Answer
:CH3-(CH2)6-CH3 .... condensed formula of Octane (C8H18) Explanations:
The formula for Octane is given by :

STEP 1 : Write down the structural formula of Octane
• The condensed formula can be determined by grouping :
• CH3 -CH2 -CH2-CH2-CH2-CH2 -CH2 -CH3
This can be expressed as :
CH3-(CH2)6-CH3 .... condensed formula of Octane (C8H18)