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trans-pent -2-ene is polar but trans-bu...

trans-pent -2-ene is polar but trans-but -2-ene is non-polar- why ?

Text Solution

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In trans-but-2-ene molecule, the two `C-CH_3` bond moments oriented in opposite directions cancel each other and so the net dipole moment in trans-but-2-ene molecule is zero. On the other hand , in trans-pent-2-ene molecule, although the `C-CH_3 and C-C_2H_5` bond moments act in opposite directions ,they are not equal in magnitude and so they cannot cancel each other. Hence the molecule possesses a net dipole moment.
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  • 2-hexyne gives trans-2-hexene on treatment with

    A
    `Pt `/`H_2`
    B
    `Li`/`NH_3`
    C
    `Pd` / `BaSO_4`
    D
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