Which of the following compounds contains a c | vedclass

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(B) In $AlCl_3$,the electronegativity difference between $Al$ $(1.61)$ and $Cl$ $(3.16)$ is $1.55$. According to Fajan's rule,a small,highly charged c

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$AlCl_3$

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(B) In $AlCl_3$,the electronegativity difference between $Al$ $(1.61)$ and $Cl$ $(3.16)$ is $1.55$. According to Fajan's rule,a small,highly charged cation like $Al^{3+}$ has a high polarizing power,which causes significant polarization of the electron cloud of the $Cl^-$ anion,resulting in substantial covalent character in the $Al-Cl$ bond. The other options ($NaH$,$Na_2S$,and $MgCl_2$) are primarily ionic compounds.

Which of the following compounds contains a covalent bond?

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