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How are alkenes obtained?

1 Answer

Apr 30, 2016

Alkenes are obtained by elimination reactions

Explanation:

Alkenes are obtained by elimination reactions Following are some examples.

Dehydration of Alcohol
In this process alcohol is dehydrated
(1) byheating with conc. $H_{2} S O 4 a t 450 K$ $H_2SO4 at 450K$ or by $P_{2} O_{5}$ $P_2O_5$
or (2) by passing alcohol vapor over heated Alumina, $A l_{2} O_{3}$ $Al_2O_3$

Reaction
$R C H_{2} C H_{2} O H \to R C H = C H_{2} + H_{2} O$ $RCH_2CH_2OH->RCH=CH_2+ H_2O$

Dehydrohalogenation
In this process Alkyl halide except fluoride is reacted with alcoholic $K O H$ $KOH$
Reaction
$R C H_{2} C H_{2} X \to R C H = C H_{2} + H X$ $RCH_2CH_2X->RCH=CH_2+ HX$ (where X =Cl,Br,I)

- Dehalogenation
In this process vicinal or geminal dihalide except fluoride is heated with alcoholic $Z n$ $Zn$

Reaction
$R C H X C H_{2} X + Z n \to R C H = C H_{2} + Z n X_{2}$ $RCHXCH_2X+Zn->RCH=CH_2+ ZnX_2$ (where X =Cl,Br,I)

Other process like cracking of alkane is also there

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