1.

Give the structures of the major organic products from 3-ethyl-2-pentene using (i) HBr in the presence of peroxide and (ii) HCl in the presence of peroxide.

Answer»

Solution :(i) `CH_(3)CH_(2) - overset(overset(C_(2)H_(5))(|))(C )= CH-CH_(3) + HBr overset("PEROXIDE")rarr CH_(3)CH_(2)- overset(overset(C_(2)H_(5))(|))(CH)-overset(overset(BR)(|))(C )HCH_(3)`
This is anti-Markovnikoff addition
(ii) `CH_(3)CH_(2)- overset(overset(C_(2)H_(5))(|))(C )=CH-CH_(3) + HCl overset("Peroxide")rarr CH_(3)CH_(2)- underset(underset(Cl)(|))overset(overset(C_(2)H_(5))(|))(C )-CH_(2)CH_(3)`
This is Markovnikoff addition, since peroxide EFFECT is not observed in HCl


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