Chemistry - STRUCTURAL ISOMERISM Question with Solution | TestHub

The structure given in question is in staggered form. Hence, the two planes are$120°$apart.
Given difference in angle of$\mathrm{H}-\mathrm{C}-\mathrm{H}$bond is$29.$
$\therefore \mathrm{ }\mathrm{T}\mathrm{h}\mathrm{e}\mathrm{ }\mathrm{d}\mathrm{i}\mathrm{h}\mathrm{e}\mathrm{d}\mathrm{r}\mathrm{a}\mathrm{l}\mathrm{ }\mathrm{a}\mathrm{n}\mathrm{g}\mathrm{l}\mathrm{e}\mathrm{ }\mathrm{w}\mathrm{i}\mathrm{l}\mathrm{l}\mathrm{ }\mathrm{b}\mathrm{e}\mathrm{ }120°+29°=149°$