GATE CY 2026 Question Paper (07-Feb-2026) (Shift 2)

According to molecular orbital theory, the correct ground state electronic configuration for $[Co(N{H}_3{)}_6{]}^{3+}$ ion is

The species which follows 18-electron rule is
(en = ethylenediamine)

The point group of $C{H}_2=C=C{H}_2$ is

Among the following, the one for which the infrared active vibrational modes are Raman inactive and vice versa is

For the following reaction,
A + B $\rightleftharpoons$ X${}^{‡}\to$ product
If the value of ${\Delta }^{‡}{U}^o=\frac{5}{2}RT$, then the value of ${\Delta }^{‡}{H}^o$ is
(X${}^{‡}$ is an activated complex; ${\Delta }^{‡}{U}^o$ is standard change in internal energy; ${\Delta }^{‡}{H}^o$ is standard enthalpy of activation; $R$ is gas constant; $T$ is temperature)