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801.

Which alcohol is most reactive towards `HCl` in the presence of anhydrous `ZnCl_(2)`?A. primaryB. secondaryC. tertiaryD. all of these

Answer» Correct Answer - C
802.

Benzene diazonium chloride on reaction with phenol in a basic medium gives:A. benzeneB. chlorobenzeneC. diphenyl etherD. p-hydroxy azobenzene

Answer» Correct Answer - D
803.

The most suitable method of separation of a mixture of ortho and para nitrophenol in the ratio `1:1` is :A. CrystallisationB. DistillationC. SublimationD. Chromatography

Answer» Correct Answer - B
804.

Assertion: Phenol is more reactive than benzene towards electrophilic reactions. Reason : The +R effect of OH group increases the electron density on benzene nucleus.A. Both A and R are correct and R is correct explanation of AB. Both A and R are correct but R is not the correct explanation of AC. A is correct but R is in correctD. A is incorrect but R is correct

Answer» Correct Answer - A
805.

Statement-1 : Para chloro phenol is more acidic than para flouro phenol. Statement-2 : negative inductive Effect if flourine is greater than in chlorineA. Statement -I is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-10B. Statement-1 is true, Statement-2 is true, Statement-2 is not a correct explanation for statement-10C. Statement-1 is true, Statement-2 is falseD. Statement-1 is false, Statement-2 is true

Answer» Correct Answer - B
806.

Which of the following statements are correct for the given alcohol? `R -OHoverset(X^(Theta))rarr R-X +overset(Theta)OH`A. Reaction will not take place because `overset(Theta)OH` is poor leaving group, `X^(Theta)` is weak bease and `overset(Theta)OH` is strong baseB. Reaction will not take place because is poor leaving group, `X^(Theta)` is strong base and `overset(Theta)OH` is weak base.C. Reaction will not take place because `overset(Theta)OH` is strong leaving group, `X^(Theta)` is strong base and `overset(Theta)OH` is weak base.D. Reaction will not take place because `overset(Theta)OH` is good leaving group, `X^(Theta)` is weak base and `overset(Theta)OH` is strong base.

Answer» Correct Answer - A
Nucleophilic substitution of alcohol is acid cataysed reaction.
807.

Which of the following reactions can be used for the preparation of `3^(@)`- buthyl methyletherA. `CH_(3)Br+(CH_(3))_(3)CO^(-)Na^(+)rarr`B. `(CH_(3))_(3)"CCl"+CH_(3)O^(-)Na^(+)rarr`C. `(CH_(3))_(3)COH +CH_(3)Cl rarr`D. `(CH_(3))_(3)"CCl"+CH_(3)Ohrarr`

Answer» Correct Answer - A
`CH_(3)Br+(CH_(3))_(3)CO^(-)Na^(+)rarrunderset("Tert-butylmethyl ether")(CH_(3)-O-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")"C "-CH_(3))`
808.

Which is the product in the following reaction? `H_(2)C=CH-underset(CH_(3))underset(|)(CH)-OHoverset(H_(2)CrO_(4))rarr`A. `H_(2)C=CH-underset(CH_(3))underset(|)(C)=O`B. `OHC-underset(CH_(3))underset(|)(C)=O`C. `HOOC-underset(CH_(3))underset(|)(C ) = O`D. `CH_(3)CHO`

Answer» Correct Answer - A
Unlike `KMnO_(4)`, which oxidises both a double bond and a hydroxy`1` group, chromic acid `(H_(2)CrO_(4))` does not oxidise double bond.
809.

`(CH_(3))_(2)CHCH(CH_(3))Ohoverset("Acid")underset(-H_(2)O)rarr X` The major product obtained in this reaction isA. `(CH_(3))_(2)CHCH=CH_(2)`B. `(CH_(3))_(2)C=CH-CH_(3)`C. `1:1` mixture of (a) and (b)D. None of the above

Answer» Correct Answer - B
Manu a time unexpected products result during dehydration of alcohols.
`CH_(3)-overset(CH_(3))overset("| ")"CH"-overset(CH_(3))overset("| ")"CH"-OHoverset("Acid")underset(-H_(2)O)rarrCH_(3)-underset("(Major)")(overset(CH_(3))overset("| ")"C "=underset(H)underset(|)C-CH_(3))+underset("(Minor)")(CH_(3)-overset(CH_(3))overset("| ")"CH"-CH=CH_(2))`
810.

