MCQ
Which of the following molecule contains both ionic and covalent bond
- A$CH_2Cl_2$
- ✓$K_2SO_4$
- C$BeCl_2$
- D$SO_2$
$2{K^ + } \vdots \vdots \vdots \vdots \vdots \vdots \vdots \vdots SO_4^{2 - }$
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$[Figure]$ $\xrightarrow[{(ii)\,{H_2}S{O_4}\,,\,heat}]{{(i)\,OHCC{H_2}COCl}}$
$\left[ K _{ f } \text { of water }=1.86 \ K \ kg \ mol ^{-1}\right]$

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$D$-Erythrose and its isomers are listed as $P , Q , R$, and $S$ in Column-$I$. Choose the correct relationship of $P , Q , R$, and $S$ with D-erythrose from Column $II$.
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