MCQ
Number of bonds in benzene
- A$6\sigma $ and $3\pi $
- ✓$12\sigma $ and $3\pi $
- C$3\pi $ and $12\pi $
- D$6\sigma $ and $6\pi $

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$(a)$ Ionisation energy $(Na < Li < B < Be)$
$(b)$ Electron affinity $(N < P < O < S)$
$(c)$ Electron negativity $(S < O < Cl < F)$
$(d)$ Atomic radii $(F < N < O < Na)$

$R - Br + C{l^ - }\xrightarrow{{DMF}}R - Cl + B{r^ - }$ ,
which one of the following undergoes complete inversion of configuration?