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