`CH_(3)underset("1-butanol")((CH_(2)))_(2)CH_(2)OHoverset(NaBr,H_(2)SO_(4))rarr X`, Identify `X` and the mechansium of the reactionA. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br & S_(N)1`B. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br & S_(N)2`C. `CH_(3)-underset(Br)underset(|)(CH)-CH_(2)-CH_(3) & S_(N)1`D. `CH_(3)-underset(Br)underset(|)(CH)-CH_(2)-CH_(3) & S_(N)2`

Answer» Correct Answer - B
`CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH overset(NaBr,H_(2)SO_(4))underset(S_(N)2)rarr CH_(3)-CH_(2)-CH_(2)-CH_(2)-Br`
unbranched `1^(@)` alcoholl give `SN_(2)` reaction with `HX`.
811.

`Aoverset(Cu)underset(delta)rarrCH_(3)CH_(2)OHoverset(AI_(2)O_(3))underset(Delta)rarrB.A` and `B` respectively areA. `Alkanal, alkeneB. Alkyne,alkanalC. Alkene, alkanalD. Alkene,alkyne

Answer» Correct Answer - A
`CH_(3)CHO overset(Cu)underset(Delta)rarr CH_(3)CH_(2)OH overset(AI_(2)O_(3))underset(Delta)rarr CH_(2) = CH_(2)`
812.

The end product in the following reaction is,`PhCl overset(H_2O + CuCl_2)to A overset(conc. HNO_3)to B`A. PhOHB. PhBrC. `PhNO_2`D. picric acid

Answer» Correct Answer - D
813.

Explain : Methanol is more soluble in water than propan-l-ol.

Answer»

(1) Methanol being lower members of alcohols is more soluble in water, but as the size of an alkyl group or molecular weight of alcohol increases the solubility decreases.

(2) The solubility of methanol in water is due to polar characters of alcohols (R – O - H) and water (H – O – H).

(3) The solubility of methanol is due to the formation of intermolecular hydrogen bonding between polar molecules of methyl alcohol and water. 

Hence,

Methyl alcohol is a associated liquid.

(4) In methyl alcohol, size of methyl group being very small, -OH group constitutes major part of the molecule giving more solubility. 

As size of alkyl group increases, the non-polar character increases the solubility decreases. 

Hence,

Methanol is more soluble in water than propan-l-ol.

814.

Which of the following pair is more acidic and why?

Answer»

(a). Due to high electronegativity of sp2 - hybridized carbon, electron density on oxygen in phenol (I) decreases. 

This increases the polarity of O – H bond and results in more ionization of phenol than that of cyclohexyl alcohol (II). 

Therefore, 

phenol is more acidic than cyclohexyl alcohol.

(b). In p-nitrophenol, nitro group (NO2) is an electron-withdrawing group present at ortho position which enhances the acidic strength (-I effect). 

The O – H bond is under strain and release of proton (H+) becomes easily. 

Hence, 

o-nitrophenol is more acidic than phenol.

815.

Identify the weakest acidic compound amongst the following : (a) p-nitrophenol (b) p-chlorophenol (c) p-cresol (d) p-aminophenol

Answer»

Option : (d) p-aminophenol

816.

Compound that fails to give effervescence with NaHCO3 is :(a) C6H5COO (b) CH3COOH (c) C6H5OH (d) Picric acid

Answer»

Option : (c) C6H5OH

817.

What amount of bromine will be required to convert `2g` of phenol into `2,4,6-` tribromphenolA. 20.44gB. `6.00g`C. `4.00g`D. 10.22g

Answer» Correct Answer - D
818.

Phenol reacts with bromine in carbon disulphide at low temperature to giveA. m-bromophenolB. o-and p-bromophenolC. p-bromophenolD. 2, 4,6-tribromophenol

Answer» Correct Answer - B
819.

Phenol reacts with bromine in `CS_2` at low temperature to giveA. m-bromophenolB. p-bromophenolC. o- and p-bromophenolsD. 2, 4, 6-tribromophenol

Answer» Correct Answer - C
820.

Sodium phenoxide when heated with `CO_(2)` under pressure at 398K gives `:`A. sodium benzoateB. salolC. sodium salicylateD. salicylaldehyde

Answer» Correct Answer - C
821.

