(C) $1$. $A$ Lewis acid is defined as an electron pair acceptor.$2$. In $BeCl_2$, the central atom $Be$ has only $4$ electrons in its valence shell, w

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(C) $1$. $A$ Lewis acid is defined as an electron pair acceptor.$2$. In $BeCl_2$, the central atom $Be$ has only $4$ electrons in its valence shell, which is less than the octet ($8$ electrons).$3$. Due to this electron deficiency, $BeCl_2$ can accept an electron pair to complete its octet, thus acting as a Lewis acid.