1.

Consider the following substances (1)HCHO ""(2) CH_(3)CHO (3) CH_(3)COCH_(3)""(4) CH_(3)COC_(2)H_(5) The correct order of reactivity towards nucleophilic addition reaction is

Answer»

`1 gt 2 gt 3 gt 4`
` 1 gt 3 gt 2 gt 4`
` 1 gt 2 gt 4 gt 3`
` 1 gt 4 gt 2 gt 3`

SOLUTION :Aldehydes are more reactive than KETONES towards NUCLEOPHILIC addition reactions, due to the electron repelling inductive effect `(+I)` of alkyl GROUPS. The alkyl groups at the carbonyl carbon in ketones reduces the positive charge over it and therefore, the tedency of a nucleophilic attack is reduced. The bulky alkyl groups ALSO decrease the reactivity of `gt C = O` group , due to steric hindrance.


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