(A) Electron deficient \\rightarrow { B }_{ 2 }{ H }_{ 6 } ( \\because It has 3c-2e structure, which shows that B -atom has electron deficient centre)(B) Saline \\rightarrow LiH is called saline(C) Electron precise \\rightarrow C{ H }_{ 4 } ( \\because It has perfect complete octet C -atom).(D) Interstitial \\rightarrow CrH Here, hydrogen atoms are trapped in the interstitial sites of crystal of Cr .(E) Electron rich \\rightarrow \\ddot { N } { H }_{ 3 } , because nitrogen has lone pair of electrons in its outermost shell.Hence, correct order is (A) - (iv), (B) - (i), (C) - (ii), (D) - (v), (E) - (iii)