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46 Questions around this concept.
Identify the reagent(s) 'A' and condition(s) for the reaction
What products are formed when the following compound is treated with Br2 in the presence of FeBr3?

The reaction of toluene with Cl2 in presence of FeCl3 gives X and reaction in presence of light gives 'Y'. Thus, 'X' and 'Y' are
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Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. A reacts with Br2 to form product B. A and B are respectively :
The major product obtained in the photo catalysed bromination of 2-methylbutane is:
Identify correct A, B and C in the reaction sequence given below :

The increasing order of nitration of the following compounds is :

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Benzene undergoes chlorination when it is treated with chlroine in presence of Lewis catalyst such as AlCl3 or Fe or FeCl3 and in absence of light.
For example:

Mechanism
The mechanism of this reaction follows two step:

NOTE: The hydrogen is removed by the AlCl−4 ion which was formed in the first stage. The aluminum chloride catalyst is re-generated in this second stage.
Nitration
Benzene undergoes nitration when treated with concentrated nitric acid in the presence of concentrated sulphuric acid, i.e, nitrobenzene is formed. The reaction is carried out at 313-323 K when one of the H atom from the benzene ring is replaced by the nitro group.
For example:

Sulphonation
Benzene forms benzene sulphonic acid with hot concentrated sulphuric acid or with fuming sulphuric acid (oleum). The attacking electrophile in the reaction is Sulphur trioxide
For example:

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