CGPET 2018 Solved Paper

1. The given reaction is an Etard reaction, in which toluene reacts with chromyl chloride (CrO2Cl2), to give benzaldehyde. Hence, statement ( 1 ) is correct answer.
2. Nitration of benzene is an example of electrophilic substitution, in which −NO2 group is replaced by hydrogen atoms, attached to the ring. Hence, statement (2) is wrong.
3. AlCl3 is a strong Lewis acid, in Friedel-Craft reaction, it will keep the halide part away from the aromatic ring by making a complex [AlCl3−X]
Thus, the given statement is wrong.
4. Nitration of benzene is carried out by a mixture of HNO3 (conc.) and H2SO4 (conc.).
(i) H2SO4 (conc.) +HNO3 (conc.)─────▸[H2NO3]+.[HSO4]−
(ii) [H2NO3]+ ─────▸NO2++H2O
In this reaction, HNO3 (conc.) behaves as a base.
Thus, statement (iv) is correct.
Hence, statements (2) and (3) are wrong.
Therefore, option (b) is the correct answer.