poate ai vrut sa scrii C7H16 (heptan) si NU C4H16.....
CH3-CH2-CH2-CH2-CH2-CH2-CH3 , n-heptan
CH3-CH-CH2-CH2-CH2-CH3
CH3 , 2-metilhexan
CH3-CH2-CH-CH2-CH2-CH3
CH3 , 3-metilhexan
CH3
CH3-C-CH2-CH2-CH3
CH3 , 2,2-dimetilpentan
CH3
CH3-CH-CH-CH2-CH3
CH3 , 2,3-dimetilpentan