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प्रश्न
Write the molecular formula of two consecutive members of homologous series of aldehydes. State which part of these compounds determines their
- physical and
- chemical properties
Write the molecular formula of any two consecutive members of homologous series of aldehydes.
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उत्तर १
The molecular formula of two consecutive members of homologous series of aldehydes:-
\[\ce{CH3 - CHO}\] and \[\ce{CH3 - CH2 - CHO}\]
In \[\ce{CH3 - CHO}\] compound, \[\ce{-CHO}\] part and in \[\ce{CH3 - CH2 - CHO}\], \[\ce{-CH2-CHO}\] part will determine their physical and chemical properties.
उत्तर २
Two consecutive members:
| Molecular Formula | Structure | |
| Methanal (Formaldehyde) | \[\ce{CH2O}\] | \[\ce{H - CHO}\] |
| Ethanal (Acetaldehyde) | \[\ce{C2H4O}\] | \[\ce{CH3 - CHO}\] |
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
Write the name and formula of the 2nd member of homologous series having general formula CnH2n – 2.
What is the next higher homologue of methanol (CH3OH)?
The molecular formula of the third member of the homologous series of ketones is:
(a) C4H8O
(b) C3H6O
(c) C5H10O
(d) C6H12O
Define homologous series of organic compounds. List its two characteristics. Write the name and formula of the first member of the series of alkenes.
The unsaturated hydrocarbons containing a carbon-carbon double bond are called _______.
The phenomenon in which compounds having different structural formulae have the same molecular formula is called _______.
Complete the following table for homologous series of alcohols.
| Name | Molecular formula | Condensed structural formula | Number of carbon atom | Number of -CH2- units | Boiling point °C |
| Methanol | CH4O | CH3-OH | 1 | 1 | 63 |
| Ethanol | C2H6O | CH3–CH2-OH | 2 | 2 | 78 |
| Propanol | C3H8O | CH3–CH2–CH2-OH | ______ | ______ | 97 |
| Butanol | C4H10O | CH3–CH2–CH2–CH2–OH | ______ | ______ | 118 |
Observe the structural formula and answer the following questions.
- Write the name of the given hydrocarbon.
- The given hydrocarbon is included in which type of hydrocarbon?
- What is the kind of compounds with the above characteristic structure called?
Successive members of a homologous series vary by how many atomic mass unit?
Define Homologous series.
