Write the structural formulae of all the isomers of an alkane with seven C-atoms (C₇H₁₆)

There are 9 isomers for heptane (C₇H₁₆):

a. 2-methyl hexane (isoheptane)

b. n-heptane

c. 3-methylhexane

d. 2,2-dimethylpentane

e. 2,3-dimethylpentane

f. 2,4-dimethylpentane

g. 3,3-dimethylpentane

h. 2,2,3-trimethylbutane

i. 3-ethylpentane