MolSynapsequestion bank

MolSynapse / Question bank / General Organic Chemistry I: Electronic Effects / Resonance: rules, conditions and drawing resonating structures

NEET levelSingle correct optionDifficulty 1 of 3g1031

In benzene, which statement about the carbon-carbon bonds is correct?

AAll six C-C bonds are pure double bonds.
BAll six C-C bonds are equal in length, intermediate between single and double bonds.
CAll six C-C bonds are pure single bonds.
DThree C-C bonds are single and three are double, with different lengths.

Answer: B

Benzene is a resonance hybrid of the two Kekule structures, and the pi electrons are delocalised over the ring. So all C-C bonds have the same length (about 139 pm), between a single (154 pm) and a double (134 pm) bond.

Practice General Organic Chemistry I: Electronic Effects More on Resonance: rules, conditions and drawing resonating structures

Previous questionNext question

More questions on Resonance: rules, conditions and drawing resonating structures

Which of the following groups shows a +M (+R) effect? NEET level
Which of the following is a -M group? NEET level
Which of the following species is stabilised by resonance? NEET level
Which of the following carbocations is the most stable? NEET level
Count all the contributing resonance structures of the carbonate ion CO3^2- that obey the standard rules (same sigma framework, octet rule o... JEE Main level
In which of the following ions or molecules are all the C-O bonds of equal length? JEE Main level