Question

(a) What is the general formula of alkenes? Identify the alkenes from the following
C2H6, C2H4, C3H4, C2H2, C3H6
(b) Which of the following can give addition reactions?
C2H6, C3H8, C3H6, C2H2, CH4
​Give reason for your choice.

Answer 1

Answer:

a) Cn H2n

The alkenes are C2H4 and C3H6

b) C2H6, C3H6 and C2H2

Answer 2

(a) The general formula of alkene is CnH2n. From the below alkenes,$C_3 H_6$ and $C_2 H_4$ are identified as alkenes.  

(b) Hydrocarbons enduring addition reactions are unsaturated. From the provided compounds, $C_2 H_2$ and $C_3 H_6$ are identified as the compounds undergoing addition reactions.

Explanation:

• In the formula of alkene, $CnH_2 n$, ‘n’ denotes the carbon atoms’ number. The formula of $C_3H_6$and $C_2 H_6$ is formed from the base of alkene formula.
• The formula for alkane is $C n H_{2} n+2$. This shows that the addition reactions are provided by alkenes.