Ozonolysis (Reductive) X Y Z -> Y can be obtained by Etard’s reaction, Z undergoes disproportion reaction with concentrated alkali ,X could be (KCET 2014) (a) (b) (c) (d)

The substance containing C=C double bond on ozonolysis using O3 followed by reductive cleavage using Zn/H2O produces two carbonyl compounds. Carbonyl compound obtained after reductive ozonolysis of (b) , (c) and (d) are as follows In each case, benzaldehyde is produced as one of the product but on the other hand formaldehyde, acetaldehyde and acetone are produce as other products. Thus, in order to select to correct choice, the concept of Cannizzaro reaction (disproportionation reaction)