1.

Ester having alpha-hydrogen on treatement with a strong base eg. C_(2)H_(5)Ona undergoes self condensation to produce beta-keto esters. This is called claisen condensation CH_(3)-underset(O)underset(||)(C)-CH_(2)-underset(O)underset(||)(C)-OEt overset((1)C_(2)H_(5)ONa)underset((2)CH_(3)-I)to overset((1)H_(2)O^(-))underset((2)Delta)to

Answer»

`CH_(3)-UNDERSET(O)underset(||)(C)-CH_(2)-CH_(3)`
`CH_(3)-underset(O)underset(||)(C)-CH_(2)-CH_(2)-CH_(3)`
`CH_(3)-underset(O)underset(||)(C)-CH_(3)`
`CH_(3)-underset(O)underset(||)(C)-CH_(2)-COOH`

SOLUTION :`CH_(3)-underset(O)underset(||)(C)-CH_(2)-underset(O)underset(||)(C)-Oet OVERSET(C_(2)H_(5)O^(o))toCH_(3)-underset(O)underset(||)(C)-overset(o)(C)H-underset(O)underset(||)(C)-Oet overset(CH_(3)I)to CH_(3)-underset(O)underset(||)(C)-overset(CH_(3))overset(|)(C)H-underset(O)underset(||)(C)-OEt overset(H_(2)O)underset(DELTA)toCH_(3)-underset(O)underset(||)(C)-CH_(2)-CH_(3)`


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