Question
Find the correct statements related to group 15 hydrides.
A. Reducing nature increases from ${NH}_{3}$ to ${BiH}_{3}$
B. Tendency to donate lone pair of electrons decreases from ${NH}_{3}$ to ${BiH}_{3}$
C. The stability of hydrides decreases from ${NH}_{3}$ to ${BiH}_{3}$
D. HEH bond angle decreases from ${NH}_{3}$ to ${SbH}_{3}$ ( $E =$ Elements of group 15)
Choose the correct answer from the options given below :
Options
Solution
Sol. [Key Concept: For group-15 hydrides all four statements hold: reducing nature increases ${NH}_{3} \rightarrow \ {BiH}_{3}$, lone-pair donation decreases, stability decreases and the H-E-H bond angle decreases, so A, B, C and D are correct.]
(1) Reducing nature : ${NH}_{3} < {PH}_{3} < {AsH}_{3} < {SbH}_{3} < {BiH}_{3}$
(2) Lone pair definition tendency : ${NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3} > {BiH}_{3}$
(3) Stability of Hydrides: ${NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3} > {BiH}_{3}$
(4) HEH bond angle: ${NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3} > {BiH}_{3}$
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