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The cyclopentane ring is the parent chain; either bromine-bearing carbon could be carbon #1; the stereochemistry is trans (E).
The cyclohexane is the parent; the isopropyl group is bonded to carbon #1 since iso is alphabetically before methyl.
Either cyclopentane ring is the parent; the cyclopentylmethyl group is simply a substituent.
The heptane chain is the parent; the lowest number sequence is generated with the two methyl groups bonded to carbon #2.
The cyclopropane is the parent; carbon #1 bears the chlorine and the stereochemistry is trans (E).
The cyclobutane chain is the parent; the two methyl groups are bonded 1-3, relative to each other, and the stereochemistry is E or trans.
The cyclooctane ring is the parent (8 carbons) with the hexyl residue bonded to carbon #1.
The cyclopentane ring is the parent; the methyl- has higher priority than the nitro-group alphabetically and the stereochemistry is cis (Z).
The cyclohexane is the parent; the two bromines are 1,2 relative to each other and the stereochemistry is trans (E).
