Question

Ethene and ethyne differ in

• A. number of carbons
• B. number of bonds
• C. number of hydrogens
• D. Both (2) and (3)

Answer 1

The Correct Option is D

To determine the differences between ethene and ethyne, let's analyze their molecular structures and compositions:

Ethene (C₂H₄): Ethene is a hydrocarbon with the formula C₂H₄. It consists of two carbon atoms bonded together by a double bond, and each carbon atom is also bonded to two hydrogen atoms.

Ethyne (C₂H₂): Ethyne, commonly known as acetylene, has the molecular formula C₂H₂. It consists of two carbon atoms bonded by a triple bond, and each carbon atom is bonded to one hydrogen atom.

Based on these structures, we can deduce the differences:

• Number of Bonds: Ethene has one double bond between carbon atoms, while ethyne has a triple bond. This difference in bonding leads to differences in the chemical properties and reactivity of the compounds.
• Number of Hydrogens: Ethene has four hydrogen atoms, while ethyne has only two.
• Number of Carbons: Both ethene and ethyne have two carbon atoms, so there is no difference in the number of carbon atoms.

Therefore, ethene and ethyne differ in the number of bonds and the number of hydrogen atoms. The correct answer is: Both (2) and (3).

Answer 2

Correct answer: Both (2) and (3)

Explanation: 
- Ethene has the molecular formula \(C_2H_4\) and contains a double bond between carbon atoms.
- Ethyne has the molecular formula \(C_2H_2\) and contains a triple bond between carbon atoms.

So, the difference lies in:
- Number of bonds: Ethene has a double bond, while ethyne has a triple bond.
- Number of hydrogens: Ethene has 4 hydrogen atoms, while ethyne has only 2.

Therefore, the correct answer is Both (2) and (3).