Select the correct molecular formula for the given compounds:  
Answer variants:
\(CH_3-CH_2-CH_2-CH_3\)
\(CH_3-(CH_2)_5-Cl\)
\(CH_2=CH-(CH_2)_2-CH_3\)
Lanthanide
1. Butane -
 
2. Pent-1-ene -