For the following structures, place the appropriate letter next to each C = O gr

Question

For the following structures, place the appropriate letter next to each C = O group next to the IR value corresponding to its approximate frequency in its IR spectrum. You may use an absorption value than once, or not at all. I = 1740 cm^-1 ___ II = 1710 cm^-1 ___ III = 1680 cm^-1 ___ IV = 1665 cm^-1 ____ Answer the following questions, using the structures, a to j. You may need to use a structure more than one or not at all. More than one structure may be an answer to a question; give both letters. if a question does an answer from a thru j, indicate NA.

Explanation / Answer

1740cm-1 - D , C.

aromatic esters, aromatic group withdraw electrons from carbonyl inaddition to OR group.so it has more double bond character which increases the strength of the bond. while aliphatic esters one of the groups are electron releasing so it will be less compared to aromatic ester

1710 cm-1- A, F aliphatic ester and aliphatic ketone

1680cm-1-E ketone.

1665cm-1- amide it has less double bond nature due to ease of delocalisation

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