Nitrogen Containing Organic Compounds MCQs [Organic Chemistry]

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

MCQs-based questions and answers on Nitrogen Containing Organic Compounds in organic chemistry.

Carbylamine reaction proceeds via the intermediate formation of

1. Alkyl isocyanide
2. Dichloro methylene
3. Alkyl carbanion
4. Chloride ion

Question’s Answer: Dichloro methylene

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Which compounds would you use in order to obtain a crystalline derivative of an aromatic amine?

1. Benzoyl chloride
2. Nitrous acid
3. 2, 4-Dinitrophenyl hydrazine
4. None of these

Question’s Answer: Benzoyl chloride

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The reason why phenylamine is a much weaker base than ammonia when each is in aqueous solution is that

1. The benzene ring has a tendency to increase the acidity of its substituent
2. The phenylamine molecule is too large to capture hydrogen ion easily
3. Phenylamine is much less soluble in water than is ammonia
4. The lone pair of electrons on two nitrogen atom of phenylamine is delocalised over the benzene ring

Question’s Answer: The lone pair of electrons on two nitrogen atom of phenylamine is delocalised over the benzene ring

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Reaction at 0°C between aniline, NaNO₂ and HCl is known as

1. Nitration
2. Diazotisation
3. Sandmeyer’s reaction
4. Halogenation

Question’s Answer: Diazotisation

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The decreasing order of the basic character of the amines and ammonia is

1. NH₃ > CH₃NH₂ > C₂H₅NH₂ > C₆H₅NH₂
2. C₆H₅NH₂ > C₂H₅NH₂ > CH₃NH₂> NH₃
3. C₂H₅NH₂> CH₃NH₂ > NH₃ > C₆H₅NH₂
4. CH₃NH₂> C₂H₅NH₂ > C₆H₅NH₂ > NH₃

Question’s Answer: C₂H₅NH₂> CH₃NH₂ > NH₃ > C₆H₅NH₂

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Which on reaction with chloroform and KOH produces carbylamine

1. R₂NH
2. R₃N
3. RNH₂
4. All of A, B, and C

Question’s Answer: RNH₂

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The most basic compound among following

1. p-Nitroaniline
2. Aniline
3. Acetanilide
4. Benzylamine

Question’s Answer: Benzylamine

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Which reagent can make distinction between primary and secondary amine?

1. NaNO₂/HCI
2. NH₃
3. HCI
4. All of A, B, and C

Question’s Answer: NaNO₂/HCI

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A compound with NaOH gives NH₃, it can be _____ .

1. A nitro compound
2. An amine
3. An acid amide
4. A substituted acid amide

Question’s Answer: An acid amide

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a-Amino acetic acid with HNO, forms which of the followings?

1. Oxalic acid
2. Glycolic acid
3. Acetic acid
4. Nitroacetic acid

Question’s Answer: Glycolic acid

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CH₃CH₂-CH₂NH₂ with chloroform and KOH (alc.) forms which of the following?

1. CH₃CH₂CH₂CN
2. CH₃CH₂CH₂NO₂
3. CH₃CH₂CH₂-Cl
4. CH₃CH₂CH₂NC

Question’s Answer: CH₃CH₂CH₂NC

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An aromatic compound containing ‘N’ is insoluble in water and soluble in HCl; with CHCl₃ and KOH alc. Gives obnoxious smell, the compound is

1. Nitrite
2. 1° amine
3. 3° amine
4. 2° amine

Question’s Answer: 2° amine

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Which of the substances react with nitrous acid to give an alcohol?

1. (C₂H3) ₂NH
2. C₂H₅NH₂
3. C₆H₅NH₂
4. Both A and C

Question’s Answer: C₂H₅NH₂

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Which compound will form zwitter ion?

1. Glycine
2. 4-aminophenol
3. 4-amino benzoic acid
4. Acetamide

Question’s Answer: Glycine

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How Ethylamine and amiline can be distinguished?

1. Hinsberg’s tent
2. Carbylamine test
3. Liebermann’s nitrosoamine test
4. Dye test

Question’s Answer: Dye test

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Which compounds contain nitrogen

1. Proteins
2. Diazonium salts
3. Amines
4. All of A, B, and C

Question’s Answer: Amines

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Reactions in which aldehydes and ketones can be converted to amines through catalytic reduction in the presence of ammonia or amine are called

1. Amination
2. Reductive amination
3. Reduction
4. Oxidation

Question’s Answer: Reductive amination

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Which methods is used for the synthesis of primary amine?

