Which of the following is the correct special suffix for the functional group when it is directly attached to an alicyclic ring or when three or more such groups are attached to an unbranched chain?

Question

Which of the following is the correct special suffix for the $-CHO$ functional group when it is directly attached to an alicyclic ring or when three or more such groups are attached to an unbranched chain?

Prashant Kotian · Accepted Answer

Correct answer: A. When a carbon-containing chain-terminating group is directly attached to a ring, or when three or more identical such groups are present on an unbranched chain, special suffixes are used. For the aldehyde group (), the special suffix is "carbaldehyde" because its carbon is excluded from the principal chain counting.

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