IMAT 2016 Q43 [Functional Groups]

The formula of a molecule is CH_2CHCH_2CH_2COCH_2CHO.

Which functional groups given below are present in the molecule?

  1. alkene
  2. alcohol
  3. aldehyde
  4. ketone

A. 1, 3 and 4 only
B. 2, 3 and 4 only
C. 1 and 4 only
D. 1, 2 and 3 only
E. 3 and 4 only

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Going from left to right we encounter 3 key functional groups:

  1. CH_2CHCH_2, this represents an alkene. We know this since we can assume a double bond between the carbons.

  2. CO, which represents a ketone’s functional group.

  3. CHO, which is an aldehyde’s functional group.

Therefore our answer is options 1, 3 and 4. Which is A.