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The Small Intestine

ConvertPhenol...

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ConvertPhenol to Para hydroxy phenol in one step

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p K_{a}

, of phenol is 9.2. Predict which of the following

p K_{a}

values given below is most consistent for the

p K_{a}

of para-hydroxy benzaldehyde ?

Q. Write the chromogen, chromophore and auxchrome present in para hydroxy azo benzene.

Q. In which case first has higher solubility than second?
(I) Phenol, Benzene
(II) Nitrobenzene, Phenol
(III) o-Hydroxybenzaldehyde, p-Hydroxy benzaldehyde
(IV)

C H_{3} C H O, C H_{3} - O - C H_{3}

(V) o-Nitrophenol, p-Nitrophenol

Q. Match the column I with column II and mark the appropriate choice.


(A)	Methanol	(i)	Conversion of phenol to o-hydroxy salicylic acid
(B)	Kolbe's reaction	(ii)	Ethyl alcohol
(C)	Williamson's synthesis	(iii)	Conversion of phenol to salicylaldehyde
(D)	Conversion of $1^{0}$ alcohol to aldehyde	(iv)	Wood spirit
(E)	Reimer-Tiemann reaction	(v)	Heated copper at 573 K
(F)	Fermentation	(vi)	Reaction of an alkyl halide with sodium alkoxide

Q. Assertion :A reaction between a diazo salt and an aromatic amine or a phenol, giving an amino-azo or hydroxy-azo compound is called coupling reaction. Because Reason: Condensation of diazonium with phenol is carried out in weakly acidic medium.

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