Answer
a) The structural formula of the given compound is written below.
b) The structural formula of the given compound is written below.
c) The structural formula of the given compound is written below.
d) Correct name of the given compound in part a is: 4-ethyl-3-methylheptane.
Correct name of the given compound in part c is: 2,2,3-trimethylhexane
Work Step by Step
a) hex means 6 C in straight chain. 3-isobutyl means one isobutyl group is present at C3 position. ending name is 'ane' i.e. all C-C bonds are single bond.
b) pent means 5 C in straight chain. 2,2,4-trimethyl means three methyl group is present at C2, C2 and C4 position. ending name is 'ane' which means all bonds are single bond.
c) pent means 5 C in straight chain. 2-tert-butyl means one tertiary butyl group is present at C2 position. ending name is 'ane' which means all bonds are single bond.
d) If we consider the longest C atoms straight chain we find that there are 7 C in straight chain and one ethyl group is present at C4 position and one methyl group is present at C3 position as a substituent. So, the correct name of 3-isobutylhexane is : 4-ethyl-3-methylheptane.
Similarly, there are 6 C in the longest straight chain in compound (c) and three methyl groups are present at C2 , C2 and C3 position respectively. So, the correct name of 2-tert-butylpentane is : 2,2,3-trimethylhexane.
Look at the below figure where we can see the numbering of the longest straight chain C atoms.
