Select the correct condensed structural formula for the given compounds:
Answer variants:
\(CH_2=CH-(CH_2)_4-CH_3\)
\(CH_2=C-O-CH_3\)
\(CH_3-(CH_2)_9C\) \(\equiv CH\)
\(CH_3-CH_2-CH_2-CH_2-CH_2-CH_2-CH_3\)
\(CH_2-CH_3\)
\(CH_3-C\) \(\equiv CH\)
1. Heptane -
2. Propyne -
3. 1-Heptene -