Answer:
B
as the flows along the outside edge of a curve it removes rock and soil from the river bank
When formaldehyde and acetone then react with each other( aldol condensation) then it will be formed <u> methyl vinyl ketone.</u>
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In organic chemistry, an aldol condensation would be a condensation reaction in which an enol and enolate ion combines with a carbonyl chemical to produce a -hydroxy aldehyde or -hydroxy ketone, that is then dehydrated to produce a conjugated enone.
In aldol condensation, when formaldehyde and acetone then react with each other then it will be formed <u> </u><u>methyl vinyl ketone.</u>
It can be written as
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When it will be heated then it gives methyl vinyl ketones.
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So, the pair of reactants will be formaldehyde and acetone
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I think the answer is B. the sum of the enthalpy changes of the intermidiate reactions
They are different because they formed at different distances from the sun.