MCQ
Which is correct ?


- Achiral
- B$C_3$ axis of symmetry
- COptically active
- ✓All of these


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$(I)\,\,B{r^ - }{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} $ $(II)\,\,\begin{array}{*{20}{c}}
{{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} O{\mkern 1mu} } \\
{{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} ||} \\
{{H_3}C - C - {O^ - }}
\end{array}$ $(III)\,\,C{H_3}C{H_2}{O^ - }$ $(IV)\,\,Ph - {O^ - }$
$(I)$ $AgNO_3$ $(II)$ $CaCO_3$
$(III)$ $Pb(NO_3)_2$ $(IV)$ $Na_2CO_3$

$Image$
The structure of $L -(-)$-glucose is