Write the molecular formula of the 2^nd and the 3^rd member of the homologous series whose first member is methane.

Academic Chemistry NCERT Class 10

The molecular formula of the 2nd and the 3rd member of the homologous series whose first member is methane are:

Ethane (C₂H₆)
Propane (C₃H₈)

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Updated on: 10-Oct-2022

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Write the molecular formula of the 2nd and 3rd member of the homologous series where the first member is ethyne.
Write the molecular formula of the 2nd and 3rd members of the homologous series where the first member is ethyne.
The first member of the alkyne homologous series is propyneethynemethaneethene
The first member of the alkyne homologous series isethyneethenepropynemethane
(a) Give the general name of the class of compounds having the general formula CnH2n-2 Write the name of the first member of this homologous series.(b) The general formula of a homologous series of carbon compounds is CnH2n. Write the molecular formula of the second and fourth members of the series. (c) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula CnH2n+2.
Write the molecular formula of first two members of homologous series having functional group -Br.
(a) Define a homologous series. Give the name and structural formula of one homologue of the following: CH3OH.(b) Write the molecular formula of the third member of the homologous series of carbon compounds with general formula CnH2n+ 1OH. (c) Name any two fossil fuels.
A colourless organic liquid X of molecular formula C2H4O2 turns blue litmus to red. Another colourless organic liquid Y of molecular formula C3H6O has no action on any litmus but it is used as a nail polish remover. A yet another colourless organic liquid Z of molecular formula C2H6O has also no action on litmus but it is used in tincture of iodine.(a) Name the liquid X. To which homologous series does it belong? Give the name of another member of this homologous series. (b) Name the liquid Y. To which homologous series does it belong? Write the name of another member of this homologous series. (c) Can you name an organic compound having the same molecular formula as liquid Y but which belongs to a different homologous series? What is this homologous series? (d) Name the liquid Z. To which homologous series does it belong? Write the name of another member of this homologous series.
Give the name and structural formula of one member of the following: Alcohols
Why certain compounds are called hydrocarbons? Write the general formula for homologous series of alkanes, alkenes and alkynes and also draw the structure of the first member of each series. Write the name of the reaction that converts alkenes into alkanes and also write a chemical equation to show the necessary conditions for the reaction to occur.
Write the molecular formula of ethanol.
(a) Give the names and structural formulae of the next two higher homologues of methane.(b) The molecular formula of a hydrocarbon is C10H18. Name its homologous series. (c) Select the hydrocarbons which are members of the same homologous series. Give the name of each series. C5H10 ; C3H8 ; C6H10 ; C4H10 ; C7H12 ; C8H16.
Assertion (A): In a homologous series of alcohols, the formula for the second member is C2H5OH and the third member is C3H1OH.Reason (R): The difference between the molecular masses of the two consecutive members of a homologous series is 144.(a) Both A and R are true and R is the correct explanation of the Assertion.(b) Both A and R are true but R is not the correct explanation of the Assertion.(c) A is true but R is false.(d) A is false but R is true.
Write the molecular formula of the following compounds:
(a) Give the name and structural formula of one member each of the following:(i) alkane ; (ii) alkene ; (iii) alkyne ; (iv) cycloalkane. (b) Give the common name of (i) ethyne, and (ii) ethene. (c) Write the molecular formula and structure of benzene.

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