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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 next homologue of the following: C2H4
Classify the following carbon compounds into two homologous series and name them.
C3H4, C3H6, C4H6, C4H8, C5H8, C5H10
Give the molecular formula of one homologue of each of the following:
C2H6
The molecular formula of the third member of the homologous series of ketones is:
(a) C4H8O
(b) C3H6O
(c) C5H10O
(d) C6H12O
Write names of first four homologous series of alcohols.
Give three points to differentiate between saturated and unsaturated
hydrocarbons.
As one ascends in any homologous series, physical properties change gradually.
Complete the following table for homologous series of Alkenes.
| Name | Molecular formula | Condensed structural formula | Number of carbon atom | Number of -CH2- units | Boiling point °C |
| Ethene | C2H4 | CH2 = CH2 | 2 | 0 | -102 |
| Propene | C3H6 | CH3–CH = CH2 | 3 | 1 | -48 |
| 1-Butene | C4H8 | CH3–CH2–CH = CH2 | ______ | ______ | -6.5 |
| 1-Pentene | C5H10 | CH3–CH2–CH2–CH = CH2 | ______ | ______ | 30 |
Complete the following chart by using examples given in brackets.
(isobutylene, cyclohexane, propane, cyclohexene, cyclopentane, benzene, propyne, isobutane, propene)
| Straight chain hydrocarbons | Branched chain hydrocarbons | Cyclic hydrocarbons |
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.
