CBSE Class 10 Science 2017 · Paper 31/1 · Question 1

Carbon and its Compounds 1 mark Easy

Write the molecular formula of the

2^{nd}

and the

3^{rd}

member of the homologous series whose first member is methane.

Answer

The second and third members are ethane, $C_{2} H_{6}$ , and propane, $C_{3} H_{8}$ .

The series that begins with methane is the alkanes,

C_{n} H_{2 n + 2}

. Second member: ethane,

C_{2} H_{6}

. Third member: propane,

C_{3} H_{8}

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