Question

Given the stretching frequencies for the C?H bonds shown in green, arrange the corresponding bonds in...

Given the stretching frequencies for the C?H bonds

Given the stretching frequencies for the C?H bonds shown in green, arrange the corresponding bonds in order of increasing strength.

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Concepts and Reason

This problem is based on the concept of bond stretching frequency.

Interatomic bonds vibrate at certain frequencies with certain mode of vibrations such as stretching, bending etc. this frequency is known as bond stretching frequency. It is used in IR spectroscopy in order to determine the functional groups present in the compound.

Fundamentals

Bonds which are strong usually show high stretching frequency as their stretch limitation is much more than the weaker bonds.

The structures of compounds are as follow:

3080 cm
R-CH=CH
H
B.
R-CH,
2850 cm
C.
R-
C=
C—H 3300 cm-

The reason of the increasing order being B < A < C is that stronger bonds can stretch more as compared to the weaker bonds. Thus, their stretching frequencies are high.

Ans:

The increasing order of bond strength is B < A < C.

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