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Which statement is false in case of SI engines

[A].	Increasing the length of the carbon chain increases the knocking tendency	[B].	Centralising the carbon atoms decreases the knocking tendency
[C].	Adding methyl groups to the side of the carbon chain increases the knocking tendency	[D].	Unsaturated aliphatic hydrocarbons show less knocking tendency
[E].	Accetylene has least tendency to knocking

Answer: Option E