Multiple Choice
An IR spectrum shows a strong, broad absorption around and a sharp absorption near . Which functional group is most likely present?
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2. Molecular Representations
Functional Groups
Multiple Choice
Which of the following structures represents a benzylic cation?
A
B
C
D
Verified step by step guidance1
Step 1: Understand the definition of a benzylic cation. A benzylic cation is a positively charged species where the positive charge is located on a carbon atom directly attached to a benzene ring (the benzylic position). This position is the carbon adjacent to the aromatic ring.
Step 2: Examine each structure to identify where the positive charge (cation) is located. Only structures with a positively charged carbon directly bonded to the benzene ring qualify as benzylic cations.
Step 3: For the given options, look for the structure that shows a benzene ring (C\_6H\_5) attached to a carbon with a positive charge (C\(\textsuperscript{+}\)H\_2). This indicates the benzylic position bearing the positive charge.
Step 4: Confirm that the other structures either have no positive charge or the positive charge is not on the benzylic carbon (for example, if the charge is on an oxygen or on a carbon not directly attached to the ring, it is not a benzylic cation).
Step 5: Conclude that the correct structure is the one with the benzene ring attached to a positively charged methylene group (C\(\textsuperscript{+}\)H\_2), representing the benzylic cation.
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