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Compounds Containing Nitrogen question

2025 · 28 Jan · Shift 2 · Q15
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  5. /2025 · 28 Jan · Shift 2 · Q15

Compounds Containing Nitrogen question

2025 · 28 Jan · Shift 2 · Q15

JEE MainChemistryCompounds Containing NitrogenMCQ+4 / −1
Identify correct statements : (A) Primary amines do not give diazonium salts when treated with NaNO2\mathrm{NaNO}_2NaNO2​ in acidic condition. (B) Aliphatic and aromatic primary amines on heating with CHCl3\mathrm{CHCl}_3CHCl3​ and ethanolic KOH form carbylamines. (C) Secondary and tertiary amines also give carbylamine test. (D) Benzenesulfonyl chloride is known as Hinsberg's reagent. (E) Tertiary amines reacts with benzenesulfonyl chloride very easily. Choose the correct answer from the options given below :
  1. A
    (B) and (C) only
  2. B
    (D) and (E) only
  3. C
    (A) and (B) only
  4. D
    (B) and (D) only
View written solutionFree

Correct answer: D

  1. Statement (A): Primary amines do not give diazonium salts when treated with NaNO2\mathrm{NaNO_2}NaNO2​ in acidic condition.

    This statement is false.

    • Aromatic primary amines react with nitrous acid (generated from NaNO2+HCl\mathrm{NaNO_2 + HCl}NaNO2​+HCl) at low temperature to form diazonium salts.
    • Example: C6H5NH2+NaNO2+2HCl→C6H5N2+Cl−+NaCl+2H2O\mathrm{C_6H_5NH_2 + NaNO_2 + 2HCl \rightarrow C_6H_5N_2^+Cl^- + NaCl + 2H_2O}C6​H5​NH2​+NaNO2​+2HCl→C6​H5​N2+​Cl−+NaCl+2H2​O

    Hence, primary amines can give diazonium salts (especially aromatic primary amines).

  2. Statement (B): Aliphatic and aromatic primary amines on heating with CHCl3\mathrm{CHCl_3}CHCl3​ and ethanolic KOH form carbylamines.

    This statement is true.

    This is the carbylamine test: RNH2+CHCl3+3KOH→RNC+3KCl+3H2O\mathrm{RNH_2 + CHCl_3 + 3KOH \rightarrow RNC + 3KCl + 3H_2O}RNH2​+CHCl3​+3KOH→RNC+3KCl+3H2​O

    Both aliphatic and aromatic primary amines give this test.

  3. Statement (C): Secondary and tertiary amines also give carbylamine test.

    This statement is false.

    Only primary amines respond to the carbylamine test. Secondary and tertiary amines do not form isocyanides.

  4. Statement (D): Benzenesulfonyl chloride is known as Hinsberg's reagent.

    This statement is true.

    Benzenesulfonyl chloride is indeed called Hinsberg's reagent and is used to distinguish primary, secondary, and tertiary amines.

  5. Statement (E): Tertiary amines reacts with benzenesulfonyl chloride very easily.

    This statement is false.

    Tertiary amines do not react readily with benzenesulfonyl chloride because they do not have a replaceable hydrogen attached to nitrogen.


Correct statements

The true statements are: (B) and (D)\boxed{(B) \text{ and } (D)}(B) and (D)​

So the correct option is: D\boxed{\text{D}}D​


Comparison with stored answer

Stored correct answer: D

My derived answer: D

They agree.

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