The Hammond-Leffler Postulate,when Applied to Nucleophilic Substitutions and Elimination Reactions,states

question 90

Multiple Choice

The Hammond-Leffler postulate,when applied to nucleophilic substitutions and elimination reactions,states that:

• A) a negatively-charged nucleophile is stronger than its conjugate acid.
• B) polar aprotic solvents strongly accelerate the rate of S_N2 processes.
• C) bimolecular nucleophilic substitutions are 2^nd order kinetically.
• D) the transition state for an endergonic reaction step (one accompanied by an increase in free energy)resembles the product of that step.
• E) elimination reactions will always compete with nucleophilic substitution reactions.

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