Question

The various types of hydrides and examples of each type are given below.

	Hydride type		Compound
(A)	Electron deficient	(i)	$LiH$
(B)	Saline	(ii)	$C{H}_4$
(C)	Electrons-precise	(iii)	$N{H}_3$
(D)	Interstitial	(iv)	$B_2{H}_6$
(E)	Electron rich	(v)	$CrH$

Choose the correct matching from the codes given below.

• A. $\left(A\right)-\left(ii\right),\left(B\right)-\left(iv\right),\left(C\right)-\left(v\right),\left(D\right)-\left(iii\right),\left(E\right)-\left(i\right)$
• B. $\left(A\right)-\left(iv\right),\left(B\right)-\left(i\right),\left(C\right)-\left(ii\right),\left(D\right)-\left(v\right),\left(E\right)-\left(iii\right)$
• C. $\left(A\right)-\left(iv\right),\left(B\right)-\left(iii\right),\left(C\right)-\left(v\right),\left(D\right)-\left(ii\right),\left(E\right)-\left(i\right)$
• D. $\left(A\right)-\left(v\right),\left(B\right)-\left(iii\right),\left(C\right)-\left(iv\right),\left(D\right)-\left(ii\right),\left(E\right)-\left(i\right)$
• E. $\left(A\right)-\left(iv\right),\left(B\right)-\left(v\right),\left(C\right)-\left(i\right),\left(D\right)-\left(ii\right),\left(E\right)-\left(iii\right)$

Answer 1

The correct option is B $\left(A\right)-\left(iv\right),\left(B\right)-\left(i\right),\left(C\right)-\left(ii\right),\left(D\right)-\left(v\right),\left(E\right)-\left(iii\right)$

(A) Electron deficient $\to B_2{H}_6$ ($\because$ It has $3c-2e$ structure, which shows that $B$-atom has electron deficient centre)
(B) Saline $\to LiH$ is called saline
(C) Electron precise $\to C{H}_4$ ($\because$ It has perfect complete octet $C$-atom).
(D) Interstitial $\to CrH$ Here, hydrogen atoms are trapped in the interstitial sites of crystal of $Cr$.
(E) Electron rich $\to \ddot{N}{H}_3$, because nitrogen has lone pair of electrons in its outermost shell.
Hence, correct order is $\left(A\right)-\left(iv\right),\left(B\right)-\left(i\right),\left(C\right)-\left(ii\right),\left(D\right)-\left(v\right),\left(E\right)-\left(iii\right)$