MCQ
Which of the following molecule has a planar structure ?
- A$O_2SF_2$
- B$OSF_2$
- ✓$XeF_4$
- D$ClO_4^-$

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$C{H_3}C{H_2}CH = CHC{H_3}$ $\xrightarrow{X}C{H_3}C{H_2}COOH\, + \,C{H_3}COOH$
The $X$ is
