4.用系统命名法给下列有机化合物命名-|||-CH3-|||-(1)CH3CH2CHCH2CH3-|||-CH3-|||-(2)C H3CH2CHCHCH3-|||-CH2CH3-|||-(H)_(2)-C(H)_(3)-|||-(3)CH3-|||-(H)_(3)-C-C(H)_(3)-|||-(H)_(2)-C(H)_(3)-|||-(H)_(2)-C(H)_(3)-|||-(4) (H)_(3)-C-C(H)_(3)-|||-(H)_(3)-CH-C(H)_(2)-C(H)_(3)-|||-CH3-|||-(5) (H)_(2)=!=!= CH-C=C(H)_(2)-|||-(6) equiv C-C(H)_(2)-C(H)_(3)