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23951.

The reaction take place by mechanism is

Answer»

`S_(N^(1))`
`S_(N^(2))`
`S_(N^(i))`
`S_(N^(AE))`

ANSWER :B
Discussion
23952.

The reaction, "SO"_(2)"Cl"_(2)overset(k_(1))to"SO"_(2)+"Cl"_(2), is a first order reaction with k_(1)=2.2xx10^(-5)"sec"^(-1) at 575 K. What percentage of "SO"_(2)"Cl"_(2) will get decomposed in 90 minutes when the reaction is carried out at 575 K ?

Answer»

Solution :Since the REACTION is of the FIRST order (given), `k=(2.303)/(t)LOG""(a)/(a-x)`
Here, we are given that `k=2.2xx10^(-5)"SEC"^(-1)"",""t=90" MINUTES "=90xx60=5400" sec".`
`:.2.2xx10^(-5)s^(-1)=(2.303)/(5400s)log""(a)/(a-x)" or "log""(a)/(a-x)=0.0516" or "(a)/(a-x)="antilog "(0.0516)=1.127.`
or `""a=1.127a-1.127x" or "0.127a=1.127x`
`:.""(x)/(a)=(0.127)/(1.127)=0.113" or "%" decomposed "=0.113xx100=11.3%.`
Discussion
23953.

The reaction SO_(2)Cl_(2) to SO_(2)+Cl_(2) is a first order reaction with half-life 3.15xx10^(4)s at 320^(@)C. What percentage of SO_(2)Cl_(2) would be decomposed on heating at 320^(@)C for 90 minutes?

Answer»

Solution :From half-life data, we can OBTAIN the value of k
`t_(1//2)=(0.693)/(k) or k= (0.693)/(3.15xx10^(4)s)`
Applying first order equation and substituting the values, we GET
`k=(2.303)/(t)"log"([A]_(0))/([A])`
or `(0.693)/(3.15xx10^(4)s)=(2.303)/(90xx60s)"log"(100)/([A])`
or `"log"(100)/([A])=(0.693 XX 90 xx 60)/(2.303xx3.15xx10^(4))=(0.301xx5400)/(3.15xx10^(4))=(16.254)/(315)=0.0516`
or `(100)/([A])="Antilog "0.0516=1.126`
or `[A]=(100)/(1.126=88.8%`
PERCENTAGE of `SO_(2)Cl_(2)` decomposed `=100-88.8=11.2%`.
Discussion
23954.

The reaction sodium amalgam and water with fructose confirms the presence of ………. .

Answer»

SOLUTION :KETO GROUP
Discussion
23955.

The reaction sequence given below gives product R. The structure of the product R is

Answer»




SOLUTION :The GIVEN REACTION is Hunsdiecker reaction.
Discussion
23956.

The reaction sequence C_(6)H_(5)-CH=CH-Choverset([X])rarr C_(6)H_(5)-CH_(2)-CH_(2)-CH_(2)OH [X] will be

Answer»

`LiAlH_(4)`
`NaBH_(4)`
ALUMINIUM ISOPROPOXIDE
All of these

Answer :A
Discussion
23957.

The reaction S_(2)O_(8)^(2-) + 3I^(-) rarr 2SO_(4)^(2-) + I_(3)^(-) is of first order both with respect to the persulphate and iodide ions. Taking the initial concentration as 'a' and 'b' respectively and taking x as the concentration of the trioxide at time t a differential rate equation can be written. Two suggested mechanisms for the reaction are: (I) S_(2)O_(8)^(2-)+I^(-) rarr SO_(4)I^(-)+SO_(4)^(2-)(fast) I^(-)+SO_(4)I^(-) overset(k_(1)) rarr I_(2) + SO_(4)^(2-)(slow) I^(-)+I_(2) overset (k_(2)) rarr I_(3)^(-)(fast) (II) S_(2)O_(8)^(2-)+I^(-) overset(k_(1)) rarr S_(2) O_(8) I^(3-)(slow) S_(2)O_(8)I^(3-) overset(k_(2)) rarr 2SO_(4)^(2-) +I^(+)(fast) I^(+)+I^(-) overset (k_(3)) rarr I_(2)(fast) I_(2)+I^(-) overset(k_(4)) rarr I_(3)^(-)(fast) For the reaction I_(2)+2S_(2)O_(3)^(2-) rarr S_(4)O_(6)^(2-)+ 2I^(-) (P) -(d[I_(2)])/(dt)=-1/2(d[S_(2)O_(3)^(2-)])/(dt) (Q) -(d[I_(2)])/(dt)=-2(d[S_(2)O_(3)^(2-)])/(dt) (R) (d[I^(-)])/(dt)=-2(d[I_(2)])/(dt)xx(d[S_(2)O_(3)^(2-)])/(dt) (S)(d[S_(4)O_(6)^(2-)])/(dt)=1/2(d[I^(-)])/(dt)

