MCQ
Gas that can not be collected over water is
- A$N_2$
- ✓$O_2$
- C$SO_2$
- D$PH_3$
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$CH_3 - CH = CH - CH_3 \xrightarrow{{{O_3}}} A $$\xrightarrow[{Zn}]{{{H_2}O}} B.$
The compound $B$ is
The number of compounds/species which obey Huckel's rule is $..........$