MCQMediumJEE Main 2026 · 24 January, Shift 2Enthalpies (Bond, Combustion, Formation…)

Chemistry Question from JEE Main 2026 · 24 January, Shift 2

The heat of atomisation of methane and ethane are x kJ mol−1x \, \text{kJ mol}^{-1} and y kJ mol−1y \, \text{kJ mol}^{-1} respectively. The longest wavelength (λ\lambda) of light capable of breaking the C–C bond can be expressed in SI unit as:

  • A

    hc1000(y−6x4)−1\dfrac{hc}{1000}\left(\dfrac{y-6x}{4}\right)^{-1}

  • B

    NAhc250(y−6x)\dfrac{N_A hc}{250(y-6x)}

  • C

    NAhc(y−6x4)−1N_A hc\left(y-\dfrac{6x}{4}\right)^{-1}

  • D

    NAhc250(4y−6x)\dfrac{N_A hc}{250(4y-6x)}

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