Anti addition of $\mathrm{Br}{}_2$ in $\mathrm{CCl}{}_4$ is carried out on each alkene below. Select all alkenes that give a meso dibromide.

Anti addition to a symmetrical trans-disubstituted alkene gives the meso dibromide, because the two stereocentres have opposite configuration. (E)-But-2-ene gives meso-2,3-dibromobutane and (E)-hex-3-ene gives meso-3,4-dibromohexane. (Z)-But-2-ene gives the racemic pair, and cyclohexene gives racemic trans-1,2-dibromocyclohexane.