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Which of the two : trans-but-2-ene-or tr...

Which of the two : trans-but-2-ene-or trans- pent-2- ene is non polar ?

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In trans-but-2-ene, the diple momens of the C-`CH_3` bonds are equal and opposite and hence they exactly cancel out each other. Thus, trans-but-2-ene is non-polar.

However, in trans-pent-2-ene, the +I-effect of `CH_3CH_2`-group is higher than of `CH_3` group, therefore, the dipole moment of `C-CH_3` and `C-CH_2CH_3` bonds are unequal . Although these two dipoles oppose each other , yet they do not exactly cancel out each other and hence trans-pent-2-ene has a small but finite dipole moment and thus is polar.
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