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For SI engines which fuels are preferred?

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For SI engines which fuels are preferred?

(a) Aromatics

(b) Paraffin

(c) Olefins

(d) Napthenes

The question was posed to me in examination.

I need to ask this question from Conventional Fuels topic in portion Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

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The correct option is (a) Aromatics

The best I can explain: For SI engines aromatic fuels are preferred. Aromatic compounds are ring structured. They have a benzene molecule as their central structure and also a general chemical formula is CnH2n-6.

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