Bond angle is minimum for
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The bond angle decreases as the electronegativity of the element M in \(H_2M\) decreases. It is minimum for \(H_2Te\). The bond angles of \(H_2O, H_2S, H_2Se, H_2Te\) are \(104.5^{\circ}, 92.5^{\circ},91^{\circ}, 90^{\circ}\) respectively.
- $H_2O$
- $H_2S$
- $H_2Se$
- $H_2Te$
The Correct Option is D
Solution and Explanation
Bond angle is minimum for H2Te.
The above-mentioned elements are the hydrides of the 6th group elements in which the central atom undergoes SP3 hybridization and should possess a bond angle of 109 degrees. However, the bond angle distorts as a result of the repulsion between the lone pair and the lone pair. But these repulsions are minimum in H2Te as the tellurium has a large size which makes the repulsions minimum.
Therefore, the correct answer is option D, the Bond angle of hydrides decreases down the group.
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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