Chemistry - STEREO ISOMERISM Question with Solution | TestHub

All four bridgehead carbons carry the same substituent ($\mathrm{C}{\mathrm{H}}_3$), and the four remaining positions of the cage are likewise identical. The molecule therefore has the full tetrahedral symmetry of adamantane itself : every bridgehead arrangement is superimposable on every other by a rotation of the cage. With no stereogenic element at all, the compound is achiral and exists as a single stereoisomer. (The 2^(n) rule does not even begin to apply, since none of the bridgeheads carries four different groups.)