Phthalic anhydride on heating with resorcinol in the presence of conc. `H_(2)SO_(4)` gives `:`A. phenolB. fluoresceinC. phenolphthaleinD. alizarin

Answer» Correct Answer - B
822.

Catechol on heating with phthalic anhydridee in the presence of conc. `H_(2)SO_(4)` gives `:`A. phenolphthaleinB. alizarinC. fluoresceinD. phenol

Answer» Correct Answer - B
823.

Phenol reacts with bromine in carbon disulphide at low temperature to giveA. m-bromophenolB. `o^(-)` and p-bromophenolC. p-bromophenolD. 2,4,6-tribromophenol

Answer» Correct Answer - B
824.

Phenol when condensed with phthalic anhydride in the presence of conc. `H_(2)SO_(4)`, yields `,`A. methyl organgeB. phenolphthaleinC. phenol redD. salicyclic acid

Answer» Correct Answer - B
825.

Phenol when condensed with phthalic anhydride in the presence of conc. `H_(2)SO_(4)`, yields `,`A. Methyl orangeB. PhenolphthalineC. AspirinD. Methyl Blue

Answer» Correct Answer - B
826.

Which of the following alcohols gives the best yield of dialkyl ether on being heated with a trace of sulphuric acid ?A. 2- pentanolB. 2-Methly-2-butanolC. 1-PentanolD. 2-Propanol

Answer» Correct Answer - C
Primary alcohos readily form ether when heated with conc. `H_2SO_4`.
827.

In the given reaction: `CH_(3)-CH_(2)-CH_(2)-O-CH_(2)-CH_(3) overset(HCI//Delta)rarr [X] +[Y] [X]` and `[Y]` wil respectively be:A. `CH_(3)-CH_(2)-CH_(2)OH` and `CH_(3)-CH_(2)-CI`B. `CH_(3)-CH_(2)-CH_(2)-CI` and `CH_(3)-CH_(2)-OH`C. `CH_(3)-CH_(2)-CH_(2)-CI` and `CH_(2)=CH_(2)`D. `CH_(3)-CH=CH_(2)` and `CH_(2)=CH_(2)`

Answer» Correct Answer - A
`CH_(3) - CH_(2)-CH_(2)-O-CH_(2)-CH_(3)overset(HCI//Delta)rarr`
`CH_(3)-CH_(2)-CH_(2)-OH+CH_(3)-CH_(2)-CI`
828.

When `CH_(2)=CH -CO OH` is reduced with `LiAlH_(4)` the compound obtained will beA. `CH_(3)CH_(2)COOH`B. `H_(2)C=CHCH_(2)OH`C. `CH_(3)CH_(2)CH_(2)OH`D. `CH_(3)CH_(2)CHO`

Answer» Correct Answer - B
829.

P-nitrophenol is a stronger acid than phenol while p-cresol is a weaker acid. Discuss.A. `-CH_(3)` group decreases the electron density on oxygen of O-H group making p-cresol a weaker acidB. `-NO_(2)` group decreases electron density on oxygen of `O - H` group making p-nitrophenol a stronger acidC. `-CH_(3)` group increases the electron density on oxygen of `O -H` group making release of `H^(+)` easierD. `-NO_(2)` group increases the electron density on oxygen of `O - H` group making release of `H^(+)` easier .

Answer» Correct Answer - B
830.

Which of the estes shown, after reduction with `LiAlH_(4)` and aqueous workup, will yield two molecules of only a single alcohol ?A. `CH_(3)CH_(2)CO_(2)CH_(2)CH_(3)`B. `C_(6)H_(5)COCH_(2)C_(6)H_(5)`C. `C_(6)H_(5)CO_(2)CH_(2)C_(6)H_(5)`D. None of the above

Answer» Correct Answer - C
`C_(6)H_(4)overset(O)overset(||)C-OCH_(2)C_(6)H_(5)overset(LiAlH_(4))underset(H_(3)O^(+))rarr C_(6)H_(5)CH_(2)OH+C_(6)H_(5)CH_(2)OH`
831.

`+LiAlH_(4) rarr (A), (A)` is `:`A. `CH_(3)CHO`B. `CH_(3)CH_(2)OH`C. `H_(2)C=CH_(2)`D. `CH_(2)OH-CH_(2)OH`

Answer» Correct Answer - B
832.

