NEET Organic Chemistry Some Basic Principles and Techniques — Set 6

Question 1

In the estimation of sulphur, sulphur is converted to which compound for precipitation?

Accepted Answer

In the Carius method, sulphur is oxidized to $ \ce{H2SO4} $, which reacts with $ \ce{BaCl2} $ to form $ \ce{BaSO4} $ for estimation.

Question 2

A compound with molecular formula $ \ce{C4H10O} $ is a functional isomer of $ \ce{CH3CH2CH2CH2OH} $ and lacks a hydroxyl group. What is its IUPAC name?

Accepted Answer

$ \ce{CH3CH2CH2CH2OH} $ (butan-1-ol) is an alcohol. Its functional isomer without -OH is $ \ce{CH3CH2OCH2CH3} $ (diethyl ether), an ether.

Question 3

In the Dumas method, 0.32 g of a compound gave 80 mL of $ \ce{N2} $ at STP. What is the percentage of nitrogen?

Accepted Answer

Mass of N = $ \frac{28}{22400} \times 80 = 0.1 $ g. Percentage = $ \frac{0.1}{0.32} \times 100 = 31.25\% \approx 31\% $.

NEET Chemistry: Organic Chemistry Some Basic Principles and Techniques — Practice Set 6

Q1. In the estimation of sulphur, sulphur is converted to which compound for precipitation?

Q2. A compound with molecular formula \( \ce{C4H10O} \) is a functional isomer of \( \ce{CH3CH2CH2CH2OH} \) and lacks a hydroxyl group. What is its IUPAC name?

Q3. In the Dumas method, 0.32 g of a compound gave 80 mL of \( \ce{N2} \) at STP. What is the percentage of nitrogen?

Q4. Which purification method is least suitable for separating a mixture of two solids with identical melting points but different \( R_f \) values in chromatography?

Q5. Which technique is most suitable for separating a mixture of \( \ce{C6H6} \) (b.p. 80°C) and \( \ce{C7H8} \) (b.p. 110°C)?

Q6. Which technique is most suitable for separating a mixture of two solids, one of which is soluble in ethanol and the other insoluble, both with high melting points?

Q7. Which carbon in \( \ce{CH3CH2CH2C(=O)CH3} \) experiences the greatest inductive effect from the oxygen atom?

Q8. What is the IUPAC name of \( \ce{(CH3)2CHCH2OH} \)?

Q9. In the estimation of hydrogen, 0.24 g of a compound gave 0.108 g of \( \ce{H2O} \). What is the percentage of hydrogen?

Q10. Which carbon in \( \ce{CH3C#N} \) has the highest electronegativity?