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How the following transfrormations can b...

How the following transfrormations can be brought about ? Name only the reagents .
a) Cyclohexanol to cyclohexanone
b) Allyl alcohol to propenal
c) p - Fluorotoluene of pfluorobenzaldehyde

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(a) Potassium dichromate in acidic medium
(b) `C_(5)H_(5)overset(+)(N)HCrO_(3)Cl^(-)` (Pyridinium chlorochromate)

(c) `CrO_(3)` in the presence of acetic anhydride
(i) `CrO_(2)Cl_(2)` (ii) `H_(2)O`
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Give name of the reagents to bring about the Cyclohexanol to cyclohexanone.

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