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Oxymercuration Demercuration Reactions

17. Reaction ...

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17. Reaction of Alcohol with PCl5 follows SNi or SN2 meachanism??

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Q. Explain the mechanism of

S_{N} 2

reaction with one example.

S N^{2}

mechanism for conversion of methyl chloride to methyl alcohol.

Q. Which of the following reaction(s) is/are of

S_{N} 2

Q. Assertion :Tert-butyl methyl ether on treatment with HI at

100^{o} C

gives a mixture of methyl iodide and tert-butyl alcohol. Reason: This reaction occur via

S_{N} 2

Q. Alkyl halides and alcohols easily undergo nucleophilic substitution either through

S_{N} 1

S_{N} 2

mechanism. The relative case of these two processes depends upon the nature of the substrate (alkyl group) as well as leaving group, nature of nucleophile and also upon the nature of the solvent.

S_{N} 1

mechanism involves the formation of carbocation as intermediate while

S_{N} 2

mechanism involves the formation of a transition pentavalent state.

S_{N} 1

is the main mechanism in

3^{0}

alkyl halides and alcohols, while

S_{N} 2

mechanism is the path adopted by most of the

1^{o}

2^{o}

alkyl halides may follow

S_{N} 1

S_{N} 2

.

What happens when

1^{o} R O H

H X

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