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Question
What are addition reactions? Why ethene undergo addition reactions? Give
two examples.
Solution
Addition Reaction : The reactions in which molecules of the attacking reagent add across the double or triple bond of an unsaturated compound to yield saturated compound.
Ethene is a reactive compound due to presence of double bond. hence undergo addition reactions.
Two examples:
(i) Addition of hydrozen : \[\ce{CH2 = CH2 + H2 ->[ni][300°C] Ch3 - CH3}\]
(ii) Addition of halogens: \[\ce{Ch2 = CH2 + Br -> CH2Br - Ch2Br}\]
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\[\begin{array}{cc}
\phantom{.....................}\ce{H}\phantom{...}\ce{H}\phantom{....}\ce{O}\phantom{...............}\\
\phantom{...........}| \phantom{....}|\phantom{.} \phantom{..}//\phantom{......}\\
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\phantom{.......}| \phantom{....}|\phantom{..}\phantom{..}\text{\\} \phantom{..}\\
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\end{array}\]
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