Write first five members of the homologous series of alkenes. [3 marks]

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Solution

The general formula of alkenes is $C_{n} H_{2 n}$ .
With n=1 alkenes are not possible. So, the members of alkenes generally start from n=2. [0.5 marks]

The first member of the homologous series (n=2) is $C_{2} H_{4} (C H_{2} = C H_{2})$ . [0.5 marks]
The second member of the homologous series (n=3) is $C_{3} H_{6} (C H_{3} C H = C H_{2})$ . [0.5 marks]
The third member of the homologous series (n=4) is $C_{4} H_{8} (C H_{3} C H_{2} C H = C H_{2})$ . [0.5 marks]
The fourth member of the homologous series (n=5) is $C_{5} H_{10} (C H_{3} C H_{2} C H_{2} C H = C H_{2})$ . [0.5 marks]
The fifth member of the homologous series (n=6) is $C_{6} H_{12} (C H_{3} C H_{2} C H_{2} C H_{2} C H = C H_{2})$ . [0.5 marks]

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