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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
MCQ
Which substance has the lowest boiling point?
  • A
    $ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OCH}_3 $
  • B
    $ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{CH}_3 $
    ​
  • ✓
    $ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3 $
    ​
  • D
    $ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C}=\mathrm{OCH}_3 $
✓

Answer

Correct option: C.
$ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3 $
​
$ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3  (n−$butane$)$ has the lowest boiling point as it has lowest molecular weight and is non polar. It has weakest intramolecular forces of attraction.
All others are polar compounds and so has dipole$-$dipole inbteraction.

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