Which structure correctly represents the bonding in a hydrocarbon molecule?

a.
6 carbon atoms forming single bonds with 13 hydrogen atoms; the second carbon from the right has a methyl group attached to it
b.
8 carbon atoms forming single bonds with 18 hydrogen atoms; a triple bond exists between the third and fourth carbon atom from the right
c.
four carbon atoms forming single bonds with seven hydrogen atoms; a methyl group forms a single bond with the second carbon from the left
d.
three carbon atoms forming single bonds with seven hydrogen atoms with; a double bond exists between the first and second carbon atom from the right

A.  6 carbon atoms forming single bonds with 13 hydrogen atoms the second carbon from the right has a methyl group attached to it.

Explanation:

Here 6 carbon atoms forming single bonds with 13 hydrogen atoms the second carbon from the right has a methyl group attached to it,has a chemical formula of .

It is in the form of ,Which is the general formula for alkanes.

So here,the formula is ,which is the general formula of Heptane.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole