Question 1
Choose the INCORRECT statement.
◦ Diborane is B
2H
6.
◦ B(OH)
3 boric acid is a monoprotic acid.
◦ Being electron deficient makes boron compounds strong Lewis acids.
◦ The B-H-B three-center bond has only two electrons.
◦ Boron is one of several nonmetals in group 13.
Question 2
Choose the INCORRECT statement.
◦ The strong C-C and C-H bonds are very important in organic chemistry.
◦ At standard temperature and pressure graphite is more stable than diamond.
◦ Graphite changes spontaneously but very slowly to diamond.
◦ Pencil lead is a graphite and clay mixture.
◦ No harder substance than diamond is known.