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While studying a salt of tartaric acid, an important

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New post 06 Mar 2006, 10:58
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A
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D
E

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While studying a salt of tartaric acid, an important constituent of wine, the occurrence of mirror-image molecules was first discovered by Louis Pasteur; these molecules are identical pairs of molecules except for rotating polarized light.

A)the occurrence of mirror-image molecules was first discovered by Louis Pasteur; these molecules are identical pairs of molecules except for rotating

B) the discovery was made by Louis Pasteur of the occurrence of mirror-image molecules, which are identical pairs of molecules except that they rotate

C) the fact that mirror-image molecules occur was discovered by Louis Pasteur; these molecules are identical pairs of molecules except their rotation of

D) Louis Pasteur discovered mirror-image molecules pairs of molecules identical except that they rotate

E) Louis Pasteur first discovered mirror-image molecules, which are identical pairs of molecules except for rotating.
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New post 06 Mar 2006, 21:03
Since Luis Pasteur was studying, only two choices D and E are possible. E clearly mentions that the two molecules differ in the way they rotate light.

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New post 08 Mar 2006, 11:30
OA is

^ E ^
  [#permalink] 08 Mar 2006, 11:30
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