Question of 41
Q.(i) What are molecular hydrides ?
(1)
(ii) Classify the following molecular hydrides into electron deficient, electron precise and electron rich hydrides :
NH3, CH4, B2H6, HF (2)
NH3, CH4, B2H6, HF (2)
Kerala DhseKerala DHSE Plus One Board 2021Subjective· 3mImportance★★★★★
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Start your 14-day free trial to unlock the full solution →Molecular hydrides are covalent, discrete-molecule hydrides of p-block elements; they are classed as electron deficient, precise, or rich depending on whether the central atom has fewer, exactly enough, or extra (lone-pair) electrons compared with a full octet.
- Molecular hydrides Molecular hydrides are hydrides formed when p-block elements combine with hydrogen through covalent bonding. Unlike the ionic (saline) hydrides of s-block metals or the interstitial/metallic hydrides of d-block metals, molecular hydrides exist as discrete, well-defined covalent molecules — for example NH3, CH4, H2O and HF.
- Classification into electron deficient / precise / rich The classification depends on the number of electrons around the central atom compared with the octet:
- Electron deficient: the central atom has fewer than 8 electrons around it even after bonding (no lone pair, and not even enough bond pairs to reach 8). Example: B2H6 — boron has only 3 bond pairs (6 electrons) around it in the simple Lewis picture, which is why it forms bridge bonds to compensate. …
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