Question

what is the molecular formula of a homologue of butane​

Answer 1

Answer:

C3H8 is the molecular formula of a homologue of butane as it satisfies the general formula CnH2n+2 of the alkane series.

Answer 2

The molecular formula of a homologue of butane​ is $C_5H_{10}$

Explanation:

A homologous series is a series of compounds with the same functional group and similar chemical properties in which the members of the series differ by the number of repeating units they contain.

The hydrocarbons containing single covalent bonds are called as alkanes is  and has suffix -ane. Butane has 4 carbon atoms in it with molecular formula of $C_4H_8$. The next homologue will have one more $-CH_2$ and thus the molecular formula will be $C_5H_{10}$.

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