Write in brief about the preparation of alkene from vicinal dihalide.
(N/A) Vicinal dihalides are compounds in which two halogen atoms are attached to two adjacent carbon atoms.
Dehalogenation: When vicinal dihalides are treated with zinc metal,they lose a molecule of $ZnX_2$ to form an alkene. This reaction is known as dehalogenation.
Examples:
$(i) \ CH_2Br-CH_2Br + Zn \xrightarrow{\Delta, \text{Ethanol}} CH_2=CH_2 + ZnBr_2 \ (\text{Ethene})$
$(ii) \ CH_3-CHBr-CH_2Br + Zn \xrightarrow{\Delta, \text{Ethanol}} CH_3CH=CH_2 + ZnBr_2 \ (\text{Propene})$
Dehalogenation: When vicinal dihalides are treated with zinc metal,they lose a molecule of $ZnX_2$ to form an alkene. This reaction is known as dehalogenation.
Examples:
$(i) \ CH_2Br-CH_2Br + Zn \xrightarrow{\Delta, \text{Ethanol}} CH_2=CH_2 + ZnBr_2 \ (\text{Ethene})$
$(ii) \ CH_3-CHBr-CH_2Br + Zn \xrightarrow{\Delta, \text{Ethanol}} CH_3CH=CH_2 + ZnBr_2 \ (\text{Propene})$
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