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Subject - Chemistry:

Basics

MCQ - 95-2281

Question:

Which of the following isomers is likely to have the highest boiling point?

  1. (CH3)3CCH2CH3
  2. (CH3)2CHCH(CH3)2
  3. (CH3)2CHCH2CH2CH3
  4. (CH3)2CHCH(CH3)2

Correct Answer: C

Explanation:

All the 5 compounds are isomers of hexane but D is un-branched. It has the greatest surface area of contact for VDW interaction and hence the highest boiling point.
The enthalpy changes for two reactions are given by the equations below
2Fe(s) + 1½ O2(g) → Fe2O3(s) ΔHᴓ= -822 kJ mol-1
C(s) + ½ O2 (g) → CO(g) ΔHᴓ= -110 KJ MOL-1

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