SN₁reactions are accompanied by racemization in optically active alkyl halides. Give reason.

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Solution

In SN1 reaction two types of products are possible.After a carbo cation is formed a nucleophile can come from two sides of trigonal planar structure to form bonds.depending upon the position of the newly bonded nucleophile two types of products are possible.one of which has same geometry as that the reactant or it retains its original geometry hence called retention and other will inverse its geometry called inversion.the 50 percentage mixture of both inversed and retained geometry is called racemic mixture and process is called racemisation.

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Q. Give reasons:
(i)

C - C l

bond length in chlorobenzene is shorter than

C - C l

bond length in

C H_{3} - C l

.
(ii) The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
(iii)

S_{N} 1

reactions are accompanied by racemization in optically active alkyl halides.

Q. Assertion :Statement-I : nucleophilic substitution reaction on an optically active alkyl halide gives a mixture of enantiomers.
Because Reason: Statement-II : The reaction occurs by

S_{N} 1

mechanism.

The substitution reaction of optically active alkyl halides in which attack of nucleophile and detachment of halogen takes place in two different steps and racemic mixture is formed as product is:

Q. When a chiral alkyl halide undergoes a

S_{N} 1

reaction, a racemic mixture is formed.

Q. An optically active halide when allowed to react with

C N^{⊖}

gives a racemic mixture, the halide is most likely:

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SN1 reactions are accompanied by racemization in optically active alkyl halides. Give reason.

SN₁reactions are accompanied by racemization in optically active alkyl halides. Give reason.