Answer»

<P>only (P)
(P) and (S)
(Q) and (S)
only (R)

ANSWER :B
Discussion
23958.

The reaction S_(2)O_(8)^(2-) + 3I^(-) rarr 2SO_(4)^(2-) + I_(3)^(-) is of first order both with respect to the persulphate and iodide ions. Taking the initial concentration as 'a' and 'b' respectively and taking x as the concentration of the trioxide at time t a differential rate equation can be written. Two suggested mechanisms for the reaction are: (I) S_(2)O_(8)^(2-)+I^(-) rarr SO_(4)I^(-)+SO_(4)^(2-)(fast) I^(-)+SO_(4)I^(-) overset(k_(1)) rarr I_(2) + SO_(4)^(2-)(slow) I^(-)+I_(2) overset (k_(2)) rarr I_(3)^(-)(fast) (II) S_(2)O_(8)^(2-)+I^(-) overset(k_(1)) rarr S_(2) O_(8) I^(3-)(slow) S_(2)O_(8)I^(3-) overset(k_(2)) rarr 2SO_(4)^(2-) +I^(+)(fast) I^(+)+I^(-) overset (k_(3)) rarr I_(2)(fast) I_(2)+I^(-) overset(k_(4)) rarr I_(3)^(-)(fast) Which mechanism is consistent with the facts given about the reaction rate equation?

Answer»

MECHANISM(I)
Mechanism(II)
Both (I) and (II)
NEITHER (I) nor (II)

ANSWER :B
Discussion
23959.

The reactionSb_2 S_3(s) + 3H_2(g) iff 2Sb(s) + 3H_2S(g)was studied by analysing the equilibriuin mixture for the amount of H S produced. A vessel whose volume was 2.5 litre was filled with 0.01 mole of Sb_2S_3and 0.01 mole of H_2S . After the mixture came to equilibriuin in the closed vessel at 440^@C , the gaseous mixture was removed and the H_2S was dissolved in water, Sufficient Pb^(2+)ions were added to react completely with the H_2Sto precipitate PbS. If 1.029 g of PbS was obtained, what is the value of K_cat 440^@C?

Answer»


ANSWER :0.43
Discussion
23960.

The reaction S_(2)O_(8)^(2-) + 3I^(-) rarr 2SO_(4)^(2-) + I_(3)^(-) is of first order both with respect to the persulphate and iodide ions. Taking the initial concentration as 'a' and 'b' respectively and taking x as the concentration of the trioxide at time t a differential rate equation can be written. Two suggested mechanisms for the reaction are: (I) S_(2)O_(8)^(2-)+I^(-) rarr SO_(4)I^(-)+SO_(4)^(2-)(fast) I^(-)+SO_(4)I^(-) overset(k_(1)) rarr I_(2) + SO_(4)^(2-)(slow) I^(-)+I_(2) overset (k_(2)) rarr I_(3)^(-)(fast) (II) S_(2)O_(8)^(2-)+I^(-) overset(k_(1)) rarr S_(2) O_(8) I^(3-)(slow) S_(2)O_(8)I^(3-) overset(k_(2)) rarr 2SO_(4)^(2-) +I^(+)(fast) I^(+)+I^(-) overset (k_(3)) rarr I_(2)(fast) I_(2)+I^(-) overset(k_(4)) rarr I_(3)^(-)(fast) How could the progress of this reaction be best monitored?