1. Kolbe reaction
2. Hofmann reaction
3. Gabrial synthesis
4. None of A, B, and C

Question’s Answer: Gabrial synthesis

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Aniline on reaction with acetyl chloride gives A, which on reaction with Br-water followed by hydrolysis would give

1. 2-bromoaniline and 4-bromoaniline
2. 2,4-dibromoaniline
3. 2,4,6-tribromoaniline
4. 3-bromoaniline

Question’s Answer: 2-bromoaniline and 4-bromoaniline

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Amines can be prepared by reduction of nitriles with hydrogen and catalyst

1. Ni
2. LIAIH₃
3. Ptc
4. All of A, B, and C

Question’s Answer: All of A, B, and C

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Which factors affect the basicity of amine?

1. Effect of substituents
2. Resonance effect
3. Solvent
4. All of A, B, and C

Question’s Answer: All of A, B, and C

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C₆H₅NO₂→C₆H₆ the sequence of steps would be

1. Reduction by sodium stannite
2. Reduction Raney Nickel
3. Reduction by Sn-HCl diazotization followed by reaction with H₃PO₂
4. Reduction by Sn-HC followed by reaction with HCI

Question’s Answer: Reduction by Sn-HCl diazotization followed by reaction with H₃PO₂

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Carbonyl compound + ‘X’ →Schiffs base: what is ‘X’?

1. 1° amine
2. 2° amine
3. 3° amine
4. amide

Question’s Answer: 1° amine

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Which represents benzanilide?

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1. C₆H₅NHCOCH₃
2. CH₃NHCO C₆H₅
3. C₆H₅NHCO C₆H₅
4. CH₃NHCOCH₃

Question’s Answer: C₆H₅NHCO C₆H₅

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Triethylamine though expected to be more basic than diethylamine is actually less basic, this is due to

1. Decrease electron density at ‘N’
2. High volatility of 3° amine
3. Less stabilization of the cation of the 3° amine than the cation of 2° amine
4. Less solubility of 3° amines than 2° amines

Question’s Answer: High volatility of 3° amine

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Which is stronger base?

1. Ammonia
2. Methylamine
3. Dimethylamine
4. Ethylamine

Question’s Answer: Dimethylamine

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The formula C₃H₉N may show _____.

1. 1°, 2° and 3° amine
2. 2° and 3° amines
3. 1° amine only
4. 1° and 2° amines

Question’s Answer: 1°, 2° and 3° amine

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The compound which on reaction with HNO, at room temperature produces an oily compound is

1. Methylamine
2. Diethylamine
3. Triehtylamine
4. Ethylamine

Question’s Answer: Diethylamine

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A quaternary ammonium hydroxide on heating at above 100°C undergoes decomposition to give tertiary amine and alcohol is called

1. Hofmann degradation
2. Reductive elimination
3. Exhaustive methylation
4. Acylation

Question’s Answer: Hofmann degradation

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Which amine is more basic in aqueous media?

1. CH₃NH₂
2. (CH₃)₃N
3. (CH₃)₂NH
4. (CH₃)₄NBr

Question’s Answer: (CH₃)₂NH

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Schiff’s bases are produced by the reaction of aniline with

1. Aldehydes
2. Alcohols
3. Amides
4. Alkyl halides

Question’s Answer: Aldehydes

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C₆H₅CONH₂+ HNO₂ – A+ B; What will be the products?

1. Phenol and ammonia
2. Benzoic acid and ammonia
3. Phenol and nitrogen
4. acid and nitrogen

Question’s Answer: acid and nitrogen

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Why Aniline does not give coupling reaction at pH < 5?

1. Aniline converts into C₆H₅NH₃CI which cannot couple.
2. Diazonium salt converts into C₆H₅-N=N-Cl which cannot couple.
3. Both A. and B.
4. Coupling only takes place in basic medium

Question’s Answer: Aniline converts into C₆H₅NH₃CI which cannot couple.

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Which is the base with lowest pK, value?

1. N≡CCH₂NH₂
2. NH₃
3. Et₃N
4. HO–CH₂CH₂NH₂

Question’s Answer: Et₃N

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Which factors decrease the basicity of aniline?

1. -COOH
2. -SOH
3. -NO
4. All of A, B, and C

Question’s Answer: All of A, B, and C

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