Question

Describe the significant IR signals that are present or absent and determine what chemical it could be representative of.

102 100 V 55 45 cm-1 2000 2500 1500 1000 650 4000 3500 3000 20505050505050508 10 88776655443322 55-50 5 433

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Answer #1

There is a strong peak around 1700 cm-1

it is well known that any compound having a carbonyl bond (C=O) shows strong IR peak in between 1670-1820 cm-1

So, this compound must has an carbonyl group ( may be acid or ester or ketone or aldehyde)

there are more than two peaks in between 1000 to 1300 cm-1

which are mainly due to C-O stretch. hence, the compound has both carbonyl group and C-O group, therefore, the compound must be an ester compound.

there is no peak of medium intensity between 1400 -1600 cm-1 , which concludes that the compound does not have any aromatic C=C bond. similarly there is no variable peak in between 1400 - 1680 cm-1 or in between 2100-2380 cm-1. So, it has no C=C or alkyne bond. It is an alkane having ester group. The peak at 3000 cm-1 due to the C-H stretch.

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