NEET Organic Chemistry Some Basic Principles and Techniques — Set 9

Question 1

In Kjeldahl’s method, 0.36 g of a compound produced ammonia that neutralized 25 mL of 0.1 M $ \ce{H2SO4} $. What is the percentage of nitrogen?

Accepted Answer

Moles of $ \ce{H2SO4} $ = $ 0.025 \times 0.1 = 0.0025 $. Moles of $ \ce{NH3} $ = 0.005 (2H per $ \ce{H2SO4} $). Mass of N = $ 0.005 \times 14 = 0.07 $ g. Percentage = $ \frac{0.07}{0.36} \times 100 \approx 19.44\% $, which rounds to 19%.

Question 2

What is the hybridization of the carbon atom in $ \ce{CH3COOH} $ that is double-bonded to oxygen?

Accepted Answer

In $ \ce{CH3COOH} $ (acetic acid), the carbonyl carbon ($ \ce{C=O} $) has three sigma bonds (to O, OH, and CH3) and one pi bond, indicating $ sp^2 $ hybridization.

Question 3

Which carbon in $ \ce{CH3CH2CH=CH2} $ has $ sp^2 $ hybridization?

Accepted Answer

In $ \ce{CH3CH2CH=CH2} $, the third carbon ($ \ce{CH=} $) is part of the double bond, with three sigma bonds and one pi bond, indicating $ sp^2 $ hybridization.

NEET Chemistry: Organic Chemistry Some Basic Principles and Techniques — Practice Set 9

Q1. In Kjeldahl’s method, 0.36 g of a compound produced ammonia that neutralized 25 mL of 0.1 M \( \ce{H2SO4} \). What is the percentage of nitrogen?

Q2. What is the hybridization of the carbon atom in \( \ce{CH3COOH} \) that is double-bonded to oxygen?

Q3. Which carbon in \( \ce{CH3CH2CH=CH2} \) has \( sp^2 \) hybridization?

Q4. In the Dumas method, nitrogen is estimated by measuring the volume of which gas at STP?

Q5. A compound with molecular formula \( \ce{C4H8O2} \) is a functional isomer of \( \ce{CH3CH2COOH} \) and contains an ester group. What is its IUPAC name?

Q6. In the Carius method, 0.3 g of a compound gave 0.574 g of \( \ce{AgBr} \). What is the percentage of bromine?

Q7. How many \( \pi \) bonds are present in \( \ce{CH3CH=CHCH=CH2} \)?

Q8. Which technique separates components based on their adsorption on a solid surface?

Q9. Which of the following has the highest number of \( \pi \) bonds?

Q10. In the Carius method, 0.15 g of a compound gave 0.287 g of \( \ce{AgCl} \). If the same sample in Kjeldahl’s method neutralized 10 mL of 0.1 M \( \ce{H2SO4} \), what is the percentage of chlorine?