The reaction involved in the oil of winter green test is :
Salicylic acid product
The product is treated with Na2CO3 solution. The missing reagent in the above reaction is :
phenol
NaOH
ethanol
methanol
(CH3)3COCH3 and CH3OC2H5 are treated with hydroiodic acid. The fragments obtained after reactions are respectively
(CH3)3CI + CH3OH; CH3I + C2H5OH
(CH3)3CI + CH3OH; CH3OH + C2H5I
(CH3)3COH + CH3I; CH3OH + C2H5I
CH3I + (CH3)3COH; CH3I + C2H5OH
Decreasing order of reactivity in Williamson synthesis of the following :
I. Me3CCH2Br
II. CH3CH2CH2Br
III. CH2=CHCH2Cl
IV. CH3CH2CH2Cl
III > II > IV > I
I > II > IV > III
II > III > IV > I
I > III > II > IV
Arrange X, Y and Z in order of increasing acidic strengths.
X > Z > Y
Z < X < Y
X > Y > Z
Z > X > Y
The pKa of phenol is 10. Which of the following bases will deprotonate phenol completely?
NaNH2 (PKa of NH3 = 35) , (PKb of H2O = 16) , NaNH2 (pKa of N = 10) , NaOOCH3 (pKb of CH3COOH =5)
NaNH2
NH3
NaNH2 and NaOH
NH3 and NaOCOCH3
Assertion : Oxidation of 1-nitronaphthalene gives o-nitrophthalic acid whereas 1-amino naphthalene on oxidation gives phthalic acid.
Reason : An amino group attached to the benzene ring makes it resistant to oxidation whereas nitro group makes the benzene ring susceptible to oxidation.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Phenol forms 2, 4, 6-tribromophenol on treatment with Br2- water at 273 K.
Reason : Phenol is o, p- directing group.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false
The acidic strength of the given compounds follows the order
I. CH3-CH=CH-COOH
II. CH3--CH=CH-COOH
III. CH3=CH2-COOH
II > III > I
III > II > I
II > I > III
I > II > III
The reaction,
C6H5ONa + CO2 +H2O C6H5OH + NaHCO3 suggests that
phenol is a stronger acid than carbonic acid
carbonic acid is a stronger acid than phenol
water is a stronger acid than phenol
None of these.
Phenol , when it first react with cone. sulphuric acid and then with cone. nitric acid gives :
nitrobenzene
2 , 4 , 6 - trinitrobenzene
o - nitrophenol
p - nitrophenol