MCQ
Which of the following species is paramagnetic in nature
- ACarbanion
- BCarbonium ion
- ✓Free radical
- DAll the above
✓
Answer
Correct option: C.
Free radical
c
(c) Without intermediate reaction take place as under
(c) Without intermediate reaction take place as under
$C{H_3} - CH = C{H_2} + HBr \to C{H_3} - \mathop {\mathop C\limits^| H}\limits^{Br\,} - C{H_3}$
(According to markownikoff rule)
But the halogen bonded with terminal carbon so it take place in presence of peroxide by free radical mechanism.
$\mathop {R - O - OR}\limits_{{\rm{peroxide}}} \to 2R\mathop O\limits^. $; $HBr + \mathop {RO}\limits^. \to ROH + B{r^.}$
$C{H_3} - CH = C{H_2} + B{r^.} \to C{H_3} - C\mathop H\limits^. - C{H_2} - Br$
$C{H_3} - \mathop C\limits^. H - C{H_2}Br + HBr \to $ $C{H_3} - C{H_2} - C{H_2}Br + B{r^.}$
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