Consider the following processes

Process (1) ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}/{\mathrm{H}}^{\oplus },{\mathrm{LiAlH}}_4,\mathrm{PCC}$

Process (2),${\mathrm{NaBH}}_4,\mathrm{Cu}/{300}^{\circ }\mathrm{C}$

Process (3) ${\mathrm{PCl}}_5,{\mathrm{LiAlH}}_4,{\mathrm{CrO}}_3/{\mathrm{H}}_2{\mathrm{SO}}_4$

Process (4) ${\mathrm{SOCl}}_2,\mathrm{Pd}/{\mathrm{BaSO}}_4/{\mathrm{H}}_2$

The process by which acetic acid can be converted into acetaldehyde is/are

Process (1) ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}/{\mathrm{H}}^{\oplus },{\mathrm{LiAlH}}_4,\mathrm{PCC}$

${\mathrm{CH}}_3{\mathrm{COOC}}_2{\mathrm{H}}_5+4\mathrm{H}\underset{\text{ or }{\mathrm{LiAlH}}_4}{\stackrel{\mathrm{Na}/{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{⟶}}\underset{ }{2{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}}$

Process (4) ${\mathrm{SOCl}}_2,\mathrm{Pd}/{\mathrm{BaSO}}_4/{\mathrm{H}}_2$

$$\begin{gathered} \mathrm{Ph}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}-\mathrm{OH}+\mathrm{Cl}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{S}}-\mathrm{Cl}⟶\underset{\downarrow }{\mathrm{Ph}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}+\mathrm{O}-\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{S}}+\mathrm{Cl} + \mathrm{HC}}\mathrm{l} \\ \mathrm{Ph}—\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\underset{\left(\mathrm{A}\right)}{\mathrm{C}}-} \mathrm{Cl} + {\mathrm{SO}}_2 +\mathrm{HCl} \\ \mathrm{Ph}—\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}—\mathrm{Cl} \underset{\mathrm{Pd}—{\mathrm{BaSO}}_4}{\overset{{\mathrm{H}}_2}{\to }}\mathrm{Ph}—\stackrel{\stackrel{\mathrm{O}}{\parallel }}{\mathrm{C}}—\mathrm{H} \end{gathered}$$

Here, only in these two reactions acetic acid can be converted into acetaldehyde.