CHEMISTRY OF ETHYNE
 
 
 
INTRODUCTION
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   Molecular formula = C2H2
   Empirical formula = CH
   Molecular mass = 26
   Empirical mass = 13
   Common name = Acetylene
   Homologous series = Alkynes
STRUCTURE OF ETHYNE
 
   COMPOSITION OF ETHYNE MOLECULE:
   Ethyne molecule consists of two C-atoms and two H-atoms (C2H2).
   BOND LENGTH:
   The C--H bond is 1.2Ao.
   BOND ANGLE:
   HCC bond angle is 180o.

METHODS OF PREPARATION
 
   BY THE HYDROLYSIS OF CARBON CARBIDE:
          CaC2 + 2H2O C2H2 + Ca(OH)2
   BY TETRA CHLOROETHANE:
          Cl2CH-CHCl2 + 2Zn C2H2 + 2ZnCl2             
CHEMICAL PROPERTIES
 

   COMBUSTION REACTION:
        Ethyne burns in air with a luminous smoky flame and hence used for lightening purpose.
          2C2H2 + 5O2 4CO2 + 2H2O + heat
   ADDITION REACTIONS:
   Addition of Hydrogen:
          C2H2 CH2=CH2 C2H6
   Addition of Chlorine:
          C2H2 +Cl2 Cl-CH=CH-Cl Cl2CH-CHCl2
   Addition of Hydrogen Halide:
          C2H2 + HBr CH2=CH-Br + HBr CH3-CHBr2

PHYSICAL PROPERTIES
 
   Ethyne is a colourless gas with a characteristic smell.
   It has a melting point -81oC.
   It has a boiling point -84oC.
    It is significantly soluble in water. However readily soluble in organic solvents.
USES OF ETHYNE
 
   It is used in welding to produce oxy-acetylene flame of temperature about 3000oC.
   It is used in the synthesis of useful compounds such as ethanol, ethanoic acid, PVC, acetaldehyde.
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