Match List - I with List- II. Choose the correct answer from the options given below:
List - I (Hydrides) List - II (Nature) (a) MgH2 (i) Electron precise (b) GrH4 (ii) Electron deficient (c) B2H6 (iii) Electron rich (d) HF (iv) Ionic
Match List - I with List- II. Choose the correct answer from the options given below:
| List - I (Hydrides) | List - II (Nature) | ||
| (a) | MgH2 | (i) | Electron precise |
| (b) | GrH4 | (ii) | Electron deficient |
| (c) | B2H6 | (iii) | Electron rich |
| (d) | HF | (iv) | Ionic |
- (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
- (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
- (a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
- (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
The Correct Option is A
Solution and Explanation
To solve this matching problem, we need to correctly pair each hydride from List - I with its nature from List - II:
- (a) MgH2 - This is an ionic hydride. It consists of metallic magnesium and hydrogen, forming an ionic bond, thus matching option (iv) Ionic.
- (b) GrH4 - This appears to be a typographical error. Assuming it refers to methane (CH4), it would be electron precise as it has an exact number of electrons to satisfy the octet rule of carbon, matching option (i) Electron precise.
- (c) B2H6 - Diborane is considered an electron-deficient compound because it has fewer electrons than required for conventional 2-center 2-electron bonds, matching option (ii) Electron deficient.
- (d) HF - Hydrogen fluoride is electron rich because it consists of a highly electronegative fluorine atom with lone pairs, matching option (iii) Electron rich.
Based on these pairings, the correct match is:
- (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii), which aligns with the provided correct answer.
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Concepts Used:
Chemical Bonding and Molecular Structure
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
Types of Chemical Bonds:
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.
- Ionic Bonds - Ionic bonding is a type of chemical bonding which involves a transfer of electrons from one atom or molecule to another.
- Covalent Bonds - Compounds that contain carbon commonly exhibit this type of chemical bonding.
- Hydrogen Bonds - It is a type of polar covalent bonding between oxygen and hydrogen wherein the hydrogen develops a partial positive charge
- Polar Bonds - In Polar Covalent chemical bonding, electrons are shared unequally since the more electronegative atom pulls the electron pair closer to itself and away from the less electronegative atom.
Factors Affecting Bond Enthalpy in Chemical Bonding:
- Size of the Atom
- Multiplicity of Bonds
- Number of Lone Pair of Electrons Present
- Bond Angle