$'X'\,\,\xrightarrow{{water}}$ અદ્રાવ્ય
$'X'\xrightarrow{{5\% \,HCl}}$ અદ્રાવ્ય
$'X'\xrightarrow{{10\% \,NaOH}}$ અદ્રાવ્ય
$'X'\xrightarrow{{10\% \,NaHC{O_3}}}$ અદ્રાવ્ય
\(o\,-\) toluidine is not soluble in \(NaOH\) as well as \(NaHCO_3\)
Benzamide is also not soluble in \(NaOH\) and \(NaHCO_3\).
\(\therefore \) \(m\,-\) cresol is the right answer.
[Figure] $\xrightarrow[{Oxidation}]{{Vigorous}}\,X\,\xrightarrow[{Heating}]{{Dry}}Z$
Vigorous Oxidation $=$ તિવ્ર ઓક્સિડેશન
Dry Heating $=$ સૂકું,ગરમી