compare the strength of C-H bond and their C=O Bond if the absorption frequencies are 3000cm^-1 and 1700 cm^-1 respectively
Answers
Answer:
In increasing order of the stretching frequency the carbon bonds are given C ≡ C> C = C > C — C. Explanation: the stretching frequency increases with increase in the number of Pi bond which is present in the carbon bond
Answer:
Vibrational frequencies are partly dependent on the reduced mass of the system, not just the strength of the bond. Increasing the masses of the atoms involved reduces the frequency; increasing the strength of the bond increases the frequency.
Thus, C-O single bonds vibrate around 1000 , while C=O double bonds vibrate around 1700 . That’s because the double bond is stronger (masses are the same).
But an H-O single bond vibrates around 3300 . That’s because hydrogen is 1/12 the mass of carbon; the single-bond strengths are about the same.
We also see this in comparing carbon-hydrogen bonds (2800–3300 ) with silicon-hydrogen bonds (ca. 2100 ). The effect is harder to untangle, because Si-H bonds are weaker than C-H bonds.
I’m neglecting the effect of bond length, by the way; the O-C vs. O-H difference is partly due to the O-H bond being shorter.
Explanation:
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Answer:
Vibrational frequencies are partly dependent on the reduced mass of the system, not just the strength of the bond. Increasing the masses of the atoms involved reduces the frequency; increasing the strength of the bond increases the frequency.
Thus, C-O single bonds vibrate around 1000 , while C=O double bonds vibrate around 1700 . That’s because the double bond is stronger (masses are the same).
But an H-O single bond vibrates around 3300 . That’s because hydrogen is 1/12 the mass of carbon; the single-bond strengths are about the same.
We also see this in comparing carbon-hydrogen bonds (2800–3300 ) with silicon-hydrogen bonds (ca. 2100 ). The effect is harder to untangle, because Si-H bonds are weaker than C-H bonds.
I’m neglecting the effect of bond length, by the way; the O-C vs. O-H difference is partly due to the O-H bond being shorter.
Explanation:
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