Question

Select the compound which possesses highest octane number and highest cetanenumber out of n-heptane, n-octane and isooctane. 

Answer 1

Octane number:
n-heptane → 00
n-octane → 60
isooctane →100
Cetane number:
n-heptane → 100
n-octane → 00
isooctane → 60 

∴ The highest octane number is of n-heptane and highest octane number is of isooctane.