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Select the correct condensed structural formula for the given compounds:
  
 
Answer variants:
CH_3-C \equiv CH
CH_3-(CH)_6C \equiv CH
CH_3=CH_2
CH_3-CH_2-CH_3
CH_2=CH-(CH_2)_2-CH_3
CH_3-(CH_2)_4-CH_2
  
1. Propane -
 
2. Propyne -
 
3. 1-Pentene -