MCQ
$\pi $ bond is formed
- ABy overlapping of atomic orbitals on the axis of nuclei
- BBy mutual sharing of pi electron
- ✓By sidewise overlapping of half filled $p-$orbitals
- DBy overlapping of $s-$orbitals with $p-$orbitals

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${A_2}(g) + 4{B_2}(g) \rightleftharpoons 2A{B_4}(g)\,;\,\Delta H < 0$
the formation of $AB_4(g)$ will be favoured by
$S{e_2}C{l_2}\xrightarrow{\Delta }SeC{l_4} + Se$
