How many signals would you expect to see in the 1H NMR spectrum of CH3CH2CH3?

Question

BlackTom AI · Accepted Answer

The question asks how many distinct proton environments (signals) appear in the 1H NMR spectrum of CH3CH2CH3 (propane).

Option a. 2: This is correct. In propane there are two types of protons that are chemically non-equivalent:
- The two terminal methyl groups (each CH3) are chemically equivalent due to the molecule's symmetry, so they contribute to a single signal that represents 6 hydrogens total.
- The middle methylene group (CH2) is in a different environment from the methyl groups, giving a second signal that represents 2 hydrogens.
Thus, there are two distinct proton environments, hence two signals in the spectrum.

Option b. 3: This would require three distinct proton environments. In propane, the two CH3 groups are equivalent, so they do not create a separate signal each. Therefore this option overcounts the number of environments.

Option c. 1: This would imply all protons are in the same chemical environment, which is false here because CH2 is different from CH3, giving at least two environments.

Option d. 4: This would imply four different environments. Propane does not have that many distinct proton environments; the symmetry collapses the two terminal CH3 groups into one environment.

In summary, only two distinct proton environments exist in CH3CH2CH3, corresponding to two observable signals in the 1H NMR spectrum.

How many signals would you expect to see in the 1H NMR spectrum of CH3CH2CH3?

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