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2 years ago

Which pair of reactants will undergo aldol condensation to produce methylvinyl ketone?

1 answer:

6 0

When formaldehyde and acetone then react with each other( aldol condensation) then it will be formed methyl vinyl ketone.

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 methyl vinyl ketone.

It can be written as

$CH_{2} O + CH_{3} COCH_{3}$ → $HOCH_{2} -CH_{2} -CO-CH_{3}$

When it will be heated then it gives methyl vinyl ketones.

$HOCH_{2} -CH_{2} -CO-CH_{3}$ → $CH_{2} =CH-CO-CH_{3}$

So, the pair of reactants will be formaldehyde and acetone

To know more about aldol condensation

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Answers:

The true statements are:

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c. It is now arranged by increasing atomic number instead of increasing atomic mass.

Justification:

Dimitri Mendeleev (1834 - 1907) created the first useful and widely accepted periodic table. He organized the elements in increasing order of atomic masses, and found a pattern on their properties. He left blank spaces when found that some properties did not follow the patterns, and was able to predict the existence of unknwon elements along with their properties.

Let's see every proposed statement comparing the current (modern) periodic table to establish its validity:

a. It contains more elements than Mendeleev's periodic table

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This is false. Mendeleev grouped the elements in ascending number of atomic masses and arranged them in rows and columns according to the similarity in their properties.

c. It is now arranged by increasing atomic number instead of increasing atomic mass.

True. As said, Meedeleev arranged by increasing atomic number. This caused that some elements appeared placed in groups with elements of different properties. It was Henry Moseley, by 1913, who discovered that the order by the number of protons (atomic number) was more appropiated.

d. The atomic masses on the modern periodic table are much different than they were on Mendeleev's periodic table

False. Except for counted exceptions (i.e. Cerium), the atomic masses on modern periodic table differ slightly of those in Mendeleev's periodic table (in the tenths units mainly). The main reason of these tiny discrepances is the change of the pattern (originally hydrogen and oxygen were used as the standards and currently the standard is the isotope carbon-12).

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