The octane number has zero value for

Options

A. Iso-octane
B. n-octane
C. n-heptane
D. Tetra ethyl lead

Explanation

To determine the substance that has an octane number of zero, we can follow these steps:

### Step 1: Understand the Concept of Octane Number
The octane number is a measure of the quality of fuel, specifically its ability to resist knocking during combustion. It is defined based on a mixture of two hydrocarbons: iso-octane and n-heptane.

**Hint:** Remember that the octane number indicates fuel quality and is compared to specific hydrocarbons.

### Step 2: Identify the Reference Hydrocarbons
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