Alkanes

Alkanes are the saturated hydrocarbons having general formula CnH2n+2. Alkanes are also called as paraffins because of their inertness towards most reagents. The IUPAC names of alkanes end with suffix ‘ane’. The first part that is prefix of the name indicates the number of carbon atoms present in the chain. Alkanes can be prepared in the laboratory by the decarboxylation reaction. Methane is the first member of the series of alkane. It is a colourless and odourless gas, insoluble in water but soluble in organic solvents. Ethane is the second member of alkane series. It is also a colourless, odourlesss, non-poisonous gas. Methane and ethane does not react with bases such as sodium hydroxide or with oxidizing agents such as potassium permanganate or with reducing agents such as sodium metal. Alkanes undergo substitution reactions, decomposition reactions, catalytic oxidation and combustion reactions.

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  • Q1

    Methane is prepared by adding water to:

    Marks:1
    Answer:

    aluminium carbide (Al4C3)

    Explanation:

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  • Q2

    Marks:1
    Answer:

    sodium acetate

    Explanation:

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  • Q3

    Geometry of methane molecule is

    Marks:1
    Answer:

    tetrahedral.

    Explanation:

     

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  • Q4

    on heating to a temperature of 1000°C, methane decomposes into its constituent elements. This reaction is known as

    Marks:1
    Answer:

    Pyrolysis.

    Explanation:

    When methane is heated at 1000°C, it decomposes to its constituent elements i.e. carbon and hydrogen. This reaction is known as cracking or pyrolysis.

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  • Q5

    An alkane which is used as a domestic fuel is

    Marks:1
    Answer:

    methane.

    Explanation:

    Methane is widely used as domestic fuel.

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