In but-1, 3-diene the `C_(2)-C_(3)` bond length is
In but-1, 3-diene the `C_(2)-C_(3)` bond length is
A. 135 pm
B. 120 pm
C. 146 pm
D. 154 pm.
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Correct Answer - C
`CH_(2)=CH-CH=overset(+)CH_(2)harroverset(+)CH_(2)-CH=CH-overset(-)CH_(2)rarroverset(-)CH_(2)-CH=CH-overset(+)CH_(2)`
Due to resonance, the `C_(2)-C_(3)` bond has a bond length between C-C (single) bond and C=C (double) bond i.e., 146 pm.
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