Which of the following reagent is used to distinguish between \((C_2H_5)_2NH\) and \((C_2H_5)_3N\)?
Show Hint
- \(CHCl_3+KOH\)
- \(C_6H_5SO_2Cl\)
- Conc. \(HCl+ZnCl_2\)
- \(NaOH+I_2\)
The Correct Option is B
Solution and Explanation
Hinsberg reagent is used to distinguish primary, secondary and tertiary amines. Hinsberg reagent is: \[ C_6H_5SO_2Cl \] It is also called benzene sulphonyl chloride.
Step 1: Identify the types of amines.
\[ (C_2H_5)_2NH \] is a secondary amine. \[ (C_2H_5)_3N \] is a tertiary amine.
Step 2: Apply Hinsberg test.
Secondary amine reacts with Hinsberg reagent to give sulphonamide. This product is insoluble in alkali because it does not contain acidic hydrogen attached to nitrogen. Tertiary amine does not react with Hinsberg reagent in the same way because it has no \(N-H\) bond.
Step 3: Choose the reagent.
Therefore, the reagent used is: \[ C_6H_5SO_2Cl \] Hence: \[ \boxed{\text{(B) }C_6H_5SO_2Cl} \]
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(iv) (CH3 )3CNH2 (v) C6H5NHCH3 (vi) (CH3CH2 )2NCH3 (vii) m–BrC6H4NH2
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Write IUPAC names of the following compounds and classify them into primary, secondary and tertiary amines.
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(i) In decreasing order of the pKb values: C2H5NH2 , C6H5NHCH3 , (C2H5 )2NH and C6H5NH2
(ii) In increasing order of basic strength: C6H5NH2 , C6H5N(CH3 )2 , (C2H5 )2NH and CH3NH2
(iii) In increasing order of basic strength: (a) Aniline, p-nitroaniline and p-toluidine Exercises Rationalised 2023-24 279 Amines (b) C6H5NH2 , C6H5NHCH3 , C6H5CH2NH2 .
(iv) In decreasing order of basic strength in gas phase: C2H5NH2 , (C2H5 )2NH, (C2H5 )3N and NH3
(v) In increasing order of boiling point: C2H5OH, (CH3 )2NH, C2H5NH2
(vi) In increasing order of solubility in water: C6H5NH2 , (C2H5 )2NH, C2H5NH2 .
How will you convert:
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(ii) Hexanenitrile into 1-aminopentane
(iii) Methanol to ethanoic acid
(iv) Ethanamine into methanamine
(v) Ethanoic acid into propanoic acid
(vi) Methanamine into ethanamine
(vii) Nitromethane into dimethylamine
(viii) Propanoic acid into ethanoic acid?
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