Answer»

By monitoring the colour of the REACTION mixture
By TITRATION of `I_(3)^(-)` with hypo
By precipitation of `I^(-)` with `Ag^(+)`
By monitoring the change in pressure.

Answer :B
Discussion
23961.

The reaction S_(2)O_(8)^(2-) + 3I^(-) rarr 2SO_(4)^(2-) + I_(3)^(-) is of first order both with respect to the persulphate and iodide ions. Taking the initial concentration as 'a' and 'b' respectively and taking x as the concentration of the trioxide at time t a differential rate equation can be written. Two suggested mechanisms for the reaction are: (I) S_(2)O_(8)^(2-)+I^(-) rarr SO_(4)I^(-)+SO_(4)^(2-)(fast) I^(-)+SO_(4)I^(-) overset(k_(1)) rarr I_(2) + SO_(4)^(2-)(slow) I^(-)+I_(2) overset (k_(2)) rarr I_(3)^(-)(fast) (II) S_(2)O_(8)^(2-)+I^(-) overset(k_(1)) rarr S_(2) O_(8) I^(3-)(slow) S_(2)O_(8)I^(3-) overset(k_(2)) rarr 2SO_(4)^(2-) +I^(+)(fast) I^(+)+I^(-) overset (k_(3)) rarr I_(2)(fast) I_(2)+I^(-) overset(k_(4)) rarr I_(3)^(-)(fast) The general differential equation for the above reaction is:

Answer»

`(DX)/(DT) =K[a-x][b-3x]`
`(dx)/(dt)=-k[a-x][b-3x](k GT 0)`
`(dx)/(dt)=k[a-x][b-x](k gt 0)`
`(dx)/(dt)=-k[a-x][b-x](k gt 0)`

Answer :A
Discussion
23962.

The reaction, RX + R-ONa to R-O-R + NaX is called

Answer»

WURTZ REACTION
WILLIAMSON's synthesis
Kolbe's reaction
Hofmann bromamide reaction

Answer :B
Discussion
23963.

The reaction (s) which does (da) occur in the blast furnace in the extraction of iron from hacmatite are is (are)

Answer»

`Fe_(2)O_(3)+CO to 2FeO+CO_(2)`
`FeO+CO to Fe+ CO_(2)`
`Fe_(2)O_(3)+3C to 2FE+3CO`
`CaO+SiO_(2) to CaSiO_(3)`

Solution :Reactions OCCURING in blast furnace are
`3Fe_(2)O_(3)+CO OVERSET(300-400^(@)C) to 2Fe_(3)O_(4)+CO_(2)`
`Fe_(2)O_(4)+CO overset(500-600^(@)C) to 3FeO+CO_(2)`
`FeO+CO overset(700^(@)C toFe+CO_(2)`
Slage is also formed in blast furnace.
`SiO_(2)+CaO to CaSiO_(3)` (slag)
Discussion
23964.

The reaction RX+Nu^(-)toRNu+X^(-) is an example of

Answer»

NUCLEOPHILIC SUBSTITUTION
electrophilic substitution
Nucleophilic addition
Electrophilic addition

Answer :A
Discussion
23965.

The reaction ,ROH+H_2CN_2 in the presence of HBF_4 gives the following roduct :

Answer»

`ROCH_3`
`RCH_2OH`
`ROHCN_2N_2`
`RCH_2CH_3`

SOLUTION :NA
Discussion
23966.

R-X+2Na+X-Roverset("Dry other")underset(Delta)toR-R+2NaX.If R is aryl group , what is thename of the reaction.

Answer»

Kolbe's REACTION
WURTZ reaction
Friedel Crafts reaction
GRIGNARD reaction

Answer :B
Discussion
23967.

The reaction represents

Answer»

nucleophilic substitution
electrophilic addition
electrophilic substitution
elimination REACTION

ANSWER :B
Discussion
23968.

The reaction ,RCOOH overset(C_2H_5OH+Na)rarrRCH_2OH is called:

Answer»

Corey HOUSE reaction
Bonveault-Blanc reaction
Clemmensen reduction
None

Answer :B
Discussion
23969.

