Answer
The structure of each of the given compounds is as follows:
Work Step by Step
a) toluene means one methyl ($CH_{3}$) group is present at benzene ring. o-ethyl means an ethyl group ($-CH_{2}CH_{3}$) is present at ortho to $-CH_{3}$ group in benzene ring. ortho means (1,2) position of the benzene ring.
b) two tertiary butyl groups are present para to each other i.e. opposite to each other i.e. 1,4 position of the benzene ring.
c) two ethyl groups are present at meta to each other i.e. 1,3 position of the benzene ring.
d) 'but' means 4 C. Draw 4 C in straight chain and numbering them from 1 to 4. Add Phenyl ($-C_{6}H_{5}$) group at C1 position and place a double bond between C2 and C3 carbon to get the structure. Remaining valency of C atoms is filled with H.
