Ncert Exercises & Solutions

Alkenes and carbonyl compounds both contain a $π$ bond but alkenes show electrophilic addition reactions whereas carbonyl compounds show nucleophilic addition reactions. Explain.

Nature of chemical reaction occurring on >C=C.< bond or >C=0 bond can be explained on the basis of nature of bond between >C=C< and >C=O.

>C=C< >C=O

Non-polar covalent compound Polar covalent compound

∙

Due to the electronegativity difference between carbon and oxygen
Thus, in > C = O carbon acquires partially positive charge and O acquires partially negative. charge and show nucleophilic addition reaction to the electrophilic carbonyl carbon. On the other hand, >C=C< undergo electrophilic addition reaction due to nucleophilic nature of >C=C< which contains

π

bond.

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