Q.2 Describe how IR carbonyl and specific other absorbances can distinguish propiophenone from 1-phenyl-2-propanone and p-ethylbenzaldehyde.
Q.2 Describe how IR carbonyl and specific other absorbances can distinguish propiophenone from 1-phenyl-2-propanone and p-ethylbenzaldehyde.
Homework Answers
propiophenone is a conjugate carbonyl group with bezene ring hence ddue to conjugation C=O stretching frequency lowers down to 1690 cm-1 typical of conjugated ketone
whereas in 1-phenyl-2-propanone it is non-conjugate aliphatic ketone with phenyl as substituents hence its C=O stretching frequency will appearat normal 1710 cm-1
In case of ethylbenzaldehyde we have an aldehyde group C=O stretching frequency will appear at 1720 cm-1
hence these three can be easily distinguished by IR from their C=O stretching frequency
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Q.2 Describe how IR carbonyl and specific other absorbances can distinguish propiophenone from 1-phenyl-2-propanone and p-ethylbenzaldehyde.
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