The slowest step of an SNI reaction involves: A attack of the nuclcophile on the

Question

The slowest step of an SNI reaction involves: A attack of the nuclcophile on the substrate to form a pentavalent carbon. B breaking the bond between the carbon and the leaving group to give a carbocation. C combination of a nucleophile with the carbocation to give the product. D loss of a proton from the nucleophile to give the product. E None of the above. 7 8. Which of the following nucleophiles is best suited for an S2 reaction? EtsN B NH D NaOEt E EtOH 9. Which of the following alkyl halides is best suited for an SN2 reaction? B 2 10. Which reagent(s) can convert CHiCH OH to CH:CO2H? A CrO, aq. H:SO B H CrO, acetone C PCC D A and B above. E Band C above.

Explanation / Answer

7) option B is correct

Explanation: Dissociation of alkyl halide produces carbocation as an intermediate. Formation of intermediate is the slowest step of SN1 mechanism.

8) NaOEt is the best nucleophile

Explanation: strong nucleophiles are best nucleophiles in SN2 mechanism.

9) option B is correct

Explanation: simple alkyl halide or primary alkyl halide is the best substrate in SN2 mechanism.

10) option D is correct

Explanation: CrO3, H2SO4 and H2CrO4 are strong oxidizing agents and converts primary alcohol to carboxylic acid.

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