Acetylene is an unsaturated organic compound with the molecular formula C2H2. It contains two carbon atoms bound together by the triple bond at an angle of 180o and two hydrogen atoms attached to carbon atoms. It is precarious and is used as fuel in its pure form. It is a colourless and odourless compound, but commercial grade generally smells unusual due to impurities like phosphine and divinyl sulphide.
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Definition: Acetylene is an unsaturated organic compound with the molecular formula C2H2. It contains two carbon atoms bound together by the triple bond at an angle of 180o and two hydrogen atoms attached to carbon atoms. |
Acetylene Formula Chemistry Questions with Solutions
Q1. What is the formula of acetylene?
(a) C2H4
(b) C2H2
(c) C2H6
(d) None of the above
Answer: (b) C2H2.
Q2. Which of the following methods is used to synthesise acetylene?
(a) Hydrolysis of calcium carbide
(b) Addition of ethene
(c) Both (a) and (b)
(d) None of the above
Answer: (a) Hydrolysis of calcium carbide
Q3. What is the molecular weight of acetylene?
(a) 26.04 g/mol
(b) 17.07 g/mol
(c) 27.04 g/mol
(d) None of the above
Answer: (a) 26.4 g/mol
Q4. How many rotatable bonds are there in acetylene?
(a) Zero
(b) One
(c) Two
(d) None of the above
Answer: (a) Zero
Q5. How many bonds does acetylene have?
(a) 3 σ and 2 π
(b) 4 σ and 3 π
(c) 5 σ and 2 π
(d) 6 σ and 3 π
Answer: (a) 3 σ and 2 π bonds
Q6. What is acetylene made of?
Answer: Acetylene is an unsaturated organic compound with the molecular formula C2H2. It contains two carbon atoms bound together by the triple bond at an angle of 180o and two hydrogen atoms attached to carbon atoms.
Q7. What is the IUPAC name of acetylene?
Answer: The IUPAC name of acetylene is ethyne.
Q8. What are the characteristics of acetylene?
Answer: 1. Acetylene is an unsaturated organic compound with the molecular formula C2H2.
2. It is a colourless gas with a faint garlic-like odour.
3. It burns with a sooty flame.
4. It has zero rotatable bonds.
5. It contains three σ and two π bonds.
Q9. How can we synthesise acetylene?
Answer: We can synthesise acetylene in the following ways.
1. Partial combustion of methane (CH4)
2. Hydrolysis of calcium carbide (CaC2).
3. Dehydrohalogenation of alkyl dihalides (CH2X2).
4. Dehydrohalogenation of vicinal dihalides.
Q10. Is acetylene symmetric?
Answer: Yes, acetylene is a symmetric compound.
Q11. How many bonds does acetylene have?
Answer: Acetylene contains three σ (2 C-H bonds and 1 C-C bond) and two π (between 2 carbon atoms) bonds.
Q12. What is the conjugate acid of acetylene?
Answer: The conjugate acid of acetylene is ethynium.
Q13. What are the applications of acetylene?
Answer: Acetylene is precarious and is used as fuel in its pure form. Some applications of acetylene are mentioned below.
1. It is used in welding.
2. It is used to produce plastics and acrylic acid derivatives.
3. It is used in portable lighting.
4. It is used to produce polyacetylene, the first natural semiconductor.
5. It is used in radiocarbon dating.
Q14. What is the shape of acetylene?
Answer: Acetylene is a linear molecule containing two carbon atoms bound together by the triple bond at an angle of 180o and two hydrogen atoms attached to carbon atoms.
Q15. Match the following.
|
Column A |
Column B |
|---|---|
|
Ethane |
2 sp3 Carbons |
|
Ethylene |
2 sp2 Carbons |
|
Acetylene |
2 sp Carbons |
|
Benzene |
6 sp2 Carbons |
Answer:
|
Column A |
Column B |
|---|---|
|
Ethane |
6 sp2 Carbons |
|
Ethylene |
2 sp Carbons |
|
Acetylene |
2 sp2 Carbons |
|
Benzene |
2 sp3 Carbons |
Practice Questions on Acetylene Formula
Q1. What happens when hydrogen bromide is added to acetylene?
Q2. How can we synthesise acetylene?
Q3. How does a metal react with acetylene?
Q4. What happens when acetylene is treated with sodium metal?
Q5. What is the acetylene formula?
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