Which of the following compounds has the maxi | vedclass

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(C) The bond length of a $C-C$ single bond depends on the hybridization of the carbon atoms involved. The bond length decreases as the $s$-character o

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$CH_3-CH=CH_2$

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(C) The bond length of a $C-C$ single bond depends on the hybridization of the carbon atoms involved. The bond length decreases as the $s$-character of the hybrid orbitals increases.
$sp^3-sp^3$ bond length $\approx 1.54 \ \mathring{A}$
$sp^3-sp^2$ bond length $\approx 1.50 \ \mathring{A}$
$sp^3-sp$ bond length $\approx 1.46 \ \mathring{A}$
$sp^2-sp^2$ bond length $\approx 1.48 \ \mathring{A}$
$sp^2-sp$ bond length $\approx 1.43 \ \mathring{A}$
$sp-sp$ bond length $\approx 1.37 \ \mathring{A}$
Analyzing the options:
$(a)$ $CH_2=CH-C \equiv CH$: $sp^2-sp$ bond.
$(b)$ $HC \equiv C-C \equiv CH$: $sp-sp$ bond.
$(c)$ $CH_3-CH=CH_2$: $sp^3-sp^2$ bond.
$(d)$ $CH_2=CH-CH=CH_2$: $sp^2-sp^2$ bond.
Comparing the $s$-character:
$(c)$ involves $sp^3-sp^2$ ($25$% $s$ and $33.3$% $s$),which has the lowest total $s$-character among the options,resulting in the longest bond length.

Which of the following compounds has the maximum $C-C$ single bond length?

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