Question

Which alkane burns the most efficiently in a combustion engine - tendency for a controlled burn is better than most other fuels? a) cyclopentane b) propane c) heptane (n-heptane) d) hexane e) octane (iso-octane) f) butane g) no correct response

Answer 1

Octane number measures the performance of gasoline. The fuel having high octane number has the high efficiency in a combustion engine.

The octane number is determined by assigning an octane number of 100 to isooctane (isooctane (2,2,4-trimethylpentane)). It is a highly branched compound that burns smoothly, with little knock.

The alkane burns with high efficiency in a combustion engine = iso octane.