1.

How will you bring about the following conversion ? (i) Benzoic acid to benzaldehyde (ii) Ethanal to but-2-enal (iii) Propanone to propene Give complete reaction in each case.

Answer»

Solution :(i) Benzoic acid to BENZALDEHYDE `:`

(ii) Ethanal to but-2-enal `:`
`underset( "Ethanal ")(2CH_(3) CHO) underset("Aldol condensation")OVERSET("Dil. NaOH")(rarr) underset( "Aldol")(CH_(3) - underset( OH ) underset( |)(CH) - CH_(2) ) - CHO underset( - H_(2) O) overset( Delta ) ( rarr) underset( "But-2-enal")(CH_(3) -CH = CH- CHO )`
(III) PROPANONE to propene `:`
`underset("Propanone ")(CH_(3) COCH_(3)) overset( Na//"Alcohol")(rarr) underset("Propan-2-ol")(CH_(3)CHOHCH_(3)) overset( H^(+))(rarr) underset( "Propene")(CH_(3)CH) = CH_(2)`


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