sblock Elements - Result Question 59
####10. The hydride that is not electron deficient is
(2019 Main, 11 Jan II)
(a) $AlH _3$
(b) $B _2 H _6$
(c) $SiH _4$
(d) $GaH _3$
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Answer:
Correct Answer: 10. (d)
Solution:
- $GaH _3, AlH _3$ and $B _2 H _6$ are the hydrides of group-13 $\left(n s^{2} n p^{1}\right)$, whereas $SiH _4$ is an hydride of group 14.
So, $B _2 H _6, AlH _3$ and $GaH _3$ are electron deficient hydrides. But, $SiH _4$ is an electron precise hydride of group-14 $\left(n s^{2} n p^{2}\right)$, i.e. these hydrides can have the required number of electrons to write their conventional Lewis structures.
