1.

Describe the following giving linked chemical equations : (a) Cannizzaro reaction(b) Decarboxylation

Answer»

Solution :(a) Cannizzaro reaction `:` Aldehydes which do not have an a-hydrogen atom, undergoes self oxidation and reduction on treatment with concentrated alkali.
Examles, `HCHO overset("Conc. NaOH ")(rarr) CH_(3) OH + HCOONa`
`C_(6)H_(5) CHO overset("Conc. NaOH ")(rarr) underset("Benzyl alcohol")(C_(6) H_(5) CH_(2) OH) + underset( " Sodium benzoate")(C_(6) H_(5) COONa)`
(b) Decarboxylation `:`
Sodium salt of an acid on treatment with soda LIME ( `NaOH // CaO `) gives a hydrocarbon.
`CH_(3) COONa + NaOH underset("CaO")overset("Soda lime")(rarr) underset( "Methane")(CH_(4)) + Na_(2) CO_(3)`


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