Determine if the following pairof molecules is isomers or conformers?

Given the Newman projection of $2_3$,$3_{\mathrm{dimethylbutane}}$ looking down the $C_2–C_3$ bond, where both methyl groups are gauche to each other, estimate the strain energy of this conformation.

Which conformer of ${\mathrm{tert}}^{-}-\mathrm{butylcyclohexanol}$ is the most stable at room temperature?

Given the conformations of ethane: staggered, eclipsed, and gauche, rank them in order of increasing energy.

Determine if the following pair of molecules isisomers or conformers?

Determine if the following pairof molecules is isomers or conformers?

Determine if the following pairof molecules is isomers or conformers?