Answer:
1-because of mesomerism in carbon-halogen bond result to formation of a degree of double bond
Step-by-step explanation:
[ Methylene=CH_X ] [ (-)Methylene_CH=X(+) ]
2- their preparation from ethylene dihalide
in vinyl chloride there exist a partial double bond between chlorine and carbon atoms.this partial double bond increases the strength of bond between carbon and chlorine.
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