1. Which of the following is a primary alcohol?
Answer:
Explanation:
In a primary alcohol, the carbon atom bonded to the -OH group is attached to only one other carbon atom.
2. Phenol is more acidic than alcohol due to:
Answer:
Explanation:
The negative charge on oxygen in the phenoxide ion (after losing a proton) is delocalized over the benzene ring due to resonance, making phenol more acidic than alcohols.
3. Which of the following ethers can exhibit isomerism?
Answer:
Explanation:
Ethyl methyl ether can exist as structural isomers (ethyl methyl ether or methyl ethyl ether).
4. The IUPAC name of CH3-O-CH2-CH3 is:
Answer:
Explanation:
According to IUPAC nomenclature, ethers are named as alkoxy alkanes.
5. The dehydration of alcohols to produce alkenes is catalyzed by:
Answer:
Explanation:
Concentrated H2SO4 removes a molecule of water from alcohols to produce alkenes.
6. Among the following, the compound that will not react with Lucas reagent is:
Answer:
Explanation:
Lucas reagent (ZnCl2 in conc. HCl) does not react with primary alcohols like ethanol at room temperature.
7. The reaction of phenol with zinc dust produces:
Answer:
Explanation:
This is a reduction reaction where the -OH group of phenol gets removed with the help of zinc dust.
8. Anisole is derived from:
Answer:
Explanation:
Anisole is methoxybenzene, derived from phenol.
9. Ethers can be prepared by the reaction of an alcohol with:
Answer:
Explanation:
This is the dehydration reaction of alcohols in the presence of an acid to form ethers.
10. The major product formed on the reaction of propene with water in the presence of an acid is:
Answer:
Explanation:
The reaction follows Markovnikov's rule where the proton adds to the less substituted carbon.
11. Which of the following is not a method of preparation of phenols?
Answer:
Explanation:
Grignard reagents are typically not used for the preparation of phenols.
12. The reaction of ethyl alcohol with sodium metal produces:
Answer:
Explanation:
Alcohols react with sodium to produce alkoxides.
13. Which of the following is more soluble in water?
Answer:
Explanation:
Ethanol can form hydrogen bonds with water, making it more soluble.
14. Which of the following is a tertiary alcohol?
Answer:
Explanation:
In T-butanol, the carbon attached to the -OH group is bonded to three other carbon atoms.
15. Which of the following ethers can give a positive Iodoform test?
Answer:
Explanation:
Iodoform test is given by those compounds having a CH3-O group. Anisole fits this criterion.
16. Ethylene glycol is used as:
Answer:
Explanation:
Ethylene glycol is used in car radiators as an antifreeze.
17. The oxidation of primary alcohols produces:
Answer:
Explanation:
Primary alcohols are oxidized to aldehydes using mild oxidizing agents.
18. Williamson synthesis is employed for the preparation of:
Answer:
Explanation:
It involves the reaction of an alkyl halide with an alcohol in the presence of a base.
19. Which of the following is not a phenolic compound?
Answer:
Explanation:
Aniline is an amine, not a phenol.
20. Lucas test is used to distinguish between:
Answer:
Explanation:
Lucas test differentiates alcohols based on their reactivity with the Lucas reagent.