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NEST2020ChemistryChemical Bonding and Molecular Structure

Three types of potential energy due to attractive interaction between two species X and Y are represented by the curves I, II, and III in the figure below. Consider the dominating interaction between non-rotating species ( X Y ) for X = Na ⁺, ( CH ₃ )₂ CO , C ₆ H ₆, CH ₄ and Y = ( CH ₃ )₂ CO , Cl ⁻, C ₂ H ₆, CHCl ₃ . The correct assignment of the X Y interactions to the types I, II, and III is:

Options

  1. ANa ⁺ Cl ⁻= III ; ( C ₆ H ₆ ) ( CH ₃ )₂ CO = I ; ( CH ₄ ) ( C ₂ H ₆ )= II ; ( CH ₃ )₂ CO CHCl ₃= III .
  2. BNa ⁺ Cl ⁻= III ; ( C ₆ H ₆ ) ( CH ₃ )₂ CO = I ; ( CH ₄ ) ( C ₂ H ₆ )= I ; ( CH ₃ )₂ CO CHCl ₃= II .
  3. CNa ⁺ Cl ⁻= II ; ( C ₆ H ₆ ) ( CH ₃ )₂ CO = II ; ( CH ₄ ) ( C ₂ H ₆ )= III ; ( CH ₃ )₂ CO CHCl ₃= I .
  4. DNa ⁺ Cl ⁻= I ; ( C ₆ H ₆ ) ( CH ₃ )₂ CO = III ; ( CH ₄ ) ( C ₂ H ₆ )= II ; ( CH ₃ )₂ CO ₂ CHCl ₃= II .

Correct answer

B. Na ⁺ Cl ⁻= III ; ( C ₆ H ₆ ) ( CH ₃ )₂ CO = I ; ( CH ₄ ) ( C ₂ H ₆ )= I ; ( CH ₃ )₂ CO CHCl ₃= II .

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