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

- C \equiv C -

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- O H

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- C O O R

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- C H O

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Solution

The correct option is C $- C O O R$
The choice of principal functional group is made on the basis of order of preferences:
$- C O O H > - S O_{3} H > - C O O R > - C O X > - C O N H_{2} > - C O N R_{2} > - C N > - N C > - C H O > (> C = O) > - O H > - S H > - N H_{2} > - N H R > - N R_{2} > (> C = C <) > (- C \equiv C -)$
Hence, the correct answer is option (c).

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