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Question
With alcoholic potash, C4H8Cl2 (A) gives C4H6 (B), which reacts with ammoniacal cuprous chloride, Identify the compounds (A) and (B).
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Solution
The reactions are given below:H3C−CH2−CH2−CHCl2+H3C−CH2−CHCl−CHCl2 alc. KOH−−−−−−−→H3C−CH2−C≡CH[Cu(NH3)2]−−−−−−−−−→H3C−CH2−C≡C−Cu
Hence, C4H8Cl2 (A)= 1,1− dichlorobutane and 1,2− dichlorobutane. They react with alcoholic KOH to give But-1-yne (B) which then reacts with ammoniacial cuprous chloride to give red precipitate of copper butyride.
H3C−CH2−CH2−CHCl2+H3C−CH2−CHCl−CHCl2 alc. KOH−−−−−−−→H3C−CH2−C≡CH
[Cu(NH3)2]−−−−−−−−−→H3C−CH2−C≡C−Cu
Hence, C4H8Cl2 (A)= 1,1− dichlorobutane and 1,2− dichlorobutane.
They react with alcoholic KOH to give But-1-yne (B) which then reacts with ammoniacial cuprous chloride to give red precipitate of copper butyride.
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