The melting pt. of group 13 follows the order

The melting pt. of group 13 follows the order
  1. $\quad \mathrm{B}>\mathrm{Al}>\mathrm{Ga}>\mathrm{In}>\mathrm{Tl}$
  2. $\quad \mathrm{B}>\mathrm{Al} < \mathrm{Ga}>\mathrm{In}>\mathrm{Tl}$
  3. $\quad \mathrm{B}>\mathrm{Al}>\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}$
  4. $\quad \mathrm{B}>\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}$

Solution

Due to structural changes, melting point, increases from Ga to Tl and Ga has the lowest melting point. ^

Asked in: JEE-TOPICTESTS-CHEMISTRY

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