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The reaction intermediates involved in t...

The reaction intermediates involved in the addition of HBr to propene in the presence of an organic peroxide are
(a) free radicals
(b)carbocations
(c)carbanions
(d)carbenes

A

`CH_(3)-CH -CH_(2) CI`

B

`CH_(3) -overset(+)(CH) -CH_(3)`

C

`CH_(3) -CH_(2)-CH_(2)`

D

`CH_(3)-CH_(2)-overset(+)(CH_(2))`

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Reaction intermdiates are short lived species and are highly reactive. They are formed by heterolytic and homolytic bond fission. There are various types of reaction intermediates in which the most important are carbocation , carbanion and free radical. Carbocation is an organic species in which carbon have positive charge and six electrons in its outermost shell. The stability of carbocation can be increased by positive inductive effect, hyperconjugation and delocalisation. If alpha -atom with respect to carbocation has one or more lone pair of electron then lone pair of electron strongly stabilises the carbocation due to octet completion. Species in which carbon have negative charge is called carbanion. Carbanion carries three bond pairs and one lone pair. The stability of carbanion can be increased by negative inductive effect, negative mesomeric effect and delocalisation. Free radical is a species which have seven electrons in its outermost shell. The stability of free radical can be increased by hyperconjugation and delocalisation. The stability order of following carbocations is