Question

Which of the following statements is/are true?
(i) $P{H}_5$ and $BiC{l}_5$ do not exist
(ii) $p\pi -d\pi$ bond is present in $S{O}_2$
(iii) $I_3^{+}$has bent geometry
(iv) $Se{F}_4$ and $C{H}_4$ have same shape

• A. (i), (ii), (iii)
• B. (i), (iii)
• C. (i), (iii), (iv)
• D. (i), (ii), (iv)

Answer 1

Answer: (A)

(i) $P{H}_5$ does not exist because the electrone gativity of $H\&P$ are almost same they should have $s{p}^{3}d$ hybridised but the $H$ cannot distort the $d$ orbital of $P$ hence it is not exist while $BiC{l}_{5}B{i}^{+3}$ is more stable than $B{i}^{+3}$ due to inert inert pair effect and in $BiC{l}_5$ steric crowding also present so it does not exist.
(ii) $S=1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}3d^0$
In exicited state

$p\&d$ orbital of sulphur & $p$ orbital of oxygen involved in $\pi$ bond so $S{O}_2$ has $p\pi -d\pi$ bond

(iii) $I_3^{+}$
$2bp+2lp=s{p}^3$ hybridisation
(iv) $Se{F}_4\&C{H}_4$