NEET Organic Chemistry Some Basic Principles and Techniques — Set 19

Question 1

A compound $ \ce{C5H10O} $ shows no reaction with sodium fusion followed by silver nitrate test. Which functional group is most likely present?

Accepted Answer

No reaction with Lassaigne’s test (sodium fusion + $ \ce{AgNO3} $) indicates no halogens. $ \ce{CH3CH2COCH2CH3} $ (pentan-3-one) is a ketone, consistent with $ \ce{C5H10O} $, and lacks halogens.

Question 2

What is the IUPAC name of $ \ce{CH3CH(OH)CH2CH3} $?

Accepted Answer

The compound $ \ce{CH3CH(OH)CH2CH3} $ has 4 carbons, with an -OH group on the second carbon. The longest chain is butane, and the -OH makes it butan-2-ol.

Question 3

Which purification method is most suitable for separating a mixture of two liquids with boiling points of 98°C and 102°C, both miscible in water?

Accepted Answer

Close boiling points (4°C difference) require fractional distillation for effective separation, as simple distillation is insufficient and solubility doesn’t aid here.

NEET Chemistry: Organic Chemistry Some Basic Principles and Techniques — Practice Set 19

Q1. A compound \( \ce{C5H10O} \) shows no reaction with sodium fusion followed by silver nitrate test. Which functional group is most likely present?

Q2. What is the IUPAC name of \( \ce{CH3CH(OH)CH2CH3} \)?

Q3. Which purification method is most suitable for separating a mixture of two liquids with boiling points of 98°C and 102°C, both miscible in water?

Q4. A mixture of two liquids (b.p. 80°C and 85°C) shows an \( R_f \) difference of 0.3 in paper chromatography. Which technique is most efficient for large-scale separation?

Q5. Which method cannot be used to estimate nitrogen in compounds containing nitro groups?

Q6. In the estimation of sulphur, 0.15 g of an organic compound gave 0.505 g of \( \ce{BaSO4} \). What is the percentage of sulphur?

Q7. Which functional group is present in \( \ce{CH3CH2CHO} \)?

Q8. A compound with 10 \( \sigma \) bonds and 2 \( \pi \) bonds has the formula \( \ce{C5H6} \). Which carbon has a bond angle of 180°?

Q9. Which of the following is a free radical?

Q10. Which method is used to estimate nitrogen in an organic compound by converting it to ammonium sulphate?