Unit 17: Organic Compounds Containing Oxygen — Online MCQ Test
CHEMISTRY · NEET (All) · NEET
Practice Unit 17: Organic Compounds Containing Oxygen with a free chapter-wise online MCQ test.
This chapter covers: General methods of preparation properties reactions and uses. ALCOHOLS PHENOLS AND ETHERS Alcohols: Identification of primary secondary and tertiary alcohols: mechanism of dehydrat....
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Unit 17: Organic Compounds Containing Oxygen — Important Questions & Answers
Anisole on cleavage with HI gives:
- A. Iodobenzene and methanol
- B. Phenol and ethyl iodide
- C. Phenol and ethanol
- D. Phenol and methyl iodide
Answer: D. Phenol and methyl iodide
Cleavage of anisole (methoxybenzene) with HI yields phenol and methyl iodide (CH3I) due to the formation of stable phenoxide resonance and methyl carbocation/substitution.
Cleavage of anisole (methoxybenzene) with HI yields phenol and methyl iodide (CH3I) due to the formation of stable phenoxide resonance and methyl carbocation/substitution.
Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give:
- A. Sec. butyl alcohol
- B. Tert. butyl alcohol
- C. Isobutyl alcohol
- D. n-butyl alcohol
Answer: B. Tert. butyl alcohol
Acetone (CH3COCH3) reacting with CH3MgCl (Grignard reagent) followed by hydrolysis gives tert-butyl alcohol (2-methylpropan-2-ol).
Acetone (CH3COCH3) reacting with CH3MgCl (Grignard reagent) followed by hydrolysis gives tert-butyl alcohol (2-methylpropan-2-ol).
The reaction of an alkoxide with an alkyl halide (e.g., Na+O-R + R'-X → R-O-R' + NaX) can be classified as:
- A. Alcohol formation reaction
- B. Dehydration reaction
- C. Williamson alcohol synthesis reaction
- D. Williamson ether synthesis reaction
Answer: D. Williamson ether synthesis reaction
The reaction of a sodium alkoxide with an alkyl halide to form an ether is known as the Williamson ether synthesis.
The reaction of a sodium alkoxide with an alkyl halide to form an ether is known as the Williamson ether synthesis.
Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer?
- A. Ozone
- B. MnO2
- C. Aluminium isopropoxide
- D. Acetone
Answer: D. Acetone
Acetone reacts with cis-1,2-diols to form a cyclic acetonide (a five-membered ring), whereas the trans-isomer cannot form this strained structure.
Acetone reacts with cis-1,2-diols to form a cyclic acetonide (a five-membered ring), whereas the trans-isomer cannot form this strained structure.
The product formed by the reaction of an aldehyde with a primary amine is :
- A. Ketone
- B. Carboxylic acid
- C. Aromatic acid
- D. Schiff base
Answer: D. Schiff base
Reaction of a carbonyl compound (aldehyde or ketone) with a primary amine yields an imine, commonly known as a Schiff base, through a nucleophilic addition-elimination mechanism.
Reaction of a carbonyl compound (aldehyde or ketone) with a primary amine yields an imine, commonly known as a Schiff base, through a nucleophilic addition-elimination mechanism.