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Alkynes

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Alkynes Answer Key

1. 
How would you identify an aliphatic unsaturated hydrocarbon as being an alkyne?
  1. by the presence of at least one triple bond
  2. by the presence of at least two triple bonds
  3. by the presence of at least one double bond
  4. by the presence of at least two double bonds
 
2. 
What is the general formula of alkynes?
  1. [math]C_nH_(2n-2)[/math]
  2. [math]C_nH_(2n+2)[/math]
  3. [math]C_nH_(2n+1)[/math]
  4. [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]
  1. Pent-2,4-diyne
  2. Pent-1,4-diyne
  3. Pent-1,3-diyne
  4. Pent-1,2-diyne
 
4. 
Which of the following chemical formulas correctly represents a molecule of 1-propyne?
  1. [math] CH_3 CH_2 CH_3 [/math]
  2. [math] CH C CH_3 [/math]
  3. [math] CH_2 CH CH_3 [/math]
  4. [math] CHCH [/math]
5. 
Complete the following chemical reaction:

[math]H - C -= C - H + Cl_2 rarr[/math]
  1. [math]Cl-CH-CH-Cl[/math]
  2. [math]Cl-CH_2-CH_2-Cl[/math]
  3. [math]Cl-C-=C-Cl[/math]
  4. [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?
  1. Benzene
  2. Ethylene
  3. Napthalene
  4. Toluene
7. 
What is the common name of the following compound?

[math]CH_3-C-=C-CH_3[/math]
  1. Acetylene
  2. Crotonylene
  3. Allylene
  4. Methyl acetylene
 
8. 
Which of the following must react with an alkyne to generate a cis alkene?
  1. lithium
  2. ammonia
  3. a Lindlar catalyst
  4. 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.
  1. True
  2. False
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