General Organic Chemistry & Isomerism · JEE Main previous year questions

2025 26 questions

1. Q752025 · 22 Jan 2025 · Shift 1· Numerical answer

   $\mathrm{A}\to \mathrm{B}$ The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of $1000\text{ K}$ . If the energy barrier with respect to reactant energy for such isomeric transformation is $191.48{\text{ kJ mol}}^{-1}$ and the frequency factor is $10^{20}$, the time required for $50\%$ molecules of A to become B is _________ picoseconds (nearest integer). $\left[\mathrm{R}=8.314{\text{ J K}}^{-1}{\text{ mol}}^{-1}\right]$

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   Answer: 69