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# The correct order of bond length among the following is:A. $C = O > C = C > C = N$B. $C = O > C = N > C = C$C. $C = C > C = N > C = O$D. $C = N > C = C > C = O$

Last updated date: 20th Jun 2024
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Hint: Bond length is defined as the average distance between the center of the nucleus to two covalently bonded atoms in a molecule and bond strength is measured by bond length, the greater the bond length weaker will be the bond strength.

In the above case, the order of bond length depends upon the size of oxygen, carbon, and nitrogen. Since oxygen, carbon, and nitrogen all belong to the same period i.e. period 2nd. Moving left to right or on moving in a period size of the atom decreases as there is an increase in effective nuclear charge. The size of oxygen-carbon and nitrogen decreases in the order given as:
Carbon > nitrogen > oxygen .
Hence the correct order of bond length among the given cases is :
$C = C > C = N > C = O$

So, the correct answer is Option C.

Note: The bond length is expressed in terms of Angstrom (${A^ \circ }$) which is equal to ${10^{ - 10}}$ m or picometer which is equal to ${10^{ - 12}}$ m. Bond length is experimentally measured by either X-ray diffraction method or electron diffraction method. We can also determine it with the spectroscopic method.