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what is the order of decreasing bond length for a C-C bond composed of the following...

what is the order of decreasing bond length for a C-C bond composed of the following molecular orbitals?

I. sp^3 - sp^3

II. sp^2 - sp^2

III. sp-sp

a) III>II>I

b)I>II>III

c) I>III>II

d) II>III>I

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