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Which of the following alcohols will not...

Which of the following alcohols will not be easily oxidised by `K_2Cr_2O_7` in dil. `H_2SO_4` ?

A

` CH_3 OH`

B

` CH_3 CH_2 OH`

C

` (CH_3)_3 COH`

D

` CH_3 CHOHCH_3`

Text Solution

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The correct Answer is:
C
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K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. Which of the following statements is wrong when a mixture of NaCI and K_2Cr_2O_2 is gently walmed with conc. H_2SO_4 ?

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AAKASH SERIES-APPENDICES -REVISION EXERCISE -ALCOHOLS
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  8. Tetiary butyl alcohol heated with conc. H2SO4 and the alkene thus fo...

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  9. R-CH2 -CH2 OH can be converted into RCH2 CH2 COOH. The correct sequenc...

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  12. How many promary structural alcohols isomers are possible for C5H(11)...

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  14. For which of the following parameters, the structural isomers C2H5OH a...

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  18. Among the following the one that gives positive iodoform test upon rea...

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  19. CH3CH2OH overset(P+I1)(to) A overset(Mg)(to) B overset(HCHO)(to) C ove...

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  20. Acid catalysed hydration of alkenes is

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