Question

select alkenes and alkynes from the following
options:
1) C2H4
2) C3H4
3) C2H2
4) C4H8

Answer 1

Answer:

Alkenes are C2 H5 , C4 H8

Alkynes are C3 H4, C2 H2

Explanation:

Answer 2

Alkene- $C_2H_4, C_4H_8$.

Alkyne- $C_3H_4, C_2H_2$.

• Alkene contains a double bond. The general formula of an alkane is $C_nH_{2n}$.
• Thus only $C_2H_4, C_4H_8$ satisfy the above condition of alkene. So, $C_2H_4, C_4H_8$ are the alkenes.
• Alkyne contains a triple bond. The general formula of an alkane is $C_nH_{2n-2}$.
• Thus only $C_2H_2, C_3H_4$ satisfy the above condition of alkene. So, $C_2H_2, C_3H_4$ are the alkynes.