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There are many functional groups which always occur in the terminal position of a carbon chain such as:

aldehydic group  -CHO
acyl chloride group -COCl
carboxylic acid group  -COOH
amide group  -CONH2
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Usually carboxylic acids  -COOH are given more preference than all the other functional groups 
Then comes sulphonic acid  -SO3Hand so on
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