Which of the given compounds can act as a Lewis acid in both monomer and dimer form?

CHEMISTRY · Single correct · CBSE · Chemistry · Chemical Bonding and Molecular Structure · Chemical Bonding and Molecular Structure

Problem

Which of the given compounds can act as a Lewis acid in both monomer and dimer form? (1)

\text{BH}_3

(2)

\text{BeCl}_2

(3)

\text{BeH}_2

(4)

\text{AlCl}_3