7.将下列化合物改写为键线式。-|||-CH3 CH3-|||-(1) CH3 CHCH2CHC H(CH3)2-|||-(2) CH3CH2 CH2CCH3-|||-(3) (H)_(3)C(H)_(2)Cequiv CC(H)_(2)C((C{H)_(3))}_(3)-|||-(4)CH3(CH2)2CHClCH 2CH2 O(CH2)2 CH(CH3)2-|||-(5) lt -C(H)_(2)C(H)_(2)C(H)_(2)CH(C(H)_(3))COCl-|||-(6)(C2H5)4C