Topscore ochem test 1 #73

[wawis26]

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Can some please explain to me why # 2 is the right choice and not acetone.

Thanks!

H NMR spectrum of which of this compounds will show only two singlets
1)Ch3CH2OCH2CH3
2)H3CO-cyclohexane-oCH3 (para position)
3)Cyclopantane-ch3
4)Acetone
5)Cyclopropane-Ch3