JEE PYQ: P Block Elements Question 55
Question 55 - 2019 (10 Apr Shift 2)
The correct statements among (a) to (d) are:
(a) saline hydrides produce $\text{H}_2$ gas when reacted with $\text{H}_2\text{O}$. (b) reaction of $\text{LiAlH}_4$ with $\text{BF}_3$ leads to $\text{B}_2\text{H}_6$. (c) $\text{PH}_3$ and $\text{CH}_4$ are electron$-$rich and electron$-$precise hydrides, respectively. (d) HF and $\text{CH}_4$ are called as molecular hydrides.
(1) (a), (b), (c) and (d)
(2) (c) and (d) only
(3) (a), (c) and (d) only
(4) (a), (b) and (c) only
Show Answer
Answer: (4)
Solution
(a) Saline hydrides with water produces $\text{H}_2$ gas. (b) $3\text{LiAlH}_4 + 4\text{BF}_3 \to 2\text{B}_2\text{H}_6 + 3\text{LiF} + 3\text{AlF}_3$. (c) $\text{PH}_3$ is electron rich whereas $\text{CH}_4$ is electron precise hydride. (d) HF and $\text{CH}_4$ are molecular hydrides.
BETA
