_3} < \mathrm{CH_3CH_2CHO} < \mathrm{CH_3CHO}$
(ii)
$\displaystyle \mathrm{(CH_3)_2CH-COOH} < \mathrm{CH_3COOH} < \mathrm{Cl-CH_2-COOH}$
(iii)
$\displaystyle <$ $\displaystyle <$
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