NEETChemistryChemical Bonding and Molecular Structure
Given below are two statements: Statement I: According to Molecular Orbital Theory, the diatomic carbon molecule ( C₂ ) contains two bonds and no bond. Statement II: In a molecule of ethyne, the carbon-carbon triple bond consists of one and two bonds. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Statement I and Statement II are incorrect
- BBoth Statement I and Statement II are correct
- CStatement I is correct but Statement II is incorrect
- DStatement I is incorrect but Statement II is correct
Correct answer
B. Both Statement I and Statement II are correct
Step-by-step solution
Statement I is correct. The electronic configuration of C₂ (12 electrons) according to Molecular Orbital Theory is 1s^2 ^ * 1s^2 2s^2 ^ * 2s^2 2p_x^2 = 2p_y^2 . The highest occupied molecular orbitals are orbitals with 4 electrons. The bond order is 8-4 2 = 2 . Since the last four electrons enter the bonding molecular orbitals, the double bond in C₂ consists of two bonds and no bond. Statement II is correct. Ethyne ( HC CH ) contains a carbon-carbon triple bond, which is universally formed by one bond (head-on over