1. A homologous series is a group of organic compounds having similar structures and similar chemical properties in which the successive compounds differ by -CH2 group. For example, general formula of the homologous series of alkanes is CnH2n+2, in which ‘n’ denotes number of carbon atoms in one molecuRead more

    A homologous series is a group of organic compounds having
    similar structures and similar chemical properties in which the successive compounds differ by -CH2 group.

    For example, general formula of the homologous series of alkanes is CnH2n+2, in which ‘n’ denotes number of carbon atoms in one molecule of alkane. Following are the first five members of the homologous series of alkanes (general formula CnH2n+2).

    Value of n Molecular formula Name of compound
    1 CH4 Methane
    2 C2H6 Ethane
    3 C3H8 Propane
    4 C4H10 Butane
    5 C5H12 Pentane
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  2. Covalent bond is formed by sharing of electrons so that the combining atoms complete their outermost shell. In CH3Cl : C = 6, H = 1 and Cl = 17 And their electronic configuration is C – 2,4, H – 1 and Cl – 2, 8, 7 Three hydrogen atoms complete their shells by sharing three electrons (one electron eaRead more

    Covalent bond is formed by sharing of electrons so that the combining atoms complete their outermost shell.

    In CH3Cl : C = 6, H = 1 and Cl = 17 And their electronic configuration is C – 2,4, H – 1 and Cl – 2, 8, 7

    Three hydrogen atoms complete their shells by sharing three electrons (one electron each) of carbon atom.
    Chlorine completes its outer shell by sharing its one out of seven electrons with one electron of carbon atom.
    Thus carbon atom shares all its four electrons with three hydrogen atoms and one of chlorine atom and completes its outermost shell and single covalent bonds are formed in CH3Cl.

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  3. (b) While cooking, if the bottom of the vessel is getting blackened on the outside, the fuel is not burning completely.  

    (b) While cooking, if the bottom of the vessel is getting blackened on the outside, the fuel is not burning completely.

     

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