1.

Illustrate the following name reactions : (a) Cannizzaro's reaction(b) Clemmensen reduction

Answer»

Solution :(a) Cannizzaro.s reaction `:` Aldehydes which do not have an `alpha`- hydrogen atom, undergoes selfoxidation and reduction reaction on treatment with concentrated alkali.
`2HCHO overset( NaOH ) ( rarr)underset( "Methanol")(CH_(3)OH ) + underset( " Sodium methanoate")(HCOONa)`
`C_(6) H_(5) CHO overset( NaOH ) ( rarr) underset("Benzyl ALCOHOL")(C_(6) H_(5) CH_(2) OH) + underset("Sodium benzoate")(C_(6) H_(5) COONA)`
(b) Clemmensen reduction `:`
Aldehydes on reduction with Zn and HCl are reduced to alkanes.
`underset("Ethanal ")(CH_(3)CHO) overset( Zn//HCl)(rarr) underset( "Ethane")(CH_(3)CH_(3))`
`underset("Propanal")(CH_(3) CH_(2) CHO )overset( Zn//HCl)(rarr) underset("Propane")(CH_(3) CH_(2) CH_(3))`


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