POC-III Quiz 1 Heterocycles

Pyrazole can be obtained by reaction of 1,3-dicarbonyl compound with ___________

• Hydrazine

• Amine

• Ammonia

• Hydrazide

Pyridine undergoes Nucleophilic substitution reaction at position/s

• 2,4,6

• 3,5

• 1

• 2,3,5

For nitration of pyrazole, reagent used is ---------------

• Nitrating mixture

• Acetyl nitrate

• Benzoyl nitrate

• Nitric acid

Which is the most basic heterocycle of the following

• pyridine

• pyrrole

• imidazole

• pyrimidine

Identify the heterocycle in following structure

• Pyrazolidine

• Pyrazoline

• Imidazole

• Pyrazole

Heterocycle not ontaining 2 heteroatoms is

• Imidazole

• Pyrrole

• Oxazole

• Thiazole

Diimine is an intermediate formed in _____________

• Hantzsch synthesis

• Van Leusen reaction

• Radiszewskii reaction

• Robinson Gabriel synthesis

TosMIC is abbreviation used for

• toluenesulfonylmethyl isocyanide

• toluenesulfonylmethyl isochloride

• toluidinesulfonylmethyl isocyanide

• toluenesulfoxymethyl isocyanide

Chichibabin reaction of pyridine results in formation of

• 4-aminopyridine

• 3-aminopyridine

• 2-aminopyridine

• N-aminopyridine

Pyrimidine on reaction with hydrazine results in formation of __________ by __________

• Pyrazole, ring expansion

• Azepine, ring expansion

• Diazepine, ring expansion

• Pyrazole, ring contraction