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Mg2C3 reacts with water forming propyne, C34- has:
- a)two sigma and two pi bonds
- b)three sigma and one pi bonds
- c)two sigma and three pi bonds
- d)two sigma and one pi bonds
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Mg2C3 reacts with water forming propyne, C34- has:a)two sigma and two ...
Explanation:
When Mg2C3 reacts with water, it forms propyne (CH3C≡CH). To understand the number of sigma and pi bonds present in C34-, we need to draw its Lewis structure.
Steps to draw Lewis structure:
From the Lewis structure, we can see that there are two sigma bonds (one between each carbon and the central carbon) and two pi bonds (formed by the triple bond between the two carbons). Therefore, the correct answer is option A.
When Mg2C3 reacts with water, it forms propyne (CH3C≡CH). To understand the number of sigma and pi bonds present in C34-, we need to draw its Lewis structure.
Steps to draw Lewis structure:
- Calculate the total valence electrons by adding the valence electrons of all atoms. In this case, it will be 4 (carbon) + 3 (three electrons in each of the two carbides) + 1 (extra electron since C34- has a negative charge). Therefore, the total valence electrons will be 4+3x2+1=11.
- Connect the atoms using single bonds.
- Place the remaining electrons to satisfy the octet rule of each atom. In this case, carbon has 7 electrons, so it needs 1 more electron to complete its octet. Therefore, the remaining electron will form a triple bond with another carbon atom.
From the Lewis structure, we can see that there are two sigma bonds (one between each carbon and the central carbon) and two pi bonds (formed by the triple bond between the two carbons). Therefore, the correct answer is option A.
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Community Answer
Mg2C3 reacts with water forming propyne, C34- has:a)two sigma and two ...
Answer A is correct because the C34- ion in Mg2C3 is a linear acetylide ion with a triple bond between the two carbon atoms. In a triple bond, there are one sigma bond and two pi bonds. A sigma bond is a single covalent bond formed by the direct overlap of bonding orbitals, whereas pi bonds are formed by the sideways overlap of p orbitals. So, in the C34- ion, there are two sigma bonds (one between the two carbon atoms and one between a carbon and a metal atom) and two pi bonds (both in the triple bond between the two carbon atoms). This is in accordance with the chapter on Chemical Bonding and Shapes of Compounds in Inorganic Chemistry, which discusses the different types of covalent bonds and their formation in various compounds.
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Mg2C3 reacts with water forming propyne, C34- has:a)two sigma and two pi bondsb)three sigma and one pi bondsc)two sigma and three pi bondsd)two sigma and one pi bondsCorrect answer is option 'A'. Can you explain this answer?
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