In which of the following reactions benzaldehyde is the final major products
`(i) Ph-CH_(3)+CrO_(3)+(CH_(3)CO)_(2) O overset(273-283K)to overset(H_(3)O^(+))underset(Delta)to`
(ii) `Ph-CH_(3)-overset(Cl_2)underset(hv)to Ph-CHCl_(2) overset(H_(2)O)underset(100^(@)C)to`
`(iii) C_(6)H_(6) overset(CO+HCl)underset(AlCl_(3))to`
`(iv) Ph-COCl+(CH_(3))_(2)Cd to `

Options

A. I and ii only
B. ii and iii only
C. iii and iv only
D. I,ii and iii only

Answer

D

Explanation

(i) `Ph-CH_(3)+CrO_(3)+(CH_(3)CO)_(2)O overset(273-283K)toPh-CH(OCOCH_(3))_(2) overset(H_(3)O^(+))underset(Delta)toPh-CHO`
(ii) `Ph-CH_(3) overset(Cl_(2))underset(Hv)toPh-CHCl_(2) overset(H_(2)O)underset(100^(@)C)toPh-CHO`
`(iii) C_(6)H_(6) overset(CO+HCl)underset(AlCl_(3))toPH-CHO`
`(iv) Ph-COCl+(CH_(3))_(2)Cd to Ph-CO-CH_(3)`