Q39 of 312 Page 241

What is meant by a functional group? Explain with an example.

A atom or group of atoms which determine the properties of compound is known as functional group. Example; alcohol (-OH), aldehyde (-CHO), etc.

Alcohol group (-OH) is a functional group which is present in ethanol (C2H5OH).



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38 Select the hydrocarbons which belong to the same homologous series. Give the name if of each series.

CH4, C2H2, C2H4, C2H6, C4H10, C3H4, C3H6,

 38 What is meant by ‘heteroatom’? Give examples. Write the names and formulae of two organic compounds containing different heteroatoms. 39 Write three common functional groups present in organic compounds. Give their symbols/formulae. 39 Name the functional groups present in the following compounds:

(i) CH3COOH (ii)CH3CH2CH2CHO (iii) C2H5OH (iv) CH3COCH2CH3