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

For a reaction between neutral molecules X and Y in a solution at temperature $T$, the measured rate of reaction is equal to the rate of diffusion. Assume X is stationary and Y is moving. If the diameter of the molecule X is five times that of Y, then the rate constant for the reaction is
($\eta$ is viscosity of the solvent; $k$ is Boltzmann constant)

For the following electrochemical cells, liquid junction potentials affect the cell potential ($E_{cell}$).
I. Electrode-1 | 0.1 M KCl || 0.1 M NaCl | Electrode-2
II. Electrode-1 | 0.1 M HCl || 0.01 M HCl | Electrode-2
III. Electrode-1 | 0.01 M KCl || 0.01 M HCl | Electrode-2
The correct order of their $E_{cell}$ at 25 ${}^{\circ }$ C is

The set(s) of reagents that will effect the following conversion is(are)

The reaction(s) that produce(s) the following compound is(are)

The reaction(s) that produce(s) 2-methylindole as the major product is(are)