Which among the following concepts is $NOT$ introduced by $V.B.$ Theory?

Which of the following molecules is not linear?

How will you account for the $104.5^{\circ}$ bond angle in water?

Which of the following molecules has a regular geometry as expected?

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false:
$(I)$ The order of repulsion between different pair of electrons is $lp-lp > lp-bp > bp-bp$.
$(II)$ In general,as the number of lone pair of electrons on the central atom increases,the deviation of the bond angle from the normal bond angle increases.
$(III)$ The number of lone pairs on $O$ in $H_2O$ is $2$,while on $N$ in $NH_3$ is $1$.
$(IV)$ The structures of xenon fluorides and xenon oxyfluorides could not be explained on the basis of $VSEPR$ theory.

In which of the following pairs are the two species not isostructural?