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Give the decreasing order of C-H bond le...

Give the decreasing order of `C-H` bond length in ethane, ethene and ethyne and why?

Text Solution

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The decreasing `C-H` bond length is :
Ethane`(C_(2)H_(6))gt` Ethene `(C_(2)H_(4))gt` Ethyne `(C_(2)H_(2))`.
This is because the bybrid orbitals of C-atom involved in ovelapping with 1s orbital of H-atom are `sp^(3),sp^(2) and sp` respectively and their sizes are in the order. `sp^(3)gtsp^(2)gtsp`.
Alternatively: The `(C-C)` bond length gt `(C=C)` bond length `(C-=C)`bond length.
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Knowledge Check

  • The decreasing order of C-X bond length in CH_3-X is

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    B
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    C
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  • The decreasing order of bond angle is

    A
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    B
    `NO_2^(-)gtNO_2 gt NO_2^(+)`
    C
    `NO_2^(+)gt NO_2 gt NO_2^(-)`
    D
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    B
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    C
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    D
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