A solution of (–) –1 – chloro –1 – phenylethane is toluene racemises slowly in the presence of a small amount of SbCl₅, due to the formation of

• carbanion

• Carbene

• Carbocation

• Carbocation

Arrange the following compounds in order of decreasing acidity

• II>IV>I>III

• I>II>III>IV

• III>I>II>IV

• III>I>II>IV

Give simple chemical tests to distinguish between the following pairs of compounds:

(i) Ethanal and Propanal

(ii) Benzoic acid and Phenol

Select the ether among following that yields methanol as one the products on reaction with cold hydroiodic acid

• 1-methoxybutane

• 1-methoxybutane-2-methylpropane

• 2-methoxy-2-methylpropane

• methoxybenzene

An aromatic compound 'A' of molecular formula C₇H₇ON undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions: