Correct order of first ionization energy is
1) C>Si>Ge>Sn>pb
2) C>pb>Si>Ge>Sn
3) Si>C>Pb>Ge>Sn
4) C>Si>Ge>Pb>Sn
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4) C > Si > Ge > Pb > Sn
would be the correct order of first ionization energy
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