(a) Draw the structure of cis-CH3-CH=CH-CH2CH3 showing the pi bond with its proper geometry. (b) Circle the...

Question:

(a) Draw the structure of cis-CH3-CH=CH-CH2CH3 showing the pi bond with its proper geometry.
(b) Circle the six coplanar atoms in this compound.
(c) Draw the trans isomer, and circle the coplanar atoms. Are there still six?
(d) Circle the coplanar atoms in the following structure.