Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.

Classify the following groups as activating or deactivating with respect to further electrophilic substitution of aromatic ring:
(a) – Cl    (b) -CN
(c) – NH₂ (d) –SO₃H
(e) –NO₂ (f) – CH₃.

Define Wurtz Reaction?

What is lindane?

Last traces of water can be removed from benzene by using sodium metal. Why?

What is paraffinic petroleum and asphaltic petroleum?

What is solvent naphtha? What is its true?

68.

What is knocking?

Name the scale for measuring the quality of gasoline. 

What is the octane number of:
(i) n-heptane     (ii) iso-octane?