Alkynes
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Alkynes Answer Key
1.
How would you identify an aliphatic unsaturated hydrocarbon as being an alkyne?
- by the presence of at least one triple bond
- by the presence of at least two triple bonds
- by the presence of at least one double bond
- by the presence of at least two double bonds
2.
What is the general formula of alkynes?
- [math]C_nH_(2n-2)[/math]
- [math]C_nH_(2n+2)[/math]
- [math]C_nH_(2n+1)[/math]
- [math]C_nH_(2n -1)[/math]
3.
What would be the IUPAC name of the following compound?
[math]CH-=C-CH_2-C-=CH[/math]
[math]CH-=C-CH_2-C-=CH[/math]
- Pent-2,4-diyne
- Pent-1,4-diyne
- Pent-1,3-diyne
- Pent-1,2-diyne
4.
Which of the following chemical formulas correctly represents a molecule of 1-propyne?
- [math] CH_3 CH_2 CH_3 [/math]
- [math] CH C CH_3 [/math]
- [math] CH_2 CH CH_3 [/math]
- [math] CHCH [/math]
5.
Complete the following chemical reaction:
[math]H - C -= C - H + Cl_2 rarr[/math]
[math]H - C -= C - H + Cl_2 rarr[/math]
- [math]Cl-CH-CH-Cl[/math]
- [math]Cl-CH_2-CH_2-Cl[/math]
- [math]Cl-C-=C-Cl[/math]
- [math](Cl)_2-CH_2[/math]
6.
Which of the following compounds is formed when acetylene is passed through red hot iron or quartz tube at 873 K?
- Benzene
- Ethylene
- Napthalene
- Toluene
7.
What is the common name of the following compound?
[math]CH_3-C-=C-CH_3[/math]
[math]CH_3-C-=C-CH_3[/math]
- Acetylene
- Crotonylene
- Allylene
- Methyl acetylene
8.
Which of the following must react with an alkyne to generate a cis alkene?
- lithium
- ammonia
- a Lindlar catalyst
- bromine
9.
Alkynes are insoluble in water but quite soluble in organic solvents.
10.
To generate a trans alkene from an alkyne, lithium must first be dissolved in liquid ammonia.
- True
- False
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