$XX$ ' has linear geometry as only two atoms are present.

$(b)-(i)$

$XX _3^{\prime}$ has T-shaped geometry as $3$ bond pairs and $2$ lone pairs of electrons are present. The electron pair geometry is trigonal bipyramidal.

$(c)-(iv),$

$XX _5^{\prime}$ has Square - pyramidal geometry as $5$ bond pairs and $1$ lone pair of electrons are present. The electron pair geometry is octahedral.

$(d)-(ii)$

$XX _7^{\prime}$ has pentagonal bipyramidal geometry as $7$ bond pairs and $0$ lone pairs of electrons are present.