1. Which of the following is a secondary alcohol?
Answer:
Explanation:
In secondary alcohols, the OH group is attached to a carbon atom that is bonded to two other carbon atoms.
2. Which compound is formed on oxidation of propan-2-ol?
Answer:
Explanation:
Secondary alcohols on oxidation give ketones.
3. Which of the following ethers can be prepared using Williamson ether synthesis?
Answer:
Explanation:
Williamson ether synthesis involves the reaction of an alkoxide ion with a primary alkyl halide.
4. Phenol is less acidic than:
Answer:
Explanation:
The presence of the benzene ring in phenol stabilizes the phenoxide ion, making phenol more acidic than alcohols like ethanol.
5. The IUPAC name for the compound CH3-O-CH2-CH3 is:
Answer:
Explanation:
According to IUPAC nomenclature, ethers are named as alkoxyalkanes.
6. Which of the following reagents can be used to convert phenol to 2,4,6-tribromophenol?
Answer:
Explanation:
In water, bromine reacts with phenol to give 2,4,6-tribromophenol.
7. Which compound on dehydration gives ether as the major product?
Answer:
Explanation:
Dehydration of primary alcohols at lower temperatures predominantly yields ethers.
8. Ethers are generally resistant to:
Answer:
Explanation:
Ethers have no hydrogen attached to the oxygen, making them resistant to oxidation.
9. Anisole is derived from:
Answer:
Explanation:
Anisole has a methoxy group attached to a benzene ring, derived from phenol.
10. Which reagent can distinguish between tertiary alcohol and secondary alcohol?
Answer:
Explanation:
Tertiary alcohols react instantly with Lucas reagent while secondary alcohols take some time.
11. Ethylene glycol is used as:
Answer:
Explanation:
Ethylene glycol lowers the freezing point of water, making it useful as an antifreeze in cooling systems.
12. The reaction of sodium with ethanol produces:
Answer:
Explanation:
Sodium reacts with ethanol to give sodium ethoxide and hydrogen gas.
13. Which of the following compounds can exhibit hydrogen bonding with water?
Answer:
Explanation:
Phenol has an OH group capable of forming hydrogen bonds with water.
14. Which of the following alcohols is used as a disinfectant?
Answer:
Explanation:
Ethanol at 70% concentration is used as a disinfectant.
15. Which of the following is not a method for the preparation of ethers?
Answer:
Explanation:
Kolbe's reaction is used for the synthesis of alkanes, not ethers.
16. The boiling point of alcohols is higher than ethers because of:
Answer:
Explanation:
Alcohols can form intermolecular hydrogen bonds, leading to higher boiling points compared to ethers.
17. Which of the following ethers will react with HI to give 2-iodopropane as a product?
Answer:
Explanation:
Reaction with HI cleaves the ether linkage, giving iodide on the larger alkyl group.
18. Which of the following is a phenolic antiseptic?
Answer:
Explanation:
Phenyl mercuric acetate is a phenolic compound used as an antiseptic.
19. The reaction of phenol with zinc dust gives:
Answer:
Explanation:
Phenol on treatment with zinc dust undergoes reduction to form benzene.
20. Which of the following ethers can form hydrogen bonds among its molecules?
Answer:
Explanation:
Ethers cannot form hydrogen bonds among their own molecules due to the absence of a hydrogen attached to the oxygen atom.