H -bonding is the reason for dimerisation of:

1. ${\mathrm{NO}}_2\left(\mathrm{s}\right)$
2. ${\mathrm{BeCl}}_2\left(\mathrm{s}\right)$
3. ${\mathrm{CH}}_3\mathrm{COOH} \left(\mathrm{g}\right)$
4. ${\mathrm{H}}_3{\mathrm{BO}}_3\left(\mathrm{s}\right)$

Solution

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Asked in: JEE-TOPICTESTS-CHEMISTRY

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