Which one is the best nucleophile among in SN reaction? a) H_2O b) OH ion c) SH

Question

Which one is the best nucleophile among in SN reaction? a) H_2O b) OH ion c) SH ion d) H_2 S Which one would not be a good solvent for SN2 reaction? a) Acetone b) DMSO c) 1-Chlorohexane d) CH_3CN How many transition state(s) are involve in SN1 reaction? a) one transition state b) two transition states c) one step process d) It could have more than two transition states. The major product of the following reaction is 1-Methylcyclohexanol + H_2SO_4 with heat rightarrow a) 1-Methylcyclohexene b) 3-Methylcyclohexene c) Methylenecyclohexene d) 1-methylcyclohexane Which one would be better for SN1 reaction? a) 1-Bromo-3-methylhexane b) 2-Bromo-3-methylhexane c) 3-Bromo-3-methylhexane d) None of these Which of the following alcohols will not oxidize to the corresponding carbonyl compound when reacted with chromic acid like Na_2Cr_2O_7 with H_2SO_4? a) t-Butanol b) 2-methyl-1-hexanol c) trans 2-methylcyclohexanol d) 2-cyclohexylethanol (R) 3-Bromo -3-methylhexane + methanol rightarrow The product has its stereochemistry as a) (R) isomer b) (S) isomer c) racemic mixture d) no stereocenter Which one is the true statement for the reaction, tert-Butanol + 1) NaNH_2, 2) CH_3Br rightarrow a) This is a Williamson ether synthesis b) tert-Butanol is being used as a strong base in this reaction. c) The product of the reaction is an alkene. d) It should give tert butyl bromide as a product. Solvolysis is a) SN1 reaction b) SN2 reaction c) E1 reaction d) E2 reaction

Explanation / Answer

18.b. OH-

OH- is good neucleophile for SN reactions

19. d. CH3CN

good solvent for SN2 is polar aprotic solvent

20.b

In SN1 reaction first for carbocation transition state and than second carbocation react with neucleophile

21.a

22.c

tertiary alkyl halides are favorable for SN1

23. a

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