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CBSE Class 12 Chemistry 2016 Delhi Set 1 Solved Paper

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Question : 19 of 26
Marks: +1, -0
Write the structures of A,BA, B and CC in the following :
(a) C6H5−CONH2→Br2/aq⋅KOH\mathrm{C}_6\mathrm{H}_5-\mathrm{CONH}_2 \xrightarrow{\mathrm{Br}_2/\mathrm{aq} \cdot \mathrm{KOH}} A→0−5∘NaNO2+HClB→KICA \xrightarrow[0-5^{\circ}]{\mathrm{NaNO}_2 + \mathrm{HCl}} B \xrightarrow{\mathrm{KI}} C.
(b) CH3−Cl→KCNA→LiAIH4\mathrm{CH}_3-\mathrm{Cl} \xrightarrow{\text{KCN}} A \xrightarrow{\mathrm{LiAIH}_4} B→CHCl3+alc.KOHCB \xrightarrow{\mathrm{CHCl}_3 + \text{alc.KOH}} C.
Solution:  
(a) C6H5−CONH2→Br2/aq⋅KOH\mathrm{C}_6\mathrm{H}_5-\mathrm{CONH}_2 \xrightarrow{\mathrm{Br}_2/\mathrm{aq} \cdot \mathrm{KOH}} C6H5NH2[A]→NaNO2+HClC6H5N2+Cl−[B]\mathrm{C}_6\mathrm{H}_5\mathrm{NH}_2[A] \xrightarrow{\mathrm{NaNO}_2 + \mathrm{HCl}} \mathrm{C}_6\mathrm{H}_5\mathrm{N}_2^{+}\mathrm{Cl}^{-}[B]  →KIC6H5I[C]\xrightarrow{\mathrm{KI}} \mathrm{C}_6\mathrm{H}_5\mathrm{I}[C].
(b) CH3−Cl→KCNCH3CN[A]→LiAIH4\mathrm{CH}_3-\mathrm{Cl} \xrightarrow{\text{KCN}} \mathrm{CH}_3\mathrm{CN}[A] \xrightarrow{\mathrm{LiAIH}_4} CH3CH2NH2[B]\mathrm{CH}_3\mathrm{CH}_2\mathrm{NH}_2[B] →ΔCHCl3+KOHCH3CH2NC[C]\xrightarrow[\Delta]{\mathrm{CHCl}_3 + \text{KOH}} \mathrm{CH}_3\mathrm{CH}_2\mathrm{NC}[C].
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