Home › Previous year questions › Physical Chemistry › Group Theory: Symmetry elements and symmetry operations. Basic postulates of groups and group multiplication tables. Classes, reducible and irreducible representations of symmetry elements. Classification and labelling of molecular point groups. Symmetry based selection rules and their application to electronic and vibrational spectroscopy. Internal coordinates and symmetry labelling of vibrational modes; symmetry adapted linear combination of atomic orbitals (LCAO-MO); construction of hybrid orbitals using molecular point group symmetry.

GATE Physical Chemistry: Group Theory: Symmetry elements and symmetry operations. Basic postulates of groups and group multiplication tables. Classes, reducible and irreducible representations of symmetry elements. Classification and labelling of molecular point groups. Symmetry based selection rules and their application to electronic and vibrational spectroscopy. Internal coordinates and symmetry labelling of vibrational modes; symmetry adapted linear combination of atomic orbitals (LCAO-MO); construction of hybrid orbitals using molecular point group symmetry. – Previous Year Questions

7 GATE previous year questions on Group Theory: Symmetry elements and symmetry operations. Basic postulates of groups and group multiplication tables. Classes, reducible and irreducible representations of symmetry elements. Classification and labelling of molecular point groups. Symmetry based selection rules and their application to electronic and vibrational spectroscopy. Internal coordinates and symmetry labelling of vibrational modes; symmetry adapted linear combination of atomic orbitals (LCAO-MO); construction of hybrid orbitals using molecular point group symmetry. (Physical Chemistry, Chemistry) with answers and explanations, from every paper.

GATE 2026 CY Q18 (1 mark, Multiple choice) – The point group of CH 2=C=CH 2 is
GATE 2026 CY Q19 (1 mark, Multiple choice) – Among the following, the one for which the infrared active vibrational modes are Raman inactive and vice versa is
GATE 2026 CY Q30 (1 mark, Numerical answer) – The order of the point group of [PdCl 6]2- is x and that of trans-[PdBr 2Cl 4]2- is y. The integer x − y is
GATE 2026 CY Q40 (2 marks, Multiple choice) – With metal M and monodentate ligands L numbered as shown, the sigma ligand-group orbital with the same symmetry as d z2 in octahedral geometry is
GATE 2025 CY Q18 (1 mark, Multiple choice) – The symmetry element that does NOT belong to C 4v point group is
GATE 2024 CY Q19 (1 mark, Multiple choice) – The order and the number of classes present in a group with the irreducible representations A 1,A 2,B 1,B 2,E 1, and E 2, are, respectively,
GATE 2024 CY Q57 (2 marks, Multiple select) – Among the following, the correct statement(s) is (are):