CBSE 2022 · Region 2 · Set 3 · Q4 · 3 marks

(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)

$\displaystyle \xrightarrow[\Delta]{\mathrm{H_3O^+}}$

(iii)

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)

CBSE Class 12 Chemistry past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.