The correct order of the first ionization enthalpy is

The correct order of the first ionization enthalpy is
  1. \(\mathrm{Al} > \mathrm{Ga} > \mathrm{Tl}\)
  2. \(\mathrm{Ga} > \mathrm{Al} > \mathrm{B}\)
  3. \(\mathrm{Tl} > \mathrm{Ga} > \mathrm{Al}\)
  4. \(\mathrm{B} > \mathrm{Al} > \mathrm{Ga}\)

Solution

(i) due to lanthanide contraction $\mathrm{T} \ell$ has more I.E. as compared to $\mathrm{Ga}$ and $\mathrm{A} \ell$ (ii) due to scandide contraction Ga has more I.E. as compared to $\mathrm{A} \ell$

Asked in: JEE Main 2024 (04 Apr Shift 2)

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