Complete the following reaction

Explanation

Reason: `bar(e)`-withdrawing group `(-NO_(2))` stabilises the ring and resists the oxidation of the ring in which `NO_(2)` group is present, so the other ring is oxidised. However, the `bar(e)`-donating `(-NH_(2))` group makes the ring more susceptible to oxidation and the ring in which `(-NH_(2))` group is present is oxidised.
b.
Due to bar(e)-donating resonance effect `(+R)` of the benzene ring, the `bar(e)` density of the

group increases, which in turn increases the `bar(e)` density in the `(C-H)` bond of the aldehyde group. As a result, the `(C-H)` bond becomes strong and hence only stronger oxidising agents such as Tollens regent can oxidise the `(C-H)` bond to `(C-OH)` to form acids, and weaker oxidising agents such as Fehling's and Benedict's solutions fail to oxidise the aromatic aldehydes to acids.
`E_(Ag+//Ag)^(@)=0.80 V`,
`E_(Cu^(2+)//Cu+)^(@)=0.19 V`
Therfore, Tollens regent oxidises aliphatic and aromatic aldehydes but Fehling's and Benedict's solution oxidise only aliphatic aldehydes.
d.
In case of toluene, the (Me) group of toluene is more susceptible to oxidation than the aromatic ring and the product is `PhCOOH`. In beta-methyl naphthalene, the reactive alpha-positions are more easily oxidised than Me, and under these conditions of oxidation, the main product is the quinone as shown above.