Question: The antitumor agent cis-platinum: 
 Options:  <1> It is a flat square complex of Pt (II) with 2 molecules of ammonia and 2 chloride anions located in cis. <2> It is a flat square complex of Pt (IV) with 2 molecules of ammonia and 2 chloride anions located in cis. <3> It is an octahedral complex of Pt (IV) with 2 molecules of ammonia in cis and 4 chloride anions in the other positions. <4> It is an octahedral complex of Pt (II) with 2 chloride anions in cis and 4 ammonia molecules in the other positions. <5> It is an alkene with two Pt atoms in the two cis positions with respect to the double bond.
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