The shape of ethane $(C_2H_6)$ is........

The number of species from the following carrying a single lone pair on the central atom Xenon is $.....$: $XeF_5^{+}, XeO_3, XeO_2F_2, XeF_5^{-}, XeO_3F_2, XeOF_4, XeF_4$

In which of the following molecules,all bond lengths are not equal?

Among the following,the pair in which the two species are not isostructural is

Based on $VSEPR$ theory,the number of $90^{\circ}$ $F-Br-F$ bond angles in $BrF_5$ is

What is the shape of $AB_4E$ type of molecule according to $\text{VSEPR}$ theory?