Question

which of the following generally produce signals between 100 - 150 ppm in 13c nmr spectroscopy? select answer from the options below sp-hybridized carbon atoms as well as sp3-hybridized carbon atoms that are deshielded by electronegative atoms sp2-hybridized carbon atoms carbon atoms of carbonyl groups sp3-hybridized carbon atoms (methyl, methylene, and methine groups)

Answer 1

Signals between 100 - 150 ppm in 13C NMR spectroscopy are generally produced by sp2-hybridized carbon atoms, often associated with double bonds and resonance structures as seen in benzene.

Step-by-step explanation:

In 13C NMR spectroscopy, signals between 100 - 150 ppm generally arise from sp2-hybridized carbon atoms. These carbons are found in compounds with double bonds or resonance structures, such as those in benzene rings where the electrons are delocalized. An example includes molecules like formaldehyde (CH2O) and ethene (H2C=CH2), which have sp2 hybridization due to the presence of a double bond and two single bonds connected to the central carbon atom, or lone pairs as seen in certain heterocyclic compounds.