Mole concept, Chemistry

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What is mole concept?

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If electron falls from n=3  to n= 2 , then emitted energy is: (1) 10.2ev                            (2) 12.09 ev           (3) 1.9ev                              (4)0

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What is the maximum number of electrons which can be accommodated in an atom in which the highest principal quantum number value is 4: (1) 10        (2) 18      (3) 32

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show how you would sythesise the following compounds, starting with benzene or toluene and any necessary acyclic reagents. Assume para is the major product.

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