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Q.

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Mark the incorrect statement regarding the reaction:

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a

In the presence of pyridine, gives (S) - 1 - chloro - 1- phenyl ethane

b

In the absence of pyridine inversion of configuration occur

c

Kinetically reaction is nucleophilic substitution biomolecular

d

Stereochemically reaction is said SNi (nucleophilic substitution internal)

answer is A, B.

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Detailed Solution

Reactant molecule configuration is -
 

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In the presence of pyridine, pyridinium chloride forms, gives out effective nucleophile Cl-, back side attack takes place, inversion occurs.

In the absence of pyridine internal attack takes place retention of con observed.

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