![]() the one with the highest energy that still contains electrons. HOMO is a widely used abbreviation for the Highest Occupied Molecular Orbital, i.e. Thus, the carbon monoxide molecule is one that won’t react with water at all and totally defies the concept of acidic/basic oxides. ![]() However, it is also degenerate due to the double bond so that an attack is not favoured. The LUMO is, luckily, also more carbon-centred, meaning nucleophilic attacks on carbon are possible. If you check out its molecular orbitals, you will notice that even though carbon is partially positive it has the largest HOMO contribution, meaning a proton would be more likely to attatch to the carbon side - which doesn’t want one at all. $\ce$) which can be attacked by the weak nucleophile water (which in turn can then release an acidic proton), or they have a high charge density on the oxygen which allows it to abstract a proton from water directly. Most oxides that are classified as acidic or basic either have a very electrophilic central atom (e.g. And your question mentions using hot, concentrated sodium hydroxide to make the reverse one work. However, the forward reaction does not proceed easily and it needs both the high acidity of sulphuric acid and its strong dehydrative properties to actually work. Therefore, we can imagine the reverse reaction theoretically, which would make carbon monoxide an acidic oxide. Well, carbon monoxide can be created from formic acid by adding sulphuric acid which will dehydrate said formic acid:
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