Which of the following statements is true?

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(B) $1$. The coordination number of beryllium $(Be)$ is typically $4$ due to its small size,not $6$. $2$. Both $BeCl_2$ and $AlCl_3$ exist as polymeri

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Chlorides of both beryllium and aluminum form bridged complexes in the solid state.

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(B) $1$. The coordination number of beryllium $(Be)$ is typically $4$ due to its small size,not $6$. $2$. Both $BeCl_2$ and $AlCl_3$ exist as polymeric structures with bridged chloride atoms in the solid state. This is a correct statement. $3$. $B_3N_3H_6$ (borazine) is known as inorganic benzene,not $B_2H_6 \cdot 2NH_3$. $4$. Boric acid $(H_3BO_3)$ is a weak monobasic Lewis acid,not a protonic acid,as it accepts $OH^-$ ions from water to release $H^+$ ions.

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