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Macro Expansion is done in which phase of compiler ?

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It is not done during compilation- rather just before it. This is done as by macro processor which is before any of the compilation phase. You can see the output of macro expansion by using "-E" option in gcc. 

gcc -E file.c
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As per Compiler Book by AHO

If the source program uses a macro-preprocessor, the expansion of macros may also be performed by the lexical analyzer.
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