Discuss preparation of: Gem-dihalides:

1.	Discuss preparation of: Gem-dihalides:
Answer» Solution :Gem-dihalides: Ethylidene dichloride (1,1-Dichloro ethane) is prepared by (a) TREATING aetaldehyde with `PCl_(5)` `UNDERSET("Acetaldehyde")(CH_(3)CHO +PCl_(5)) to underset("Ethylidene dichloride")(CH_(3)CHCl_(2)+POCl_(3))`. (b) Adding hydrogen chloride to ACETYLENE `underset("Acetylene")(HC-=CH)+HCl to underset("Vinylchloride")(CH_(2)=underset(Cl)underset(\|)(C)Hoverset(HCl)to underset("Ethylidene dichloride")(CH_(3)-CHCl_(2))`.

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