Which of the following has the lowest knockin | vedclass

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Question

(C) Knocking is the premature ignition of the fuel-air mixture in an engine,which causes a metallic sound. The knocking property is inversely related

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Aromatic hydrocarbons

Vedclass · Answer

(C) Knocking is the premature ignition of the fuel-air mixture in an engine,which causes a metallic sound. The knocking property is inversely related to the octane rating of the fuel.The order of knocking tendency is: $	ext{Straight chain paraffins} > 	ext{Branched chain paraffins} > 	ext{Olefins} > 	ext{Cycloalkanes} > 	ext{Aromatic hydrocarbons}$.Since aromatic hydrocarbons have the highest octane rating,they exhibit the lowest knocking property.

Column-$I$	Column-$II$
$(i)$ $\text{Benzene} + \text{Conc. } HNO_3 + \text{Conc. } H_2SO_4 \rightarrow \text{Nitrobenzene}$	$(A)$ $\text{Halogenation}$
$(ii)$ $\text{Benzene} + Cl_2 \xrightarrow{\text{Anhy. } AlCl_3} \text{Chlorobenzene}$	$(B)$ $\text{Nitration}$
$(iii)$ $\text{Benzene} + CH_3Cl \xrightarrow{\text{Anhy. } AlCl_3} \text{Toluene}$	$(C)$ $\text{Friedel-Crafts acylation}$
$(iv)$ $\text{Benzene} + CH_3COCl \xrightarrow{\text{Anhy. } AlCl_3} \text{Acetophenone}$	$(D)$ $\text{Friedel-Crafts alkylation}$

Which of the following has the lowest knocking property?

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