MCQ
Formamide is
- ✓$HCON{H_2}$
- B$C{H_3}CON{H_2}$
- C$HCOON{H_4}$
- D$(HCHO + N{H_3})$

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