1. IgM
During first exposure to an pathogen IgM will be produced. It is the antibdy present during primary immune response
2. IgG
IgGis a part of first level of defence of innate immunity as it can cross the placenta of mother and enter into foetal circultion. IgG antibodies take part mainly in secondary immune response or they are secereted in large amount during secondary exposure to an antigen. This is the most circulating antibody in the immune system.
3.There is a mistake in question
4.Two heavy chain and two light chain is present in IgG, the most commmon antibody.
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