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Question

Which of the following reactants is suitable for preparation of methane and ethane by using one step only?
  1. H2C=CH2
  2. CH3OH
  3. CH3Br
  4. CH3CH2OH


Solution

The correct option is C CH3Br
Preperation of alkane from alkyl halide :

Methane preparation from CH3Br :

CH3Br+H2Zn,dil. HClCH4+ZnBr2
Here Zn,dil.HCl acts as reducing agent.


Ethane preperation from  CH3Br:
Wurtz reaction :

CH3Br+2Na+BrCH3Dry etherCH3CH3+2NaBr
 

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