C. A wide variety of functional groups into the aromatic ring, many of which cannot be introduced by direct substitution methods
14.
One key reason diazonium salt chemistry is so valuable is that it allows chemists to synthesize substituted benzene derivatives with functional groups placed at positions that would be difficult or impossible to achieve through:
A.
Direct electrophilic substitution reactions on benzene
B.
Any reaction involving an amine group
C.
Simple oxidation of the aromatic ring
D.
The use of any nitrogen-containing reagent whatsoever
B. Displacement of the nitrogen atoms (with loss of Nā gas) or retention of the diazo group (as in coupling reactions)
16.
The Sandmeyer reaction converts a diazonium salt into an aryl chloride or aryl bromide by treatment with cuprous chloride (CuCl) or cuprous bromide (CuBr), which acts as a:
A.
Oxidizing agent that converts the diazonium salt into a nitro compound
B.
Reducing agent that converts the diazonium salt into an amine
C.
Simple solvent with no catalytic role
D.
Catalyst that facilitates the substitution of the diazonium group by the halide
D. Catalyst that facilitates the substitution of the diazonium group by the halide
17.
The Gattermann reaction, which is similar in outcome to the Sandmeyer reaction (introducing -Cl or -Br onto the ring), uses which catalyst instead of a cuprous halide?
A.
Zinc dust along with acetic acid
B.
Iron powder along with sulphuric acid
C.
Platinum black along with nitric acid
D.
Copper powder along with the corresponding halogen acid (HCl or HBr)
