Draw the structure of the major organic product(s) for the following reaction between an acetylenic anion and an alkyl halide. (
1 answer:
Answer:
See explanation below
Explanation:
In this case, we are having a reaction between an anion and alkyl halide. The carbon 1 of the anion will act as nucleophile and will attack the electrophile, which is 5 carbon chain with the bromine in the third carbon.
Now, the nucleophyle is an alkyne of 3 carbon. According to the description, it should be:
CH₃ - C ≡ C⁻
And the alkyl halide is:
CH₃ - CH₂ CH(Br) - CH₂ - CH₃
And the final product after the reaction would be the following:
CH₃ - C ≡ C - CH - (CH₂CH₃)₂
However, in the attached picture you can see this better and the mechanism of reaction.
Hope this helps
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Answer : Formation of yellow precipitate is the physical evidence that there has been a chemical reaction.
Explanation :
A chemical reaction happens when 2 or more substances chemically react with each other.
There are 4 evidences indicating that a chemical reaction has occurred which are mentioned below.
1. Change in color : On mixing, the reaction mixture can change color indicating that a chemical change may have occurred.
2. Formation of precipitate : A reaction in which a solid is formed on mixing 2 aqueous solutions is called as precipitation reaction. Here, the formation of solid indicates a chemical change.
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In above reaction, on mixing the solutions, a white precipitate of AgCl is formed which indicates a chemical change.
3. Evolution of gas : A chemical change also occurs when a gas is evolved on mixing 2 substances.
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In above reaction, CO2 gas is evolved and bubbles can be seen in the form of effervescence.
4. Change in temperature : Certain chemical reactions absorb or evolve heat. When a chemical reaction evolves heat, the temperature of the final reaction mixture increases and when it absorbs heat, the temperature decreases. This increase and decrease in temperature indicates a chemical change.
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In above reaction, the final mixture becomes hot as the reaction releases heat. ( Exothermic)
Change in odor also indicates a chemical change.
For the given reaction, a yellow precipitate of PbI2 is getting formed.
Therefore formation of this precipitate is the physical evidence that there has been a chemical reaction.