Better method preparation |GeneralOrganiChemistyJEEMAIN2023

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JEE MAIN 2023

13-4-23 S2

Question

Better method for preparation of BeF2, among the following is:
(1) $\left(\mathrm{NH}_4\right)_2 \mathrm{BeF}_4 \xrightarrow{\Delta} \mathrm{BeF}_2$
(2) $\mathrm{BeH}_2+\mathrm{F}_2 \xrightarrow{\Delta} \mathrm{BeF}_2$
(3) $\mathrm{Be}+\mathrm{F}_2 \xrightarrow{\Delta} \mathrm{BeF}_2$
(4) $\mathrm{BeO}+\mathrm{C}+\mathrm{F}_2 \xrightarrow{\Delta} \mathrm{BeF}_2$

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Solution

Sol. As per NCERT (s block), the better method of preparation of BeF2 is heating . $\left(\mathrm{NH}_4\right)_2 \mathrm{BeF}_4$ $\left(\mathrm{NH}_4\right)_2 \mathrm{BeF}_4 \xrightarrow{\Delta} \mathrm{BeF}_2+\mathrm{NH}_4 \mathrm{~F}$

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