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Chemistry · Oct / Nov 2023 · Paper 12 · Question 7

5070Relative masses of atoms and molecules

Which row shows a pair of molecules where the $M_r$ of compound X is exactly half that of compound Y? [$A_r$: C, 12; Cl, 35.5; H, 1; O, 16]

  1. AX: CH3CH2CH3, Y: CO2
  2. BX: CH3CH2Cl, Y: CH2ClCH2Cl
  3. CX: CH3CO2H, Y: CH3CH2CH3
  4. DX: CO2, Y: CH3CO2C2H5

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Correct answer: D. X: CO2, Y: CH3CO2C2H5

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