The reaction,RCl + NaI overset(" Dry acetone")to R - I + NaCl is known as

Answer»

WURTZ REACTION
FITTING reaction
Wurtz-Fitting reaction
FINKELSTEIN's reaction .

ANSWER :D
Discussion
23970.

The reaction , RCH_(2)CH_(2)COOHunderset(Br_(2))overset("Red P")toRCH_(2)underset(Br)underset(|)(CHCOOH)is called :

Answer»

REIMER Tiemann REACTION
HELL Volhard ZELINSKY reaction
Cannizzaro 's reaction
Sandmeyer 's reaction.

Answer :B
Discussion
23971.

The reaction RCH_(2)CH_(2)COOHoverset(Red P + Br_2) toR - CH_(2) - CH(Br) -COOH

Answer»

Reimer- Tiemann REACTION
Hell-Volhard - Zelinsky reaction
CANNIZZARO reaction
Sandmeyer reaction .

Answer :B
Discussion
23972.

The reaction RCH_(2)CH_(2)COOH overset(Red P)underset(Br_(2))toRCH_(2)-underset(Br)underset(|)(C)HCOOH is called as

Answer»

CANNIZZARO REACTION
Hell Volhared ZELINSKY reaction
Reimer Teimann reaction
Sandmeyer reaction

ANSWER :B
Discussion
23973.

The reaction rate the does not decrease with time is

Answer»

pseudo first ORDER reaction
first order reaction
zero order reaction
SECOND order reaction

Answer :C
Discussion
23974.

The reactionRC-=CR overset("Lindlar catalyst")underset (H_2) (rarr)

Answer»

CIS alkene
Trans alkene
Allkane
None of these

Answer :C
Discussion
23975.

The reaction rate at a given temperature is slower when :

Answer»

The ENERGY of ACTIVATION is higher
The energy of activation is lower
Entropy changes
Initial CONCENTRATION of the REACTION REMAINS constant

Answer :A
Discussion
23976.

The reaction R_(2)C=NNH_(2)overset(C_(2)H_(5)Ona)rarrR_(2)CH_(2)+N_(2) is called

Answer»

CLEMMENSEN REDUCTION
Hunsdiecker REACTION
Tischenko reaction
Wolff-Kishner reduction.

SOLUTION :
This is Wolff-kishner Reduction.
Discussion
23977.

The reaction rate at a given temperature becomes slower then

Answer»

The FREE energy of activation is HIGHER
The free energy of activation is lower
The entropy CHANGES
The initial concentration of the reactants remains CONSTANT

Solution :Slowest reaction rate indicates higher energy of activation .
Discussion
23978.

The reaction rate at a given temperature becomes slower,then ……

Answer»

the free ENERGY of activation is higher
the free energy of activation is lower
the ENTROPY changes.
the INITIAL CONCENTRATION of the REACTANTS remains constant.

Answer :A
Discussion
23979.

The reaction R_(2)C="NNH"_(2)overset(C_(2)H_(5)ONa)rarrR_(2)CH_(2)+N_(2) is called

Answer»

CLEMMENSEN reduction
Hundicker reaction
Fischenko reaction
Wolff Kishner reducion.

Solution :DUE to the PRESENCE of `alpha` HYDROGEN in 2-Methyl PROPIONALDEHYDE
Discussion
23980.

The reaction R - C -=N underset(H_(3)O^(+))overset(SnCl_(2)+HCl)to R - CHO + NH_(3)

Answer»

ROSENMUND's reduction
STEPHEN's reduction
Clemmenson's reduction
CANNIZZARO's reaction

ANSWER :B
Discussion
23981.

The reaction R-Cl+KIoverset("Acetone")rarrRI+KCl is known as :

Answer»

Hunsdiecker reaction
Finkelstein reaction
WURTZ Fitting reaction
Ulmann reaction

ANSWER :B
Discussion
23982.

