Chemistry - STEREO ISOMERISM Question with Solution | TestHub

Check each statement : the highest energy conformer of butane is the fully eclipsed one in which the two methyl groups eclipse each other, not hydrogens - first statement false. The gauche conformer is staggered, not eclipsed - second statement false. Torsional strain is at its maximum, not absent, in eclipsed forms - third statement false. The anti conformer ($\mathrm{C}{\mathrm{H}}_3$ groups 180° apart) is staggered and is the most stable conformer of butane - the last statement is correct.