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Octane number of i-octane is zero.

Octane number of paraffins increases with increasing number of carbon atoms.

Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms.

The aromatics have lower octane number than naphthenes with same number of carbon atoms.

lubricating oil

diesel

kerosene

petrol

decolorises & stabilises cracked gasoline.

desulphurise straight run gasoline & kerosene.

adsorb arsenic from feedstock to catalytic reforming.

all (a), (b) & (c).

R-COOH

R-S-H

R-S-R

R-S-R’

causes olefins to combine with each other.

causes olefins to combine with iso-paraffins.

converts iso-paraffin into olefin.

converts olefin into paraffin.