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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 difference between two consecutive homologues:
(1) in terms of molecular mass?
(2) in terms of number and kind of atoms per molecule?
By how many carbon atoms and hydrogen atoms do any two adjacent homologues differ?
Write the names and formulae for the first three members of the homologous series for chloroalkanes.
Give the dot diagram of the first member of the alcohol.
.
Write the name and formula of the fourth member of the following homologous series:
Alkyne
Study and complete the following table:
| Homologous series | Alkane | Alkyne |
| General formula | CnH2n+2 | 1. ______ |
| IUPAC name | 2. ______ | Ethyne |
| Common name | Marsh gas | 3. ______ |
Consider the following molecular formulae of carbon compounds:
(i) CH3COOH (ii) CH3OH (iii) C2H6 (iv) C3H4 (v) C4H8
- Which one of these compounds belongs to homologous series of alcohols?
- Identify the compound having triple bond between carbon-carbon atoms.
- Write the molecular formula of the first member of the homologous series to which CH3COOH belongs.
- Write the general formula of the series to which the compound C4H8 belongs.
Name the third homologue of aldehydes.
