MCQ
How many $\sigma $ and $\pi$ bonds are present in $CH_3COOH$ ?
- A$1,7$
- B$5,2$
- ✓$7,1$
- D$3,2$

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$I.\,H_2S_2O_6\,\,\,\,\,\,\,\,II.\,H_2SO_3\,\,\,\,\,\,\,\,III.\,H_2SO_5$
$X + C{r_2}{O_3}\xrightarrow{\Delta }Y$ (Green coloured)
$X$ and $Y$ are