Question

The compound which is not isomeric with diethyl ether is:
(1) methyl n-propyl ether
(2) 1 – butanol
(3) 2 – methyl propan – 2 – ol
(4) butanone

Answer 1

Butanone is not isomeric with Diethyl Ether.

Molecular formula of Diethyl ether is C₄H₁₀O

Molecular formula of Butanone is C₄H₈O

Answer 2

Answer: (4) butanone

Explanation:

The compounds having similar molecular formula but different arrangement of atoms or groups in space are called isomers and the phenomenon is called as isomerism.  

$CH_2CH_3OCH_2CH_3$ is diethyl ether.

(1) methyl n-propyl ether : $CH_3OCH_2CH_2CH_3$

(2)  1 – butanol : $CH_3CH_2CH_2CH_2OH$

(3) 2 – methyl propan – 2 – ol :  $CH_3C(OH)(CH_3)CH_3$

(4) butanone : $CH_3CH_2COCH_3$

As molecular formula for butane is not same as that of diethyl ether, they are not isomers.