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  4. What is true about the reaction given below? CH3 - CH = CH - CH3 + CH2I2 xrightarrow[Et2O]Zn-Cu

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Q. What is true about the reaction given below?
$CH_3 - CH = CH - CH_3 + CH_2I_2\xrightarrow[Et_2O]{Zn-Cu}$

Hydrocarbons

Solution:

Reaction involves $CH_2$ intermediate and it undergoes synaddition at double bond, hence stereochemistry of products depends on stereochemistry at double bond as:
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