Organic Compounds Containing Nitrogen Quiz - ICSE Class 12 Chemistry
Free practice quiz: Organic Compounds Containing Nitrogen (ICSE Class 12 Chemistry). 28 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is the strongest base among the given options?
- Ammonia (NH3)
- Methylamine (CH3NH2)
- Dimethylamine ((CH3)2NH)
- Trimethylamine ((CH3)3N)
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Answer: C. Dimethylamine ((CH3)2NH)
In the gaseous phase, basicity increases with the number of electron-donating alkyl groups. However, in aqueous solution, solvation effects play a crucial role. For methylamines in water, the order of basicity is generally (CH3)2NH > CH3NH2 > (CH3)3N > NH3. Dimethylamine exhibits the best balance of inductive effect and solvation.
When aniline is heated with chloroform in the presence of alcoholic KOH, it forms:
- Phenyl isocyanide
- Aniline hydrochloride
- Diphenylamine
- Ammonia
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Answer: A. Phenyl isocyanide
This is the carbylamine reaction, a characteristic test for primary amines. Aniline, being a primary amine, reacts with chloroform and alcoholic KOH to produce phenyl isocyanide, which has a foul smell.
Diazotization of aniline with NaNO2 and HCl at 0-5°C produces:
- Phenol
- Benzenediazonium chloride
- Nitrobenzene
- Aniline hydrochloride
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Answer: B. Benzenediazonium chloride
Diazotization is the reaction of a primary aromatic amine with nitrous acid (generated in situ from NaNO2 and a strong acid like HCl) at low temperatures (0-5°C) to form a diazonium salt. In this case, aniline reacts with NaNO2 and HCl to form benzenediazonium chloride.
The reaction of an aliphatic primary amine with nitrous acid typically leads to:
- N-nitrosoamine
- Aliphatic diazonium salt
- Alcohol
- Aldehyde
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Answer: C. Alcohol
Aliphatic diazonium salts formed by the reaction of aliphatic primary amines with nitrous acid are very unstable. They readily decompose in the aqueous acidic medium to form alcohols, with the evolution of nitrogen gas. The intermediate formation of an N-nitrosoamine occurs with secondary amines.
The Schotten-Baumann reaction is used for:
- Acylation of amines
- Alkylation of amines
- Nitration of amines
- Diazotization of amines
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Answer: A. Acylation of amines
The Schotten-Baumann reaction is a method for the acylation of amines (both primary and secondary) and alcohols. It typically involves the reaction with an acid chloride or anhydride in the presence of a base (like NaOH) in an aqueous or mixed solvent system.