Why Is Supernova 1987A Particularly Important to Astronomers

question 70

Multiple Choice

Why is Supernova 1987A particularly important to astronomers?

• A)It is the nearest supernova to have occurred at a time when we were capable of studying it carefully with telescopes.
• B)It was the first supernova detected in nearly 400 years.
• C)It provided the first evidence that supernovae really occur.
• D)It occurred only a few light-years from Earth.

Understand the concept and application of nucleophilic aromatic substitution reactions.

Explain the directing effects of functional groups in electrophilic aromatic substitution reactions.

Distinguish between activating and deactivating groups and their effects on reaction rate and product formation in aromatic substitution reactions.

Predict and rationalize the outcomes of reactions involving the nitration of aromatic compounds.

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