What Is the Correct Assignment of the Number of Signals

question 12

Multiple Choice

What is the correct assignment of the number of signals in the ¹³C NMR spectra of the following disubstituted benzene derivatives?

• A)I = 3 signals; II = 3 signals; III = 2 signals.
• B)I = 3 signals; II = 4 signals; III = 2 signals.
• C)I = 6 signals; II = 6 signals; III = 6 signals.
• D)I = 3 signals; II = 4 signals; III = 3 signals.

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Definitions:

Unless

Unless is a conjunction used to introduce a conditional clause, specifying an exception or a circumstance under which a statement does not apply.

Valid Inference

A logical conclusion drawn from premises that are accepted as true, ensuring the conclusion necessarily follows from them.

Copernicus

A Renaissance mathematician and astronomer who formulated a model of the universe that placed the Sun rather than the Earth at its center.