MCQ
Primary, secondary and tertiary alcohols can be distinguish by:
- ABaeyer's reagent
- BFehling's solution
- CSulphuric acid
- ✓Lucas reagent
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$\begin{array}{l} Cl -\left( CH _2\right)_4- Cl \xrightarrow{\text { excess } NH _3} A \xrightarrow{ NaOH } \\ B + H _2 O + NaCl\end{array}$
Benzaldehyde, Acetaldehyde, Acetone, Acetophenone,Methanal, $4-$nitrobenzaldehyde, cyclohexane carbaldehyde.

$(I)$ $\begin{array}{*{20}{c}}
O \\
{||} \\
{Ph\, - C - Ph}
\end{array}$
$(II)$ $\begin{array}{*{20}{c}}
{\,\,\,\,O} \\
{\,\,\,\,||} \\
{C{H_3} - C - H}
\end{array}$
$(III)$ $\begin{array}{*{20}{c}}
O \\
{||} \\
{C{H_3} - C - C{H_3}}
\end{array}$
is