Question 1
How many
σ- and
π-bonds, respectively, are there in phenylisothiocyanate, C
6H
5NCS? Ignore the C

H bonds in your counting.
◦ 9 and 5
◦ 8 and 4
◦ 5 and 5
◦ 9 and 2
Question 2
How would replacing one of benzene's C atoms and the H atom attached to it with an N atom (C
5H
5N) affect the delocalized electrons?
◦ The molecule would not be stable.
◦ The N can have delocalized electrons like C.
◦ Only the five C atoms would be included in the delocalized electrons.
◦ There would be no delocalized electrons but a double bond between the N and a C.
◦ There would be no delocalized electrons but a double bond between the N and the C on each side of the N.