Q$\mathrm{.}3($a$)$ Explain the occurrence of the following:

$($i$)$ Cottrell atmosphere ii$)$ Conjugate slip $($iii$)$ Jog

$($b$)$ Show whether the following dissociation reaction is possible or not:

$\frac{a}{2}[011]longrightarrow\frac{9}{2}\left[\begin{array}{ccc}1& 0& 1\end{array}\right]+\frac{9}{2}\left[\begin{array}{cc}1& 0\end{array}\right]$