Which functional group from the following is considered as the principal functional group if a polyfunctional compound is to be named by the $IUPAC$ system?

  • A
    $-CN$
  • B
    $-OH$
  • C
    $-C \equiv C-$
  • D
    $-COOH$

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Give the different structures and names of the following alkyl groups:
$(a)$ Propyl group
$(b)$ Butyl group
$(c)$ Pentyl group

The $IUPAC$ name of the structure $HOOC-CH(NH_2)-CH(CHO)-COOH$ is:

Identify the functional groups in the following compounds. Write their name,suffix,and prefix.
$(a)$ $CH_3CH_2CH_2COOH$
$(b)$ $CH_3CH_2CH_2COO^{-}Na^{+}$
$(c)$ $CH_3CH_2COOCH_3$

The $IUPAC$ name of the following compound is:

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The correct $IUPAC$ name of the given compound is:

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