NEET Organic Chemistry Some Basic Principles and Techniques — Set 2

Question 1

What is the total number of $ \sigma $ bonds in $ \ce{CH3CH2CH=CH2} $?

Accepted Answer

In $ \ce{CH3CH2CH=CH2} $ (but-1-ene), there are 11 $ \sigma $ bonds: 8 C-H, 2 C-C, 1 from C=C.

Question 2

In the Dumas method, 0.35 g of a compound gave 90 mL of $ \ce{N2} $ at STP, and in Carius method, 0.35 g gave 0.574 g of $ \ce{AgBr} $. What is the percentage of nitrogen?

Accepted Answer

Mass of N = $ \frac{28}{22400} \times 90 = 0.1125 $ g. Percentage = $ \frac{0.1125}{0.35} \times 100 = 32.14\% \approx 32\% $. Carius data is for bromine, not relevant here.

Question 3

Which reagent is used in the Carius method to oxidize the organic compound?

Accepted Answer

Fuming nitric acid ($ \ce{HNO3} $) is used in the Carius method to oxidize the compound and convert halogens to their respective acids.

NEET Chemistry: Organic Chemistry Some Basic Principles and Techniques — Practice Set 2

Q1. What is the total number of \( \sigma \) bonds in \( \ce{CH3CH2CH=CH2} \)?

Q2. In the Dumas method, 0.35 g of a compound gave 90 mL of \( \ce{N2} \) at STP, and in Carius method, 0.35 g gave 0.574 g of \( \ce{AgBr} \). What is the percentage of nitrogen?

Q3. Which reagent is used in the Carius method to oxidize the organic compound?

Q4. Which carbon in \( \ce{CH3CH2C(=O)CH2CH3} \) is most stabilized by the hyperconjugation effect if it forms a carbocation?

Q5. Which of the following is a homologous series?

Q6. A hydrocarbon with 9 \( \sigma \) bonds produces 5 moles of \( \ce{CO2} \) per mole upon combustion. What is its molecular formula?

Q7. In Lassaigne’s test, the presence of sulphur is confirmed by the formation of a violet color with which reagent?

Q8. Which compound has the functional group \( \ce{-CHO} \)?

Q9. An organic compound with \( \ce{C5H8} \) has a degree of unsaturation of 2. Which functional group combination could it contain?

Q10. Which purification method would fail to separate a mixture of two organic solids with identical sublimation temperatures but different solubilities in water?