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

Which of the following structures (a-d) is another resonance structure of the following organic molecule?  

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

Why would concentrated hydrobromic acid be an inappropriate catalyst for the dehydration of alcohols?    

Which of the following statements is not correct?  

When a small amount of hexanoic acid [CH3(CH2)4CO2H, pKa~4.8], is added to a separatory funnel which contains the organic solvent diethyl ether and water with a pH of 12.0, it is found mainly in the ________ phase as ________.  

What would be the net change in bonds if one mole of 3-hexyne is treated with 2 moles of H2 in the presence of platinum?  

Which of the following reagents will convert 1-butanol to 1-chlorobutane?  

Consider the three-step mechanism for the reaction of A through intermediates B and C to produce D shown below.   A → B       Ea = 15 kcal/mol, ΔH° = 13 kcal/mol B → C       Ea = 10 kcal/mol, ΔH° = -6 kcal/mol C → D       Ea = 2 kcal/mol, ΔH° = -20 kcal/mol   Which of the three steps is rate-limiting?  

Assuming a chair conformation, which of the following configurations will always have both methyl groups in relative axial/equatorial positions?