What are the Br-C1-C2-Br dihedral angles in (i) the diequatorial conformer of trans-1,2-dibromocyclohexane, (ii) the diaxial conformer of trans-1,2-dibromocyclohexane, and (iii) either chair of cis-1,2-dibromocyclohexane (ideal chair geometry)?

1. A(i) $60^{\circ }$, (ii) $180^{\circ }$, (iii) $60^{\circ }$
2. B(i) $180^{\circ }$, (ii) $60^{\circ }$, (iii) $60^{\circ }$
3. C(i) $60^{\circ }$, (ii) $60^{\circ }$, (iii) $180^{\circ }$
4. D(i) $60^{\circ }$, (ii) $180^{\circ }$, (iii) $180^{\circ }$