Question
  1. Define the term functional group. Identify the functional group present in
  1. $\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{\text{O}}\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\parallel\\ \text{H}\text{ }- \text{C}\text{ }-\text{H}\text{ }$
  2. $\ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \text{OH} \\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \\ \text{H}-\text{C}-\text{C}=\text{O}\\ \ \ \ \ \ \ \ \ \ \text{|} \\ \ \ \ \ \ \ \ \ \text{H}$
  1. What happens when 5% alkaline $KMnO_4$ solution is added drop by drop to warm ethanol taken in a test tube? State the role of alkaline $KMnO_4$ solution in this reaction.

Answer

  1. The functional group is defined as an atom or group of atoms joined in a specific manner, which gives the chemical properties of the organic compound and are the centers for chemical reactivity.
  1. Aldehyde group.
  2. Carboxylic acid.
  1. The $KMNO _4$ turns to green $K _2 MNO _4$ which then again gets converted to MNo 2 which discharges brown colour which serves as the test for unsaturation for ethane.

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