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Which of the following is the best leaving group?    

A chemist has a compound, C4H9Cl, which he believes to be either n-butyl chloride or t-butyl chloride. He reacts the compound with potassium t-butoxide and gets an alkene, C4H8. He determines that the rate of reaction decreases when the concentration of potassium t-butoxide decreases. Therefore, the original compound was:  

Consider the bond dissociation energies listed below in kcal/mol.   CH3-Br             70 CH3CH2-Br     68 (CH3)2CH-Br  68 (CH3)3C-Br     65   These data show that the carbon-bromine bond is weakest when bromine is bound to a ________.  

Why is ultraviolet light required for radical reactions?  

The following substituents are attached to a cyclohexane ring. Which substituted cyclohexane is correctly named as a “cyclohexyl alkane”?  

Which of the following reagents should be used to convert 3-hexyne to (Z)-3-hexene?  

What is the line-angle structure that corresponds to the condensed structure, HOCH2C(O)CH(CH3)2?

What is the leaving group in the following reaction?  

Which of the following best describes the molecules of a sample of ethane gas at room temperature?  

Which of the following steps always generates a radical as a product of that step? I. InitiationII. PropagationIII. Termination