Answer
The structural formulas of the given compounds are as follows:
Work Step by Step
a) 'hept' means 7 C. so, draw 7 C in straight chain and numbering them from 1 to 7. Now, '2,2-dimethyl' means two no. of methyl groups are present at C2 position. Add two $CH_{3}$ groups at C2 position. ending name is 'ane' i.e. all bonds here are single bonds. Remaining valency of C atoms are filled with H.
b) 'hept' means 7 C. so, draw 7 C in straight chain and numbering them from 1 to 7. Now, '2,3-dimethyl' means two no. of methyl groups are present at C2 and C3 position respectively. Add $CH_{3}$ at C2 and C3 position respectively. ending name is 'ane' i.e. all bonds here are single bonds. Remaining valency of C atoms are filled with H.
c) 'hept' means 7 C. so, draw 7 C in straight chain and numbering them from 1 to 7. Now, '3,3-dimethyl' means two no. of methyl groups are present at C3 position. Add two $CH_{3}$ groups at C3 position. ending name is 'ane' i.e. all bonds here are single bonds. Remaining valency of C atoms are filled with H.
d) 'hept' means 7 C. so, draw 7 C in straight chain and numbering them from 1 to 7. Now, '2,4-dimethyl' means two no. of methyl groups are present at C2 and C4 position respectively. Add two $CH_{3}$ groups at C2 and C4 position respectively. ending name is 'ane' i.e. all bonds here are single bonds. Remaining valency of C atoms are filled with H.
