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Homologous Series

The molecular...

Question

The molecular formula of the third member of the homologous series of ketones is :
(a) $C_{4} H_{8} O$ (b) $C_{3} H_{6} O$ (c) $C_{5} H_{10} O$ (d) $C_{6} H_{12} O$

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Solution

(c) $C_{5} H_{10} O$
The molecular formula of the third member from the homologous series of ketones is $C_{5} H_{10} O$ (Pentanone or $C_{2} H_{5} - O | | C - C_{2} H_{5}$ ).

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