The heat of atomisation of methane and ethane are x kJ mol⁻¹ and… | JEE Main 2026 Chemistry PYQ

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

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

A
$\dfrac{hc}{1000}\left(\dfrac{y-6x}{4}\right)^{-1}$
B
$\dfrac{N_A hc}{250(y-6x)}$
C
$N_A hc\left(y-\dfrac{6x}{4}\right)^{-1}$
D
$\dfrac{N_A hc}{250(4y-6x)}$

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