Question

Write down the structures of close homologues of heptane having one quaternary C atom in their molecule and the other having two tertiary carbon atoms.

Answer 1

Heptane is C₇ H_16. 

The homologues of heptane are C₇ H₁₄ and C₈ H_18. 

i. Molecule of hexane having one quaternary C atom:

ii. Molecule of octane having one quaternary C atom:

Note: Other structures with one quaternary may also be formed with octane.

ii. Molecule of hexane having two tertiary c atoms:

Where C–2 and C–3 are 3°C atoms

Molecule of octane having two tertiary C atoms: