1.

Identify a reagent from the following list which can easily distinguish between 1-butyne and 2-butyne.

Answer»

BROMINE , `C Cl_4`
`H_2`, Lindlar catalyst
Dilute `H_2SO_4, HgSO_4`
Ammonical `Cu_2Cl_2` solution

Solution :In butyne-1, ACIDIC HYDROGEN is present while in butyne-2 acidic hydrogen is not present, so butyne-1 give red ppt. with ammonical `Cu_2Cl_2` SOLUTIONS, while butyne-2 does not give these ppt.
`UNDERSET"butyne-1"(2CH_3-CH_2-C)-=CH+Cu_2Cl_2+2NH_4OH to underset"red ppt."(2CH_3-CH_2)-C-=C.Cu darr +2NH_4Cl +2H_2O`
`CH_3-C-=C-CH_3+Cu_2Cl_2+2NH_4OH to ` No reaction


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