Question

How is propyne prepared by 1 2 dicloropropane

Answer 1

Propyne can be prepared by dehydrohalogenation of 1,2-dichloropropane.

1,2-Dichloropropane on first dehydrohalogenation gives 1-chloropropene.

CH3-CH(Cl)-CH2(Cl) + ∆ --> CH3-C(Cl)=CH + HCl

1-Chloropropene on further dehydrohalogenation gives propyne.

CH3-C(Cl)=CH2 + ∆ --> CH3-C≡CH + HCl

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