Unit 8: Organic Chemistry — Online MCQ Test
CHEMISTRY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 8: Organic Chemistry with a free chapter-wise online MCQ test.
This chapter covers: The final chapter covers haloalkanes haloarenes alcohols phenols ethers aldehydes ketones carboxylic acids organic compounds containing nitrogen reaction mechanisms name reactions....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Unit 8: Organic Chemistry — Important Questions & Answers
Which halide undergoes nucleophilic substitution most readily in aqueous KOH?
- A. CH3Cl
- B. CH3Br
- C. CH3I
- D. CH3F
Answer: C. CH3I
Iodide is the best leaving group among halides, so CH3I reacts fastest in nucleophilic substitution.
Iodide is the best leaving group among halides, so CH3I reacts fastest in nucleophilic substitution.
The functional group present in alcohols is:
- A. -CHO
- B. -OH
- C. -COOH
- D. -O-
Answer: B. -OH
Alcohols contain the hydroxyl group (-OH) attached to a saturated carbon atom.
Alcohols contain the hydroxyl group (-OH) attached to a saturated carbon atom.
Which of the following gives positive iodoform test?
- A. Methanol
- B. Ethanol
- C. Propanoic acid
- D. Benzyl alcohol
Answer: B. Ethanol
Ethanol is oxidized to acetaldehyde under the test conditions and gives the iodoform reaction.
Ethanol is oxidized to acetaldehyde under the test conditions and gives the iodoform reaction.
Arrange the following in increasing order of boiling point: CH3OCH3, CH3CH2OH, CH3CHO
- A. CH3OCH3 < CH3CHO < CH3CH2OH
- B. CH3CHO < CH3OCH3 < CH3CH2OH
- C. CH3CH2OH < CH3CHO < CH3OCH3
- D. CH3OCH3 < CH3CH2OH < CH3CHO
Answer: A. CH3OCH3 < CH3CHO < CH3CH2OH
Ethanol has hydrogen bonding, giving the highest boiling point, while ether has the lowest due to lack of intermolecular hydrogen bonding.
Ethanol has hydrogen bonding, giving the highest boiling point, while ether has the lowest due to lack of intermolecular hydrogen bonding.
In the Reimer-Tiemann reaction, phenol is converted mainly into:
- A. Benzoic acid
- B. Salicylaldehyde
- C. Anisole
- D. Benzyl alcohol
Answer: B. Salicylaldehyde
Phenol reacts with chloroform and base to introduce a formyl group at the ortho position, forming salicylaldehyde.
Phenol reacts with chloroform and base to introduce a formyl group at the ortho position, forming salicylaldehyde.