Select the correct molecular formula for the given compounds:  
Answer variants:
\(CH_3-(CH_2)_3-COOH\)
\(CH_2-OCO_3-Cl\)
\(CH_3-(CH_2)_5C\) \(\equiv CH\)
\(CH_2=CH-CH_2CH_3\)
1. Oct-1-yne -
 
2. But-1-ene -