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Cyclic Compounds

nbsp;benzene ...

Question

benzene ring has alternate single and double bonds, yet all the C-C bond lengths are the same.
why?

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Solution

In a benzene molecule six pi electrons are not confined on any specific carbon atom, but are delocalized over whole ring and provide stability to molecule. Due to this delocalization of pi bonds bond length of carbon atoms in benzene are intermediate to carbon-carbon single bond and carbon-carbon double bond.

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Q. Cyclobutadiene (below) is like benzene in that it has alternating single and double bonds in a ring. However, its bonds are not same length, double bonds being shorter than the single bonds; the molecule is rectangular, not square. Explain why it would be incorrect to write resonance structures as shown.

Q. (A) : The C, C bond length in benzene is intermediate between C, C single bond length and C, C double bond length.
(R) : Benzene molecule exhibits resonance.

Q. The C-C bond length is

1.54 \circ A

. C=C bond length is

1.33 \circ A

. What is the circumference of the benzene ring? Bond length between single and double bond =

1.4 \circ A

.

'C-C' bond length in benzene lies between single and double bond. The reason is

Benzene with molecular formula, C₆H₆, has

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