NEET Organic Chemistry Some Basic Principles and Techniques — Set 4

Question 1

Which purification technique is most effective for separating a mixture of two liquids, one boiling at 100°C and soluble in water, the other boiling at 120°C and insoluble in water?

Accepted Answer

Differential extraction uses water to dissolve the soluble liquid (b.p. 100°C), separating it from the insoluble one (b.p. 120°C), leveraging solubility over boiling point difference.

Question 2

Which carbon atom in $ \ce{CH2=CH-CH2OH} $ has $ sp^2 $ hybridization?

Accepted Answer

In $ \ce{CH2=CH-CH2OH} $, the carbons in the double bond ($ \ce{CH2=CH} $) are $ sp^2 $ hybridized; the second carbon has three sigma bonds and one pi bond.

Question 3

An organic compound with molecular formula $ \ce{C6H12} $ forms three structural isomers, one of which exhibits geometrical isomerism. What is one possible structure?

Accepted Answer

$ \ce{C6H12} $ can be hexene (e.g., $ \ce{CH3CH2CH2CH=CHCH3} $, hex-2-ene), which shows cis/trans isomerism. Hexene has three main structural isomers: hex-1-ene, hex-2-ene, hex-3-ene.

NEET Chemistry: Organic Chemistry Some Basic Principles and Techniques — Practice Set 4

Q1. Which purification technique is most effective for separating a mixture of two liquids, one boiling at 100°C and soluble in water, the other boiling at 120°C and insoluble in water?

Q2. Which carbon atom in \( \ce{CH2=CH-CH2OH} \) has \( sp^2 \) hybridization?

Q3. An organic compound with molecular formula \( \ce{C6H12} \) forms three structural isomers, one of which exhibits geometrical isomerism. What is one possible structure?

Q4. Which compound with \( \ce{C6H12} \) has a degree of unsaturation of 1 and does not exhibit geometrical isomerism?

Q5. In Kjeldahl’s method, 0.5 g of an organic compound produced ammonia that neutralized 20 mL of 0.1 M \( \ce{H2SO4} \). What is the percentage of nitrogen?

Q6. Which general formula represents alkenes?

Q7. A compound with \( \ce{C4H8O} \) gives a negative Lassaigne’s test for halogens and contains a carbonyl group. What functional group is present?

Q8. Which purification method is most effective for separating a mixture of two solids with identical solubility in water but different sublimation temperatures?

Q9. In the Carius method, 0.22 g of a compound gave 0.431 g of \( \ce{AgCl} \). What is the percentage of chlorine?

Q10. Which technique is used to purify a solid organic compound that sublimes on heating?