21. The proton NMR spectrum of an unknown compound contains a triplet at 9.8 ppm. Which of the following could be this unknown? (A) (CH3)3CCHO (B)CH3CH2CH2CO2H (C) CH3CH2CH2CHO (D) CH3CO CH2Ph (E) PhCHO

27. To a solution of propyne in diethyl ether, one molar equivalent of CH3Li was added and the resulting mixture was stirred for 0.5 hour. After this time5 an excess of D20 was added. Describe the major organic product(s) of this reaction. h (A) CH3CCD + CH4 (B) CH3CCCH3 (C) CD3CCD3 (D) CH3CCCD3 (E) CH3CCD + CH3D

21. The proton NMR spectrum of an unknown compound contains a triplet at 9.8 ppm. Which of the following could be this unknown?
(A) (CH₃)₃CCHO
(B)CH₃CH₂CH₂CO₂H
(C) CH₃CH₂CH₂CHO
(D) CH₃CO CH₂Ph
(E) PhCHO

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