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