Question
Why is $\mathrm{BeCl}_2$ linear whereas $\mathrm{SnCl}_2$ angular molecule?
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Answer
$\mathrm{BeCl}_2$ is linear due to sp hybridisation and 2 boned pair (bp) of electrons and no lone pair (lp). In $\mathrm{SnCl}_2$, there is sp hybridisation with a lone pair of electron, it is bent molecule.
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