MCQ
When $KBr$ is treated with concentrated ${H_2}S{O_4}$ redish brown gas evolved, gas is
- AMixture of bromine and $HBr$
- B$HBr$
- ✓Bromine
- DNone of these
$2KHS{{O}_{4}}+MnS{{O}_{4}}+2{{H}_{2}}O+B{{r}_{2}}$
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$R - Br + C{l^ - }\xrightarrow{{DMF}}R - Cl + B{r^ - }$ ,
which one of the following undergoes complete inversion of configuration?
$A$ and $B$ are :