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Unlike many other gemstone varieties, natural and synthetic corundums

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Unlike many other gemstone varieties, natural and synthetic corundums  [#permalink]

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New post 14 Nov 2018, 15:41
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A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

24% (01:08) correct 76% (01:14) wrong based on 223 sessions

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Unlike many other gemstone varieties, natural and synthetic corundums are incredibly easy to discriminate between.


A Unlike many other gemstone varieties, natural and synthetic corundums are incredibly easy to discriminate between.

B Unlike many other gemstone varieties, the origin of corundums is incredibly easy to identify.

C Unlike those in many other gemstone varieties, natural and synthetic corundums are incredibly easy to identify.

D It is incredibly easy, unlike in many other gemstone varieties, to discriminate between natural and synthetic corundums.

E Corundums are unlike many other gemstone varieties in that it is incredibly easy to discriminate between natural and synthetic ones.

Source: PrepScholar

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Re: Unlike many other gemstone varieties, natural and synthetic corundums  [#permalink]

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New post 14 Nov 2018, 19:12
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Sentence structure is somewhat awkward
Only E clarifies right comparison and intent of sentence
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Unlike many other gemstone varieties, natural and synthetic corundums  [#permalink]

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New post 14 Nov 2018, 20:07
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wunstepcloser wrote:
Unlike many other gemstone varieties, natural and synthetic corundums are incredibly easy to discriminate between.


A Unlike many other gemstone varieties, natural and synthetic corundums are incredibly easy to discriminate between.

B Unlike many other gemstone varieties, the origin of corundums is incredibly easy to identify.

C Unlike those in many other gemstone varieties, natural and synthetic corundums are incredibly easy to identify.

D It is incredibly easy, unlike ____?? in many other gemstone varieties, to discriminate between natural and synthetic corundums.

E Corundums are unlike many other gemstone varieties in that it is incredibly easy to discriminate between natural and synthetic ones.

Source: PrepScholar

Idiom: Unlike X, Y

Meaning: Gemstones can be both natural and synthetic. In many gemstone varieties, it is hard to tell the difference between
natural and synthetic stones. By contrast, it is easy to tell the difference between natural and synthetic corundums (a kind of gemstone).

Split #1: Items being compared must be parallel

Option B compares [gemstone] varieties to [a gemstone's] origin
B compares a noun to a noun, but they do not have the same kind of content.
One means "different kinds" and the other refers to whether the gemstones are "manufactured or mined."

Option C compares those [what? something present IN other gemstones] to corundums
C compares a pronoun (without an antecedent) to a noun

Option D, if it can be described as a comparison, compares a mysterious and unstated something IN to the verb "to discriminate"
D compares a preposition to an infinitive (and the infinitive should be a participle)

Eliminate B, C, and D

Split #2: Certain prepositions should almost never be placed at the end of sentences. High on the list is "between."

According to urban legend (the quotation is attributed incorrectly), Winston Churchill once said:
Ending a sentence with a preposition is something up with which I will not put!

The GMAT does not forbid sentences that end in prepositions. Even so, "between" is jarring.

Option A says . . . .natural and synthetic corundums are incredibly easy to discriminate between.
Option A SHOULD say: natural and synthetic corundums are incredibly easy to tell apart.

Arguably option A also violates parallelism.
We could assert that A compares varieties to natural and synthetic,
that is, incorrectly compares a noun to adjectives.
Tough call. Every once in a while the GMAT allows the comparison to stand if Y is a noun preceded by adjectives.

Deciding between A and E, however, is not hard.
Option E is clear and captures the meaning described above.

ANSWER E

Takeaway: in that it is may seem "wordy," but
(1) the phrase is idiomatic (2) it is often used in sophisticated writing, and
(3) it is part of the only answer that makes sense.


P.S. a bit delayed because I haven't seen your posts before, but:
wunstepcloser , welcome to GMAT Club! :)
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Re: Unlike many other gemstone varieties, natural and synthetic corundums  [#permalink]

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New post 20 Dec 2018, 05:56
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Hi

Had it been

Corundums are unlike many other gemstone varieties in that it is incredibly easy to discriminate between natural and synthetic one(s) without 's' then the pronoun reference error would arrise
Please correct me if I am wrong.

Thanks

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Re: Unlike many other gemstone varieties, natural and synthetic corundums &nbs [#permalink] 20 Dec 2018, 05:56
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Unlike many other gemstone varieties, natural and synthetic corundums

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