1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following statements. I. In the CH 4 molecule there are eight valence electrons available for bonding. II. Sigma molecular orbitals are symmetrical around the bond axes. III. The formation of positive and negative ions involve electron gain enthalpy. IV. Hydrogen bonding is the characteristic features of all polar molecules. Choose the correct statements.

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Q. Consider the following statements.
I. In the $CH _{4}$ molecule there are eight valence electrons available for bonding.
II. Sigma molecular orbitals are symmetrical around the bond axes.
III. The formation of positive and negative ions involve electron gain enthalpy.
IV. Hydrogen bonding is the characteristic features of all polar molecules.
Choose the correct statements.

Chemical Bonding and Molecular Structure

Solution:

Statements I, II are correct whereas statements III and IV are incorrect. Corrected form are as follows :
III. The formation of positive ions involve ionisation enthalpy and negative ions involve electron gain enthalpy.
IV. Hydrogen bonding is the characteristic feature of those polar molecules which contain a covalent bond between $H$ and any electronegative atoms among $F , O , N$.