Select the correct condensed structural formula for the given compounds:
  
 
Answer variants:
\(CH_2=CH(CH_2)_7CH_3\)
\(CH_2=CH_2\)
\(CH_3-(CH)_6C\) \(\equiv CH\)
\(CH_3-C\) \(\equiv CH\)
\(CH_2-CH_3\)
\(CH_3-(CH_2)_4-CH_3\)
  
1. Hexane -
 
2. Propyne -
 
3. Ethene -