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C2H2 lewis structure: 

 

The central atom in C2H2 is carbon and it has 4 valence electrons, Two Carbon atoms in C2H2 means eight valence electrons for Carbon atoms. Each hydrogen atom has one valence electron, 2 valence electrons for 2 H atoms. Total valence electrons are 10.


The carbon atoms form a triple bond with each other sharing 6 electrons and each C atom forms a single bond with hydrogen atoms and complete their respective octets.

 

H:C:::C:H

 

The triple bond is represented by 6 dots (each dot represents one electron) between two C atoms and a single bond is represented by two dots between C and H atoms.

 

C2H2 lewis structure Sample Questions:

 

Question 1: How many total valence electrons are in C2H2?

 

a) 2                        b) 6
c) 8                        d) 10

 

Answer: Option d) 10

Explanation: The central atom C2H2 in is carbon and it has 4 valence electrons, Two Carbon atoms in C2H2 means eight valence electrons for Carbon atoms. Each hydrogen atom has one valence electron, 2 valence electrons for 2 H atoms. Total valence electrons are 10.

 

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Question 2: The number of single bonds C2H2 in is-

 

a) 1                            b) 2
c) 3                            d) 4

 

Answer: Option b) 2

Explanation: The central atom in C2H2 is carbon and it has 4 valence electrons. Each hydrogen atom has one valence electron. Both C share 6 electrons to form a triple bond and both C share 2 electrons with one of the H atom and form single bonds with them.

 

 

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Question 3: The number of nonbonding electrons in ethyne molecule is?

 

a) 0                                  b) 1
c) 2                                  d) 4

 

Answer: Option a) 0

Explanation: The central atom in C2H2 is carbon and it has 4 valence electrons. Each hydrogen atom has one valence electron. Bothe C share 6 electrons to form a triple bond and both C share 2 electrons with one of the H atom and form single bonds with them. All of the valence electrons are used in bonding and there’s no nonbonding electrons left.

 

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Question 4: What is the molecular shape of C2H2?

 

a) Bent                          b) Linear
c) Pyramidal                 d) Trigonal planar

 

Answer: Option b) Linear

Explanation: The bond angle in C2H2 molecule is 180 and the geometry of the molecule is linear.

 

 

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Question 5: What is the number of bond pairs in C2H2 molecule?

 

a) 2                          b) 3
c) 4                          d) 5

 

Answer: Option d) 5

Explanation: Total valence electrons in C2H2 are 10. The carbon atoms form a triple bond with each other sharing 6 electrons and each C atom forms a single bond with hydrogen atoms sharing two electrons per bond. Total number of bond pairs is 5. 

 

 

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Question 6: What is the number of triple bonds in C2H2?

 

a) 0                            b) 1
c) 2                            d) 3

 

Answer: Option b) 1

Explanation: The carbon atoms form a triple bond with each other sharing 6 electrons and each C atom forms a single bond with hydrogen atoms and complete their respective octets. 

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Question 7: Which of the following statements is correct about C2H2 Lewis structure?

 

a) There are two triple bonds           
b) There are 5 bond pairs
c) There are 2 lone pairs         
d) The geometry of the molecule is bent

 

Answer: Option b)

Explanation: Total valence electrons in C2H2 are 10. The carbon atoms form a triple bond with each other sharing 6 electrons and each C atom forms a single bond with hydrogen atoms sharing two electrons per bond. Total number of bond pairs is 5. 

 

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Question 8: Which of the following statements about lewis structure of C2H2 is not true?

 

a) It is a linear molecule.                       
b) It has a triple bond.
c) It has two double bonds.                        
d) It has no lone pairs.

 

Answer: Option c) It has two double bonds.

Explanation: The carbon atoms form a triple bond with each other sharing 6 electrons and each C atom forms a single bond with hydrogen atoms and complete their respective octets. There isn’t any double bond. 

 

 

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Question 9: C2H2 follows the octet rule?

 

a) True 
b) False
 

Answer: True

Explanation: According to octet rule each atom tries to achieve a stable condition by stabilizing the number of valence electrons, which is 8 electrons for C and 2 electrons for H. O has 4 valence electrons and H has 1 valence electrons and they need 4 and 1 electron respectively to complete their octet. Both the C atoms share 6 electrons among each other and form a triple bond, and two electrons with H atom and form a single bond with H atom. Hence, in C2H2 Each C atom is surrounded by 8 and each H atom is surrounded by 2 electrons.


Therefore, C2H2 follows the octet rule.

 

 

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Question 10: The two dots on an atomic symbol represent ?

 

a) Lone pair
b) Single bond
c) Double bond
d) An unpaired electron

 

Answer: Lone pair

Explanation: In Lewis structures, a lone pair is represented by a couple of solid dots placed on atomic symbol

 

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Frequently Asked Questions

 

 

What is the lewis structure for C2H2?


Carbon atom is the central atom in C2H2 and it has four valence electrons, there are two Carbon atoms in C2H2 we will multiply the number by 2. Hence there are eight valence electrons for Carbon atoms. Hydrogen atoms have one valence electron, for two H atoms the number of valence electrons is 2. Total valence electrons are 10.
Both the carbon atoms form a triple bond with each other by sharing 6 electrons and a single bond with one hydrogen atom and complete their respective octets.

 

H:C:::C:H

 

The triple bond is represented by six dots (each dot represents one electron) between two C atoms and a single bond is represented by two dots between C and H atoms.

 

 

What is the lewis dot structure for C2H2?

 

Carbon atom is the central atom in C2H2 and it has four valence electrons, there are two Carbon atoms in C2H2  we will multiply the number by 2. Hence there are eight valence electrons for Carbon atoms. Hydrogen atoms have one valence electron, for two H atoms the number of valence electrons is 2. Total valence electrons are 10.
Both the carbon atoms form a triple bond with each other by sharing 6 electrons and a single bond with one hydrogen atom and complete their respective octets.

 

H:C:::C:H

 

The triple bond is represented by six dots (each dot represents one electron) between two C atoms and a single bond is represented by two dots between C and H atoms.

 

 

What is the molecular shape of C2H2?

 

C2H2 is a tetratomic molecule and has all the atoms symmetrically lying in the same plane. The carbon is triple bonded to other carbon and that gives the molecule linear shape with bond angle = 180.

 

Acetylene

 

 

 

Does C2H2 follow the octet rule?

 

Octet rule states that each atom tries to achieve a stable condition by stabilizing the number of valence electrons, which is eight electrons for C and two electrons for H. O has 4 valence electrons and H has one valence electrons and they need 4 and 1 electron respectively to complete their octet. Both the carbon atoms share 6 electrons among each other and form a triple bond, and two electrons with H atom and form a single bond with H atom. Hence, in C2H2 Each C atom is surrounded by 8 and each H atom is surrounded by 2 electrons.

Therefore, C2H2 follows the octet rule.

 

 

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