Which represents Reimer-Tiemann reraction ?(1)(2)(3)(4)
When phenol is treated with excess bromine water, it gives:
m-bromophenol
o- and p-bromophenol
2,4-dibromophenol
2,4,6-tribromophenol
In the reaction, Phenol →DIstillationZn(A) →Conc. HNO3 at 60°CConc. H2SO4(B) →NaOH(aq)Zn(C)
The compounds (A),(B) and (C) are of the following:
benzene, nitrobenzene and aniline
benzene, dinitrobenzene and m-nitroaniline
toluene, m-nitrobenzene and m-toluidine
benzene, nitrobenzene and hydrazobenzene
Phenol on oxidation gives chloranil. The oxidant used is:
K2S2O8
KMnO4
KCIO3 + HCl
none of these
A characteristic group test for phenolic gp. is:
Liebermann's nitroso reaction
coupling with diazonium salt
aqueous FeCl3
all of the above
Phenol can be converted into salicylic acid by
2. Kolbe's reaction
Etard's reaction
4. both (2) and (3)
Phenol with CCl4 in basic medium
Resorcinol and conc. H2SO4 in presence of phthalic anhydride produce a compound which is:
a dye
an antiseptic
an indicator
a detergent
Phenol is weakly acidic but does not react with NaHCO3 like carboxylic acids hence:-
phenol is weaker than carbonic acid
phenol is stronger than carbonic acid
phenol is stronger than carboxylic acid
none of the above
An organic compound C7H8O is neither soluble in NaOH nor gives blue colour with FeCl3, is:
C6H5.CH2OH
C6H4<OHCH3
C6H5.OCH3
The electrophile involved in the above reaction is:
Which of the following reagents may be used to distinguish between phenol and benzoic acid?
Aqueous NaOH
Tollens reagent
Molisch reagent
Neutral FeCl3
In the given transformation, which of the following is the most appropriate reagent ?
Zn-Hg/HCl
Na, Liq. NH3
NaBH4
NH2NH2,OH
An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts the fastest and by what mechanism:
secondary alcohol by SN2
tertiary alcohol by SN2
secondary alcohol by SN1
tertiary alcohol by SN1
Sodium phenoxide when heated with CO2 under pressure at 125°C yields a product which on acetylation produces C.
The major product C would be :
A compound with molecular formula C4H10O3 is converted by the action of acetyl chloride to a compound with molar mass 190. The original compound has:
one OH group
two OH groups
three OH groups
no OH group
Phenyl ethyl ether with concentrated hydrobromic acid on boiling yields:-
Phenol and ethyl bromide
Bromobenzene and ethanol
Phenol and ethane
Bromobenzene and ethane
The compound that does not react with sodium is-
CH3CHOHCH3
CH3 —O—CH3
CH3COOH
C2H5OH
An organic compound A reacts with sodium metal and forms B. On heating with conc. H2SO4, A gives diethyl ether. So A and B are -
Phenol on treatment with dil. HNO3 at room temperature gives-
1.
2.
3.
4. All of the above
Identify A and predict the type of reactions
2. and elimination addition reaction3. and cine substitution reaction
4. and cine substitution reaction
Identify A, X, Y and Z
A-methoxymethane, X-ethanoic acid, Y-acetate ion, Z-hydrazine
A- methoxymethane, X-ethanol, Y-ethanoic acid, Z- semicarbazide
A-Acetaldehyde, X-ethanol, Y-but-2-en-1-ol, Z- semicarbazone
A-ethanol, X-acetaldehyde, Y-butanone, Z-hydrazone
Which one is the most acidic compound ?
The reaction
can be classified as
Alcohol formation reaction
Dehydration reaction
Williamson alcohol synthesis reaction
Williamson ether synthesis reaction
Reaction of phenol with chloroform in the presence of dilute sodium hydroxide finally
introduces, which one of the following functional group?
-CH2Cl
-COOH
-CHCl2
-CHO
Which of the following is not the product of dehydration of
Among the following ethers, the one that will produce methyl alcohol on treatment with hot concentrated HI is-
H2COH.CH2OH on heating with periodic acid gives :-
2HCOOH
CHO-CHO
Acetophenone when reacted with a base, C2H5ONa, yields a stable compound which has the structure
The reaction:
CH3-CH|CH3-CH2-O-CH2-CH3 + HI →heated?
Which of the following compounds will be formed?
CH3-C|CH3H-CH2-I+CH3CH2OH
CH3-C|CH3H-CH3+CH3CH2OH
CH3-C|CH3H-CH2OH+CH3CH3
CH3-C|CH3H-CH2OH+CH3-CH2-I
The major organic product in the reaction, CH3 — O — CH(CH3)2 + HI → Product is :
CH3OH+(CH3)2CHI
ICH3OCH(CH3)2
CH3O CI(CH3)2
CH3I+(CH3)2CHOH
Please disable the adBlock and continue. Thank you.