Which of the following is not an isomer of $C_{5} H_{10} O$ ?

3-Pentanone

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3-Ethoxy propane

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2-Pentanone

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Pentanal

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Solution

The correct option is B 3-Ethoxy propane
Isomers of $C_{5} H_{10} O$
(a) 3- pentanone: $C H_{3} - C H_{2} - O | | C - C H_{2} - C H_{3}$

(b) 3- Ethoxy propane: $C_{2} H_{5} O C_{3} H_{7}$

(c) 2- Pentanone: $C H_{3} - O | | C - C_{3} H_{7}$

(d) Pentanal: $C H_{3} - C H_{2} - C H_{2} - C H_{2} - O | | C - H$

(a), (b), (d) are isomers of $C_{5} H_{10} O$
$∴$ (c) is not isomer.

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