The reaction quotient, Q is expresse as some as, that for equilibrium constant K.The value of Q for the given composition of a reaction mixture helps us to know whether the reaction will move forward or backward or remain in equlibrium. It helphs to pedict the effect of pressure on the direction of the gaseous reaction. In some reactions, addition of inert gas also favours either the formation of reactansts or products. The value of equlibrium constant of a reaction changes with change of temperture and the change is gives by van't Hoff equation, d ln K_(p)//dT=DeltaH^(@)//RT^(2) where enthalpy change, DeltaH^(@), is taken as constant in the small temperatue range. For the above reaction in equlibrium, helium gas was added but the mixture was allowed to expand to keep the pressure constant. Then

Answer»

More of ammonia will be formed
Ammonia will dissociate back into `N_(2)and H_(2)`
There will be no effect on EQULIBRIUM
Equlibrium constant of the reaction will change

SOLUTION :As volume in increased, concentration will decrease. To KEEP `K_(c)` constant, `[NH_(3)]` shouyld decrease more.
Discussion
23983.

The reaction quotient, Q is expresse as some as, that for equilibrium constant K.The value of Q for the given composition of a reaction mixture helps us to know whether the reaction will move forward or backward or remain in equlibrium. It helphs to pedict the effect of pressure on the direction of the gaseous reaction. In some reactions, addition of inert gas also favours either the formation of reactansts or products. The value of equlibrium constant of a reaction changes with change of temperture and the change is gives by van't Hoff equation, d ln K_(p)//dT=DeltaH^(@)//RT^(2) where enthalpy change, DeltaH^(@), is taken as constant in the small temperatue range. Which of the following will be correct

Answer»

Plot of LN `K_(p)` VERSUS `1//T^(2)` will be linear with +ve slope
Plot of ln `K_(p)` versus `1//T`will be linear with +ve slope
Plot of ln `K_(p)` versus `1//T^(2)` will be linear with-ve slope
Plot of ln `K_(p)` versus `1//T` will be linear with -ve slope

SOLUTION :`(d lnK_(p))/(dT)=(DeltaH^(@))/(RT^(2))"GIVEN ln"K_(p)=(DeltaH^(@))/(RT)."Hence, polt of " ln K_(p)vs1//T` will be linear with slope `=-DeltaH^(@)//R.`
Discussion
23984.

The reaction quotient (Q) for the reaction N_(2(g))+3H_(2(g))iff2NH_(3(g)) is given by Q=([NH_(3)]^(2))/([N_(2)][H_(2)]^(3)) The reaction will proceed from right to left if

Answer»

`Q=K_(c)`
`QltK_(c)`
`QgtK_(c)`
`Q=0`

Solution :The reaction PROCEEDS from right to left when `QgtK_(c)`, so that Q tends to decrease to BECOME EQUAL to `K_(c)`.
Discussion
23985.

The reaction quotient (Q) for the reaction N_(2(g))+3H_(2(g))hArr2NH_(3(g)) is given by Q=([NH_(3)]^(2))/([N_(2)][H_(2)]^(3)). The reaction will proceed from right to left is

Answer»

`Q=0`
`Q=K_(C)`
`QltK_(c)`
`QgtK_(c)`

SOLUTION :If `QgtK_(c)` reaction will proceed right to left to decrease CONCENTRATION of product.
Discussion
23986.

The reaction products of the reaction between C_6H_5NH_2 ,CHCl_3 and KOH are :

Answer»

`C_6H_5NC+KCL`
`C_6H_5OH+NH_4Cl +H_2O`
`C_6H_5Cl +NH_4Cl+KCL`
`C_6H_5CN+KCl`

ANSWER :A
Discussion
23987.

The reaction products of

Answer»

`C_(6)H_(5)OH+ CH_(3)I`
`C_(6)H_(5)I+CH_(3)OH`
`C_(6)H_(5)CH_(3)+HOI`
`C_(6)H_(6)+CH_(3)OI`

Answer :A
Discussion
23988.

The compound with zero dipole moment is

Answer»

Methanal
Ethanal
Propanal
Methyl ethanoate

Answer :A
Discussion
23989.

Which compound on reaction with ethyl magnesium bromide and water will from 2- methyl-2 butanol:

Answer»

Methanal
Ethanal
Propanal
Methyl ethanoate

Answer :A
Discussion
23990.

