Among the following, the number of reaction(s) that produce(s) benzaldehyde is
I.
II.
III.
IV.
I.
II.
III.
IV.
Answer: 4
Solution
All four reactions produce benzaldehyde:
(I) Rosenmund reduction of benzoyl chloride with H₂/Pd-BaSO₄ gives benzaldehyde.
(II) Etard reaction: toluene with CrO₂Cl₂ followed by hydrolysis gives benzaldehyde.
(III) Gattermann-Koch reaction: benzene with CO and HCl in presence of AlCl₃/CuCl gives benzaldehyde.
(IV) Oxidation of benzyl alcohol with PCC or similar mild oxidizing agents gives benzaldehyde.
All 4 reactions produce benzaldehyde.
(I) Rosenmund reduction of benzoyl chloride with H₂/Pd-BaSO₄ gives benzaldehyde.
(II) Etard reaction: toluene with CrO₂Cl₂ followed by hydrolysis gives benzaldehyde.
(III) Gattermann-Koch reaction: benzene with CO and HCl in presence of AlCl₃/CuCl gives benzaldehyde.
(IV) Oxidation of benzyl alcohol with PCC or similar mild oxidizing agents gives benzaldehyde.
All 4 reactions produce benzaldehyde.
JEE Advanced · 2015 · 24 May 2015 · Paper 2 · Integer answer