Question

Which of the following has lowest octane number?

• A. n- Hexadecane
• B. iso-Octane
• C. n-Hexane
• D. n-Heptane

Answer 1

Answer: (A)

n- Hexadecane

Octane Number:

1) Octane No. decreases with an increase in length of the carbon chain.

2) For same no. of carbons in a compound, octane no. increases as the branching increase.

3) Unsaturated hydrocarbons have higher value of octane number.

4) Cyclic alkanes have a higher value of octane number.

5) The octane number of aromatic compounds is exceptionally high.

Out of the given compounds, n-Hexadecane has longest chain of carbon in it.

Hence, option "A" is the correct answer.