Which solvent is suitable for an S_N2 reaction mostly? a) ethanol b) acetone c)

Question

Which solvent is suitable for an S_N2 reaction mostly? a) ethanol b) acetone c) water d) water 19. Which one would be the major product of the following reaction? (2R, 3S) 3-Bromo-2-methylpentane + sodium t-butoxide rightarrow a) 2-Methyl-2-pentene b) 3-Methyl-2-pentene c) 2-Methyl-3-pentene d) 3-Methyl-3-pentene 20. Which reaction of alkene would give the alcohol as its product? a) Acid-cat. hydration b) Alkoxymercuration-demercuration c) Bromination d) Free radical reaction with HBr 21. Which of the following compounds will undergo an SN1 reaction most readily? a) (CH3)3CCH2I b) (CH3)3CCI c) (CH3)2CHI d) (CH3)2CHCH2CH2CH2I 22. Given the bond dissociation energies below (in kcal/mol), calculate the overall Delta H Degree and Delta G Degree for the following reaction in kcal/mol: (CH3)3CH + Br2 rightarrow (CH3)3CBr + HBr Bond Dissociation Energy: (CH_3)_3C-H 91 kcal/mol, (CH3))C-Br 65 kcal/mol, Br-Br 46 kcal/mol, H-Br 88 kcal/mol, CH3-Br 70 kcal/mol a) Delta H degree = 16 & Delta G degree > 0 b) Delta H degree = 16 & Delta G degree 0 d) Delta H degree = -16 & Delta G degree

Explanation / Answer

18) Ethanol contains OH- ion which is better leaving group making it stable for CH3-CH2+, hence the correct answer is Option A

Therefore,ethanol will be most suitable for SN2 reactions

19) The anti-zatisev product will be formed, hence the less substituted structure will be formed, hence the correct answer is Option B

20) The acid catalyzed hydration will yield the final product as alcohol

Hence the correct answer is Option A

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