V. (15 pts) Answer the following MC questions about to consider some of the foll

Question

V. (15 pts) Answer the following MC questions about to consider some of the following information relative reaction rates. Questions will ask you + NaBr +NaBr o-H IV O Na 2 mol has a stromg bae. move ete ctro negsthve The energy diagram is for data collected from reaction Ill above. Product analysis found that these relative amounts of product were recovered: i25%- iv exotherm, 1 ii 70% endo thermic iv 1%- Reactants (III) Proaress 21. When comparing reaction I to lI, which statement is true? A1 is faster because 1° RX substrates are better for SN2. B) II is faster because 2° RX substrates are better for SN2. Cl is faster because 1° RX substrates are better for SN1. D) Il is faster because 2° RX substrates are better for Sw1. 22. What is true about reaction Ill? AThe formation of i has the lowest activation energy ByThe endothermic E2 reactions form the slowest. CPThe exothermic SN2 reaction forms the fastest. D) The rate of formation of il is fast enough to dominate over the better stability of i

Explanation / Answer

21. OPTION A. SN2 reactions involve a single-step nucleophilic substitution where there occurs a simultaneous attack of the nucleophile with the cleavage of the leaving group. Here the leaving group is bromide while the incoming nucleophile is iodide. Since the reaction involves a transition state whose stability depends upon the steric hindrance, primary alkanes which offer less hindrance than secondary alkyl chains, I reacts faster than II.

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