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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
A metallic carbide on treatment with water gives a colourless gas which burns readily in air and which gives a precipitate with ammoniacal silver nitrate solution. Gas evolved is
  • A
    Methane
  • B
    Ethane
  • ✓
    Acetylene
  • D
    Ethylene
✓

Answer

Correct option: C.
Acetylene
c
(c) $Ca{C_2} + 2\,{H_2}O \to Ca\,{\left( {OH} \right)_2} + {C_2}{H_2}$

$CH \equiv CH + 2\,[Ag\,{(N{H_3})_2}]OH \to Ag\mathop { - \,C \equiv C - }\limits_{{\rm{White}}\,{\rm{ppt}}{\rm{.}}} Ag + 4\,N{H_3} + 2\,{H_2}O$

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