Question

Total no. of compound which are not possible? $PC{I}_5$,$NC{I}_5$, $O{F}_4$, $O{F}_2$, $S{F}_4$, $S{F}_6$, $P{H}_5$, $Xe{H}_4$, $Xe{F}_4$, $I{F}_7$, $I{H}_5$, $P{Br}_6^{-}$, $Cl{F}_3$

Answer 1

$\bullet PC{l}_5$ exists

$\bullet NC{l}_5$ deesuot exist (absence of $d-$orbital to from $5$ bonds)

$\bullet O{F}_4$ daxruat exist ($d$ orbital absent)

$\bullet O{F}_2$ exists

$\bullet S{F}_4$ exists ($d$ orbital present)

$\bullet S{F}_2$ exists ($d$ orbital present)

$\bullet P{H}_5$ exists

$\bullet X_e{H}_4$ doesnote exists ($H$ less $EN$)

$\bullet X_e{F}_4$ exists

$\bullet I{F}_7$ exists

(due to exists due to larger size of iodine atom)

$\bullet LHS$ doemot exist ($H$ Less $EN$)

$\bullet PB{r}_6^{-}$ doemot exists (big size of bromine amian)

$\bullet Cl{F}_3$ exists

So $5$ molecular donet exist