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Asked by elizabeth lugones on May 07, 2024

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Which compound would be expected to show intense IR absorption at 2200 cm-1?

A) but-1-ene
B) PhCH2CN
C) CH3OCH2CH3
D) PhCH2NH2

IR Absorption

The process where a molecule absorbs infrared light, leading to an increase in vibrational energy levels, used in infrared spectroscopy to identify functional groups within a molecule.

But-1-ene

A simple alkene with a double bond between the first and second carbon atoms in its four-carbon chain.

PhCHCN

Stands for acetophenone's chemical formula, referring to a compound with a benzene ring attached to a methyl ketone.

  • Calculate IR absorption frequencies for different types of molecular attachments, including carbonyls, alkenes, and nitriles.
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ZK
Zybrea KnightMay 12, 2024
Final Answer :
B
Explanation :
The intense IR absorption at 2200 cm-1 corresponds to the stretching frequency of the triple bond in a nitrile group (C≡N). PhCH2CN (B) contains a nitrile group and is therefore expected to show this absorption. But-1-ene (A) contains a C=C double bond, which typically absorbs around 1650 cm-1, and does not contain a nitrile group. The compound in option C is a cyclic ether and option D is an amide, neither of which contain a nitrile group.

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