Reaction by which benzaldehyde cannot be prepared is

• Correct answer
  A

  Benzoic acid $\stackrel{\mathrm{Zn} \text {. } \mathrm{Hg} \text { and conc. } \mathrm{HCl}}{\longrightarrow}$
• B

  Toluene $\frac{\text { (i) } \mathrm{CrO}_2 \mathrm{Cl}_2 \text { in } \mathrm{CS}_2}{\text { (ii) } \mathrm{H}_3 \mathrm{O}^{+}}$
• C

  Benzoyl chloride $+\mathrm{H}_2 \stackrel{\mathrm{Nd}-\mathrm{BaSO}_4}{\mathrm{~A}}$
• D

  $\mathrm{Benzene}+\mathrm{CO}+\mathrm{HCl} \stackrel{\text { Anhyd } \mathrm{AlCl}_3}{\longrightarrow}$

Solution

(a)
(b)
(c)
(d)

Hence, the correct answer is option: 'A'.