Stereoisomerism

Co-ordination complexes can show stereoisomerism square planar complexes of Ma_(2)b_(2) type can show geometrical isomerism but not optical & octahedral complexes of Ma_(2)b_(2)C_(2), Ma_(3)b_(3) Mabcdef etc show stereoisomerism, for e.g. Mabcdef have 15 geometrical isomers & all are optically active so it has 15 pairs of enantiomers thus in totaly it has 30 stereoisomers. (a,b,c,d etc. are monodentate lignads while AB is bidenatate ligand) Which of the following can show geometrical as well as optical isomerism?

Among the carboxylic acid shown below, the ones that exhibit stereoisomerism and also form , cyclic anhydrides on heating are (I) "HOOCCH"(CH_3) CH_2CH_2COOH (II) "HOOCCH"(C_3H_7)COOH (III) "HOOCCH"(C_2H_5)CH_2COOH (IV) "HOOCC"(CH_3)(C_2H_5)COOH

How many stereoisomeric pentabromides will be formed in the following reaction?