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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 1 · Set 1 · Q7
(a) Illustrate the following reactions giving suitable example in each case: (i) Gabriel phthalimide synthesis. (ii) Carbylamine reaction. (iii)…
Illustrate the following reactions giving suitable example in each case :
(i)
Gabriel phthalimide synthesis.
(ii)
Carbylamine reaction.
(iii)
Hoffmann bromamide degradation reaction.
Write the structures of $\displaystyle \mathrm{A}, \mathrm{B}$ and C in the following reactions :
(i)
$\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl} \xrightarrow{\mathrm{KCN}} \mathrm{A} \xrightarrow{\mathrm{LiAlH}_{4}} \mathrm{~B} \xrightarrow[0^{\circ} \mathrm{C}]{\mathrm{HNO}_{2}} \mathrm{C}$
(ii)
$\displaystyle \mathrm{CH}_{3} \mathrm{COOH} \xrightarrow[\Delta]{\mathrm{NH}_{3}} \mathrm{~A} \xrightarrow[\text { (b) } \mathrm{H}_{2} \mathrm{O}]{\text { (a) } \mathrm{LiAlH}_{4}} \mathrm{~B} \xrightarrow{\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{SO}_{2} \mathrm{Cl}} \mathrm{C} \quad$
Marking-scheme solution
(i)
$\displaystyle \xrightarrow{\text{aq KOH}}$ $\displaystyle \xrightarrow[-\text{KX}]{\text{R}-\text{X}}$
$\displaystyle \xrightarrow{\text{aq NaOH}}$ R—NH$\displaystyle _2$ +
(ii)
R—NH$\displaystyle _2$ + CHCl$\displaystyle _3$ + 3KOH $\displaystyle \xrightarrow[\text{alc.}]{\Delta}$ RNC + 3KCl + 2H$\displaystyle _2$O
(iii)
R—CONH$\displaystyle _2$ + Br$\displaystyle _2$ + 4KOH $\displaystyle \xrightarrow{\text{alc./aq.}}$ R—NH$\displaystyle _2$ + K$\displaystyle _2$CO$\displaystyle _3$ + 2KBr + 2H$\displaystyle _2$O
(i)
A = CH$\displaystyle _3$CH$\displaystyle _2$CN, B = CH$\displaystyle _3$CH$\displaystyle _2$CH$\displaystyle _2$NH$\displaystyle _2$, C = CH$\displaystyle _3$CH$\displaystyle _2$CH$\displaystyle _2$OH
(ii)
A = CH$\displaystyle _3$CONH$\displaystyle _2$, B = CH$\displaystyle _3$CH$\displaystyle _2$NH$\displaystyle _2$, C = CH$\displaystyle _3$CH$\displaystyle _2$NH—SO$\displaystyle _2$—C$\displaystyle _6$H$\displaystyle _5$
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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.