Which is the best leaving group in a substitution reaction of an alkyl halide from the following choices?

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Which is the best leaving group in a substitution reaction of an alkyl halide from the following choices?
Quinine is well-known antimalarial drug from the bark of the cinchona tree. In principle, how many stereoisomers of quinine are possible?
Which diene would be more reactive in a Diels-Alder reaction and why?
The addition of heat and acid to 2-oxocyclopentanecarboxylic acid produces:
Methods of extraction are important for use in industry and research. One of the typical steps in an extraction is the use of either acid or base to treat an unknown mixture. This step is applied in order to:
Dynemicin A (pictured), a potent anti-tumor antibiotic produced by Micromonosporachernisa, is a potential lead compound in anti-cancer research. How many pi (π) bonds does Dynemicin A possess?
What is the major product of the following reaction?
What reagent can be used to convert 2,2-dimethylbutan-1-ol into 2,2-dimethylbutanal?
Which reaction mechanism predominates in the reaction below?
Determine the structure of an unknown compound with the molecular formula C8H12O that has 5 signals in the H NMR spectrum and shows the following IR absorptions: