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 , 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?  

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

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?  

Both (E)- and (Z)-3-hexene can be subjected to a hydroboration-oxidation sequence. How are the products from these two reactions related to each other?    

When (2R)-bromobutane reacts with CH3OH and the resulting mixture is examined in a polarimeter, minimal optical activity is discovered. What is the mechanism for the reaction?  

What is the product when 3-methyl-2-pentene is reacted with HBr?