66. A compound exhibits an infrared band at 2245 cm-1 and is hydrolysed by mineral acid to give an organic acid. The original compound is: (A) an ester (B) an amide (C) a nitrile (D) an acid anhydride (E) an alkyne

67. Compound X has an empirical formula CH2 and a molecular weight of 84. When X is subjected to ozonolysis two organic products are obtained; only one of these reduces Fehling's solution and both give positive iodoform reactions. X is: (A) hex-1-ene (B) hex-2-ene (C) hexa-1,4-diene (D) 3-methylpent-2-ene (E) 2,3-dimethylbut-2-ene

66. A compound exhibits an infrared band at 2245 cm^-1 and is hydrolysed by mineral acid to give an organic acid. The original compound is:
(A) an ester
(B) an amide
(C) a nitrile
(D) an acid anhydride
(E) an alkyne

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