40. Which of the following oxidants will convert a primary alcohol to an aldehyde?
1) sodium dichromate /sulfuric acid 3)pyridinium chlorochromate
2) copper oxide 4) dimethylsulfoxide, oxalyl chloride
(A)3 & 4
(B)2, 3, & 4
(C) 3
(D)1, 2, 3, & 4
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