Organic Chemistry Interactive Quiz

Q1. Assertion & Reason

Assertion (A): In steam distillation, the liquid boils when p = p₁ + p₂. [cite: 6]
Reason (R): Since p₁ is lower than p, the organic liquid vaporizes at a lower temperature than its boiling point. [cite: 8]

(A) Both A and R are correct; R is the correct explanation of A.
(B) Both A and R are correct; R is not correct explanation of A.
(C) A is correct; R is incorrect.
(D) R is correct; A is incorrect.

Correct Answer: A. Because the external pressure is shared, the liquid doesn't need to reach its full boiling point pressure alone. [cite: 9]

Q2. Column Chromatography

Identify labels A and B in the separated mixture:

(A) A = b+c, B = c
(B) A = K (constant), B = b+c
(C) A = a, B = b
(D) A = no component, B = a

Correct Answer: A. As the mixture (a+b+c) moves down, components separate into bands based on adsorption. [cite: 27]

Q3. Extraction

Technique where same solvent is repeatedly used:

(A) Continuous extraction
(B) Non-continuous extraction
(C) Differential extraction
(D) Non-differential extraction

Correct Answer: A. Continuous extraction allows efficient recovery using minimal solvent volumes. [cite: 33]

Q4. Boiling Points

Assertion (A): Mixture boils close to but lower than 373 K. [cite: 38]
Reason (R): In presence of insoluble substance, boiling point of water decreases. [cite: 39]

(A) Both A and R are correct; R is the correct explanation of A.
(B) Both A and R are correct; R is not correct explanation of A.
(C) A is correct; R is incorrect.
(D) R is correct; A is incorrect.

Correct Answer: C. The boiling point of water itself doesn't decrease; the system boils lower because of combined vapor pressures. [cite: 43]

Q5. Colour Removal

Used to remove impurities imparting colour:

(A) Activated palladium
(B) Activated charcoal
(C) Activated nickel
(D) All of these

Correct Answer: B. Activated charcoal has a high surface area that adsorbs colored organic impurities. [cite: 48]

Organic Chemistry Quiz