Epoxides are `:`A. unsaturated ethersB. mixed ethersC. cyclick ethers with D. not ethers

Answer» Correct Answer - C
833.

18-crown -6 ether is able to trapA. `K^+`B. `Na^+`C. `Li^+`D. all of these

Answer» Correct Answer - A
834.

Which of the following will be obtained by keeping ether in contact with air for a long time ?A. `C_(2)H_(5)-O-CH(CH_(3))-O-OH`B. `C_(2)H_(5)-O-CH_(3)OH`C. `C_(2)H_(5)-O-C_(2)H_(5)OH`D. `CH_(3)-O-CH(CH_(3))-O-OH`

Answer» Correct Answer - A
835.

Which crown ether is used to extract cerium ?A. 15-crown-5B. 18-crown-6C. 12-crown -4D. 10- crown-3

Answer» Correct Answer - B
836.

Actully 18-crown- 6 ether means,A. 18-oxygen and 6 carbonB. 12-carbon and 6-oxygenC. 12-carbon and 12-oxygenD. 6-oxygen and 6-carbon

Answer» Correct Answer - B
837.

Crown ethers are `:`A. cyclic ethersB. ethers with several other functional groupsC. mixed ethersD. not ethers

Answer» Correct Answer - A
838.

In [18] -crown-6, the number of oxygen atoms is `:`A. 18B. 6C. 12D. 24

Answer» Correct Answer - B
839.

Ether form peroxide in contact with air and light it may cause explosion, since the boiling point light it may cause explosion, since the boiling point of peroxide is `:`A. equal to etherB. lower than etherC. higher than etherD. none of these

Answer» Correct Answer - C
840.

Select the correct statement(s) about crown ether 18-crown-6 `:`A. it is a cyclic polyetherB. it has total 18 atomsC. it has 12 carbon atimsD. it has 6 oxygen atoms

Answer» Correct Answer - A,B,C,D
841.

When diethyl ether is heated with excess of sulphuric acid, it forms `:`A. propionic acidB. acetic acidC. ethyl hyrdrogen sulphatD. ethyl alcohol

Answer» Correct Answer - C
842.

Formation of peroxide in ether can be prevented by `:`A. adding small amount of `Cu_(2)O`B. shaking with ferrous salt solutionC. distilling with conc. `H_(2)SO_(4)`D. all of the above

Answer» Correct Answer - D
843.

The ether when treated with HI produces:A. B. C. D.

Answer» Correct Answer - A,D
844.

Diethyl ether on treatment with HI in small amount, gives `:`A. `C_(2)H_(5)OH`B. `C_(2)H_(5)I`C. `C_(4)H_(10)`D. `C_(3)H_(7)I`

Answer» Correct Answer - A::B
845.

When diethyl ether is treated with chlorine in presence of sunlight, it forms `:`A. `C(2)C_(5)Cl`B. `C_(2)H_(6)`C. `CH_(3)COCl`D. `(C_(2)Cl_(5))_(2)`

Answer» Correct Answer - D
846.

Among the following sets of reactants which one produces anisole?A. `CH_(3)CHO, RMgX`B. `C_(6)H_(5)OH,` neutral `FeCl_(3)`C. `C_(6)H_(5)OH, NaOH,CH_(3)I`D. `C_(6)H_(5)CH_(3),CH_(3)COCl,AlCl_(3)`

Answer» Correct Answer - C
847.

When an ether is treated with `P_(2)S_(5)` , it gives `:`A. thioalcoholB. thioetherC. thioesterD. thioacetal

Answer» Correct Answer - B
848.

The heating of phenyl-methyl ethers with `HI` producesA. iodobenzeneB. phenolC. benzeneD. ethyl chloride

Answer» Correct Answer - B
849.

The strongest acid among the following aromatic compound isA. o-nitrophenolB. phenolC. p-nitrophenolD. m-nitrophenol

Answer» Correct Answer - B
p-nitrophenol is more acidic because pressence of electron withdrawing group at o- or p-positions increases the acidic strength.
850.

Among the following ethers, which one will product methyl alcohol on treatment with hot concentration HI ?A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C) -O-CH_(3)`B. `CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)-O-CH_(3)`C. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-O-CH_(3)`D. `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)H-O-CH_(3)`

Answer» Correct Answer - A