What is the product B from reaction of furan with intermediate A?

Triflic acid looks like the following: Is it possible to synthesize this material from trifluoromethylbenzene as the major product using the reactions we have learned?

Which of the following o,p-directing groups is most expected to yield primarily a single Friedel-Crafts alkylation?

Of the following strategies for the synthesis of 4-iso-butylanisole, which is expected to be the best route?

From the reaction coordinate shown below, which compound is formed faster, A or B?

What is the Friedel-Crafts product in the following reaction? ++   AlCl3

What is the structure of compound B for the following reaction sequence?

In the following ultraviolet-visible spectrum, what does the maximum absorbance measure?

For the following diagram regarding the enthalpy for the hydrogenation of 1-butene and 1,3-butadiene, which statement is true?

The lowest unoccupied molecular orbital (LUMO) of 1,3-butadiene is best represented by which of the following molecular orbital (MO) diagrams?