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Question

As per IUPAC rules, which of the following groups will be of highest priority?

A
CC
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B
OH
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C
COOR
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D
CHO
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Solution

The correct option is C COOR
The choice of principal functional group is made on the basis of order of preferences:
COOH>SO3H>COOR>COX>CONH2>CONR2>CN>NC>CHO>(>C=O)>OH>SH>NH2>NHR>NR2>(>C=C<)>(CC)
Hence, the correct answer is option (c).

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