Vinylic Alcohol - Organic Chemistry Questions and Answers

This set of Organic Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Vinylic Alcohol”.

1. Which is the vinylic alcohol position in the given diagram?

a) a
b) b
c) c
d) d
View Answer

Answer: c
Explanation: A vinyl halide is clearly a species with a formula H₂C=C(OH)H, in which a halide is directly bound to an olefinic bond.

2. What is the IUPAC name for vinylic alcohol?
a) Ethanol
b) Methanol
c) Ethenol
d) Methenol
View Answer

Answer: c
Explanation: Vinyl alcohol, also called ethenol (IUPAC name), is the simplest enol. Vinyl alcohol or ethenol is CH₂=CH–OH. Ethanol has very ordinary, straightforward behavior, typical of an alcohol. Vinyl alcohol, however, because of its double bond (also referred to as its unsaturation), behaves considerably different.

3. Which of the following is not an isomer of vinylic alcohol?
a) Acetaldehyde
b) Ethylene oxide
c) Ethanol
d) Ethanal
View Answer

Answer: c
Explanation: With the formula CH₂CHOH, vinyl alcohol is an isomer of acetaldehyde/ethanal and ethylene oxide. It is not an isomer of ethanol which has formula CH₃CH₂OH.

4. Which of the statement is not true about vinylic alcohols?
a) Several metal complexes are known that contain vinyl alcohol as a ligand
b) Vinyl alcohol was discovered in the molecular cloud Sagittarius B, using the 12-meter radio telescope
c) It can be formed by elimination of water from ethylene glycol at a temperature of 900 °C and low pressure
d) Vinylic alcohol shows no tautomerism
View Answer

Answer: d
Explanation: Under normal conditions, vinyl alcohol converts (tautomerizes) to acetaldehyde. At room temperature, acetaldehyde (H₃CC(O)H) is more stable than vinyl alcohol (H₂C=CHOH) by 42.7 kJ/mol. This tautomerization can be catalyzed via photochemical process.

5. Polyvinyl alcohol is soluble in which solvent?
a) protic
b) aprotic
c) polar aprotic
d) polar protic
View Answer

Answer: d
Explanation: Polyvinyl alcohol is a water-soluble synthetic polymer obtained by polymerisation of vinyl alcohol.

Subscribe Now: Organic Chemistry Newsletter | Important Subjects Newsletters

6. Which of the following set of reagents can not be used for the following conversion?

a) NaOH
b) R-OH
c) Net₃
d) NaH
View Answer

Answer: d
Explanation: NaH is a strong base and will completely enolise keto form.

7. What will be the product for the given reaction?

a)
b)
c)
d)
View Answer

Answer: a
Explanation: At low temperature hydrogen from adjacent carbonyl group will be removed instead of hydrogen from attached to carbon adjacent to alkyl group (R).

At low temperature hydrogen from adjacent carbonyl group removed instead of hydrogen

8. What will be the product for the given reaction?

a)
b)
c)
d)
View Answer

Answer: b
Explanation: At high temperature hydrogen from attached to carbon adjacent to alkyl group (R) will be removed instead of hydrogen from adjacent carbonyl group will be removed.

9. What is the final product for the given reaction?

a)
b)
c)
d)
View Answer