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Which of the following pairs are expected to have an unexpectedly low boiling temperature?
Which are expected to have an unexpectedly high or low boiling temperature?
- n-butane / 2-methylpentane
- acetone / dimethylamine
- water / n-butane
- acetonitrile / benzene
Solution
1) n-butane+ 2-methylpentane.. not attracted (nopolairty in any compound) (no.of carbon
=8)
2) acetone+ dimethylamine .. attracted due to H-bonding and dipole diff. (no. of carbons
=5)
3) water + n-butane .. only H-bionding (no.of carbon 3)
4) acetonitrile +benzene .. only ionic diff. (no. of carbon 6)
so boiling point= 3<2<4<1
Which of the following pairs are expected to have an unexpectedly low.docx

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Which of the following pairs are expected to have an unexpectedly low.docx

  • 1. Which of the following pairs are expected to have an unexpectedly low boiling temperature? Which are expected to have an unexpectedly high or low boiling temperature? - n-butane / 2-methylpentane - acetone / dimethylamine - water / n-butane - acetonitrile / benzene Solution 1) n-butane+ 2-methylpentane.. not attracted (nopolairty in any compound) (no.of carbon =8) 2) acetone+ dimethylamine .. attracted due to H-bonding and dipole diff. (no. of carbons =5) 3) water + n-butane .. only H-bionding (no.of carbon 3) 4) acetonitrile +benzene .. only ionic diff. (no. of carbon 6) so boiling point= 3<2<4<1