structures are given below in the picture.
Structural formula identify the location of chemical bonds between the atoms of a molecule.
As the structural formula consists of symbols for the atoms connected by short lines that represents chemical bonds - one ,two , or three lines standing for single ,double or triple bonds ..
a) 3-methyl heptaneheptane
in this , 7 carbons chain contain methyl on the 3 position.
b) 1,3-diethylcyclohexane
Cyclic hexane contains two ethyl group at two different positions .
c) 3-ethyl heptane
In this the 7 carbon chain contains ethyl on 3 position .
d) 3-isopropyl-6- methylcycloheptane.
In this the cyclic heptane contains the methyl group at 6 position and isopropyl at 3 position of the chain .
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