The reaction product of the compound ‘A’ with excess of methyl magnesium iodide followed by acidic hydrolysis yields tertiary butanol. The compound could be

Answer»

methanol
ethanol
PROPANAL
METHYL ethanoate

ANSWER :D
Discussion
23991.

The reaction product of C_(6)H_(5)OCH_(3)+Hioverset(/_\)rarr…. Is :

Answer»

`C_(6)H_(5)OH+CH_(3)I`
`C_(6)H_(5)I+CH_(3)OH`
`C_(6)H_(5)CH_(3)+HOI`
`C_(6)H_(6)+CH_(3)OH`

Solution :N//A
Discussion
23992.

The reaction Ph-OH + dilute HNO_3 to? Gives predominately

Answer»

2-nitrocarbolicacid
4-nitrocarbolicacid
2,4,6- trinitrocarbolic acid
3-nitro CARBOLIC acid

Answer :A
Discussion
23993.

The reaction P_(4)+3NaOH+3H_(2)Oto3NaH_(2)PO_(2)+PH_(3) is an example of

Answer»

DISPROPORTIONATION reaction
Neutralisation reaction
Double DECOMPOSITION reaction
Pyrolytic reaction

Answer :A
Discussion
23994.

The reaction overset(+ )(ArN_2 Cl^(-) overset(Cu// HCl )to ArCl +N_2 +CuCl is named as

Answer»

Sandmeyer REACTION
Gatterman reaction
Claisen reaction
Carbylamine reaction

Solution :`ArN_(2)^(+) CL^(-)OVERSET(CU // HCl ) toArCl+N_2+Cu Cl `. It is Gatterman reaction.
Discussion
23995.

The reaction of zinc with dilute and concentrated nitric acid respectively produces :

Answer»

`NO_(2)` and `N_(2)O`
`N_(2)O` and `NO_(2)`
`NO_(2)` and NO
NO and `N_(2)O`

Solution :`4Zn + underset("dilute")(10HNO_(3)) to 4Zn(NO_(3))_(2) + N_(2)O + 5H_(2)O`
`Zn + underset("CONC")(4HNO_(3)) to Zn(NO_(3))_(2) + 2NO_(2) + 2H_(2)O`
Discussion
23996.

The reaction of zinc with dilute and concentrated nitric acid, respectively, produce

Answer»

`NO_(2) and N_(2)O`
`N_(2)O and NO_(2)`
`NO_(2) and NO`
`NO and N_(2)O`

ANSWER :B
Discussion
23997.

The reaction of zinc with dilute and concentrated nitric acid, respectively produces -

Answer»

`NO_2 and N_2O`
`N_2O and NO_2`
`NO_2 and NO`
`NO and N_2O`

ANSWER :B
Discussion
23998.

The reaction of white phosphorus with aqueous NaOH gives phosphine along with another compound. The reaction type , the oxidation states of phosphorus in phosphine and the other product are respectively

Answer»

redox reaction , -3 and -5
redox reaction , +3 and +5
disproportionation reaction , -3 and -5
disproportionation reaction , -3 and +1

SOLUTION :`overset(0)(P_(4))+3NaOH + 3H_(2)O RARR 3NaH_(2) overset(+1)(PO_(2))+overset(-3)(PH_(3))`
It is a disproportionation reaction. In this reaction, oxidation state of P increases from 0 in `P_(4)` to +1 in `NaH_(2)PO_(2)` and decreases from 0 in `P_(4)` to -3 in `PH_(3)`.
Discussion
23999.

The reaction of white phosphorus with aqueous NaOH gives phosphine along with another phosphorus containing compound. The reaction type , the oxidation states of phosphorus in phosphine and the other product are respectively

Answer»

REDOX REACTION , –3 and –5
redox reaction , +3 and +5
disproportionation reaction , –3 and +1
disproportionation reaction , –3 and +3

Answer :C
Discussion
24000.

The reaction of which halogens with water is endothermic

Answer»

`F_(2)`<BR>`Cl_(2)`
`Br_(2)`
`I_(2)`

SOLUTION :`DeltaG=Ve`, non-spontaneous
Discussion