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NTA Abhyas NEET2020ChemistryChemical Bonding and Molecular StructurePractice

Arrange the melting points of following compounds in decreasing order 1 . n-butane 2 . cis-2-butene 3 . trans-2-butene 4 . 1-butyne

Options

  1. A1 > 2 > 3 > 4
  2. B4 > 2 > 3 > 1
  3. C4 > 3 > 2 > 1
  4. D3 > 2 > 1 > 4

Correct answer

C. 4 > 3 > 2 > 1

Step-by-step solution

Melting point ∝ molecular weight, symmetry of the molecule ∝ 1 μ of the compound. μ = dipole moment Hence the correct order of melting point is 1-butyne > trans-2-butene > cis-2-butene > n-butane.

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