MCQ
$A$ & $B$ are respectively:


- A

- B

- C

- ✓








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Vapours $(B)+$ $\xrightarrow{{{K_2}{S_2}{O_8}}}\,(C)\, + \,(D)$
$(D)\,\xrightarrow{{(B)}}$ Brown $(E)$
Hybridisation of central atom in $(E)$ is
| Reactant |
$HIO_4$ consumed |
$HCO_2H$ formed |
$HCHO$ formed |
