Question

Benzene vapour mixed with air when passed over ${V_2}{O_5}$ catalyst at $500^\circ C$ gives.
A.Oxalic acid
B.Glyoxal
C.Fumeric acid
D.Maleic anhydride

Answer 1

We have to know that, an oxidation is a reaction that eliminates an electron from a substance, decrease is a response that adds electrons to a substance. Decrease is a reaction that eliminates an electron from a substance, oxidation is a response that adds electrons to a substance.

Complete answer:
We have to know that, oxalic acid is a poisonous strong acid ${(COOH)_2}$ oxalic acid is broadly utilized as a corrosive flush in laundries, where it is compelling in eliminating rust and ink stains since it changes over most insoluble iron mixtures into a dissolvable complex particle.
We have to know that Glyoxal is a natural compound with the substance recipe $OCHCHO$ . It is the littlest di-aldehyde. It is glasslike strong, white at low temperatures and yellow close to the softening point $15^\circ C$ .
We have to know that fumaric acid is a natural compound with the recipe $H{O_2}CCH = CHC{O_2}H$ . A white strong, fumaric acid happens broadly in nature. It has an organic product like taste and has been utilized as a food added substance.
We have to know that, Maleic anhydride is utilized in the creation of unsaturated polyester gum just as in the assembling of coatings, pharmaceutics, rural items, surfactants, and as an added substance of plastics.
Benzene, when somewhat oxidized by ${V_2}{O_5}$ , inside the presence of air, adds up to Phenol and when it goes through a cycle of a total oxidation reaction by ${V_2}{O_5}$ , gives Maleic Anhydride.

Therefore, the correct option is (D).

Note:
We have to know that, chronic openness to maleic anhydride has been seen to cause persistent bronchitis, asthma-like assaults, and upper respiratory plot and eye disturbance in laborers. In certain individuals, sensitivities have grown so that lower fixations can presently don't go on without serious consequences.