Question:
The covalent hydrides of elements X and Y act as Lewis acid and Lewis base respectively. Covalent hydride of element Z is neither Lewis acid nor Lewis base. What are X, Y and Z respectively?
The covalent hydrides of elements X and Y act as Lewis acid and Lewis base respectively. Covalent hydride of element Z is neither Lewis acid nor Lewis base. What are X, Y and Z respectively?
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Lewis acids are electron-deficient (e.g., $B$, $Al$); Lewis bases have lone pairs (e.g., $N$, $P$).
Updated On: Jun 6, 2026
- B, C, N
- B, S, La
- Be, F, C
- Al, P, Si
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The Correct Option is D
Solution and Explanation
Step 1: Concept
Lewis acid/base definition: Acid = electron pair acceptor; Base = electron pair donor.
Step 2: Meaning
Hydrides: $AlH_3$ (electron deficient, Lewis acid), $PH_3$ (lone pair, Lewis base), $SiH_4$ (octet complete, neither).
Step 3: Analysis
X ($AlH_3$) is an acid. Y ($PH_3$) is a base. Z ($SiH_4$) is neither.
Step 4: Conclusion
The correct elements are Al, P, and Si.
Final Answer: (D)
Lewis acid/base definition: Acid = electron pair acceptor; Base = electron pair donor.
Step 2: Meaning
Hydrides: $AlH_3$ (electron deficient, Lewis acid), $PH_3$ (lone pair, Lewis base), $SiH_4$ (octet complete, neither).
Step 3: Analysis
X ($AlH_3$) is an acid. Y ($PH_3$) is a base. Z ($SiH_4$) is neither.
Step 4: Conclusion
The correct elements are Al, P, and Si.
Final Answer: (D)
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