KCET2026ChemistryGeneral Organic Chemistry
Statement-I: Nitrogen in pyridine cannot be estimated by Kjeldahl's method. Statement-II: Nitrogen in pyridine changes to ammonium sulphate when heated with conc. H ₂ SO ₄ in Kjeldahl's method. Read the above given statements and choose the correct answer from the given options.
Options
- AStatement I is true but Statement II is false
- BBoth Statement I and Statement II are false
- CBoth Statement I and Statement II are true
- DStatement I is false but Statement II is true
Correct answer
A. Statement I is true but Statement II is false
Step-by-step solution
Kjeldahl's method is not applicable to compounds containing nitrogen in nitro and azo groups, and nitrogen present in the ring (e.g., pyridine, quinoline). This is because the nitrogen in these compounds does not change to ammonium sulphate when heated with concentrated H ₂ SO ₄ under the conditions of this method. Thus, Statement I is true and Statement II is false. Answer: Statement I is true but Statement II is false