Question textAre each of the following line structures valid representations for the arene benzene?(A)? Answer 1 Question 1[select: , Y, N] (B)? Answer 2 Question 1[select: , Y, N] (C)? Answer 3 Question 1[select: , Y, N](D)? Answer 4 Question 1[select: , Y, N] (E)? Answer 5 Question 1[select: , Y, N] (F)? Answer 6 Question 1[select: , Y, N]

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The question asks which of the listed line structures are valid representations for the arene benzene. Below, I examine each option in turn, noting typical conventions used to depict benzene and common pitfalls.

(A) This structure appears to be a six-membered ring with all single bonds and no circle or alternating pattern indicated. A pure cyclohexane-like ring (no aromatic characteristics) is not benzene, which is an aromatic ring with delocalized electrons. Therefore, this representation is not a valid depiction of benzene, because it fails to convey aromaticity and the characteristic delocalized electron system.

(B) This option shows a six-membered ring with an explicit aromatic depiction (such as alternating double bonds or equivalent resonance notation). This aligns with standard representations of benzene as an aromatic ring with a conjugated pi system. This is a valid benzene representation because it communicates aromaticity and the correct ring size.

(C) The third option seems to display a six-membered ring but with substituents or bond patterns that disrupt the standard aromaticity convention, or it may illustrate a non-aromatic or incorrectly drawn system. If the drawing breaks the delocalized six-electron cycle or includes inappropriate substituent placements that break the aromatic sextet, it would not be a correct benzene representation. This is likely invalid as a benzene depiction.

(D) This option shows a simple hexagonal ring with a circle inside (the classic “circle in a hexagon” representation). This is a widely accepted shorthand for benzene, indicating the aromatic delocalization. It is a valid representation of benzene.

(E) This depiction seems to present a hexagonal ring with hydrogens shown around the perimeter and no clear indication of aromatic delocalization (for example, a standard benzene ring would be drawn with a circle or alternating bonds). If the image represents a benzene ring without reflecting aromaticity (no circle or alternating bonds), it would be considered incomplete or nonstandard for benzene. Therefore, this is likely not a valid benzene representation.

(F) The final option shows a hexagonal ring that resembles benzene; if the ring is drawn with a single bond pattern that does not convey aromatic delocalization (such as all single bonds without the circle or alternating bond notation), some instructors may still accept it as a partial or less explicit representation. However, without an aromatic notation (circle or alternating double bonds), this depiction may be considered incomplete or nonstandard. Thus, this is likely not the preferred valid representation.

In summary, standard valid representations of benzene typically include: (i) alternating double bonds in a hexagonal ring, (ii) a hexagon with a circle inside. Using those criteria, options that align with these conventions are valid, while those that do not show aromatic delocalization are not. Remember that different textbooks may accept the circle-in-hexagon as a valid shorthand and may require explicit aromatic notation or aromatic ring symbolism in drawings.

My LMS Subjects Practice LMS questions, Week 3

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