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Question

(1) CN   , (2) CONH2   , (3) O||C, (4)CHO  
The decreasing order of priority for the given functional groups (for IUPAC nomenclature) is:


  1.  1 > 2 > 4 > 3

  2. 1 > 2 > 3 > 4

  3. 3 > 4 > 1 > 2

  4. 2 > 1 > 4 > 3


Solution

The correct option is D

2 > 1 > 4 > 3


Answer of the given functional group with decreasing preference is

(2) CONH2 > (1) CN > (4) CHO > (3) O||C

So answer is (a) is 2 > 1 > 4 > 3

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