There are two reasons for less reactivity of Alkynes towards electrophillic addition reactions:-
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Choose an amount Or enter a custom amount Your contribution is appreciated. Your contribution is appreciated. Your contribution is appreciated. DonateDonate monthlyDonate yearlyAlkenes are more reactive due to the presence of a carbon carbon double bond (always important to state what the double bond is between or may not get the marks!). This is because the carbon carbon double bond is a centre for high electron density and so can be attacked by an electrophile (an ion or molecule that attacks regions of high electron density) which will break the bond. The carbon carbon double bond is made up of a pi bond and a sigma bond. The pi bond is weak and can be relatively easily broken meaning new single bonds can be formed. Alkenes are a family of hydrocarbons (compounds containing carbon and hydrogen only) containing a carbon-carbon double bond. Alkenes are relatively stable compounds, but are more reactive than alkanes because of the reactivity of the carbon–carbon π-bond. Most reactions of alkenes involve additions to this π bond, forming new single bonds.
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