Answer
See the answer below.
Work Step by Step
$B.O.=N.\ Shared\ pairs\div N.\ links$
a) CN bond:
$3/1=3$
b) CH bonds
$3/3=1$
CC bond:
$1/1=1$
CN bond:
$3/1=3$
c) SO bonds
$6/3=2$
d) CH bonds:
$6/6=1$
Leftmost CC bond:
$1/1=1$
Rightmost CC bond:
$2/1=2$
