MCQ
Which of the following will be optically inactive


- A$A$ only
- B$A$ & $D$
- ✓$A, C$ & $D$
- DAll of these

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$(a)$ $HCHO$ $(b)$ $C_6H_5-CHO$
$(c)$ $\begin{array}{*{20}{c}}
{\,\,C{H_3}} \\
{\,|\,\,\,\,\,} \\
{C{H_3} - C - CHO} \\
{|\,\,\,} \\
{\,\,C{H_3}\,}
\end{array}$ $(d)$ $Ph-CH_2-CHO$
$(1)$ Reaction of gold with aqua regia produces $NO _2$ in the absence of air
$(2)$ Aqua regia is prepared by mixing conc. $HCl$ and conc. $HNO _3$ in $3: 1$ ($v/v$) ratio
$(3)$ Reaction of gold with aqua regia produces an anion having $Au$ in +$3$ oxidation state
$(4)$ The yellow colour of aqua regia is due to the presence of $NOCl$ and $Cl _2$
