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15951.

Type of elimination reaction in which least substituted alkene is major product known as Hofmann's elimination. Such reaction occur in following conditions : (X) when base is bulky (Y) when leaving group is very poor such as fluoride, ammonium group (-overset(oplus)NR_(3)) etc. (Z) when alkyl halide contain one or more double bonds.

Answer»




SOLUTION :N//A
Discussion
15952.

Which of the following is not true for structure of SO_2?

Answer»

It is a RESONANCE hybrid of three resonating structures
One `pi`-BOND ARISES from `ppi-ppi` overlapping
Other `pi-` bond arisses from `p_(pi)-d_(pi` overlapping
It is a resonance hybrid of TWO resonating strucuture.

Answer :A
Discussion
15953.

Why boiling points of alkyl cyanides are higher than those of the corresponding isocyanides?

Answer»

SOLUTION :CYANIDES are more POLAR than ISOCYANIDES.
Discussion
15954.

Which of the following is more basic hydroxide ?

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`Sm (OH)_(3)`
`Yb(OH)_(3)`
`Ho(OH)_(3)`
`Ho_(OH)_(3)`

Solution :ACCORDING to FAJAN's rule larger the size of the cation, GRATER is the tendency of its hydroxides to dissociate and stronger will be the base. All lanthanides FORM hydroxide of formula `Ln(OH)_(3)` and oxides. Which are ionic and basic in NATURE. From `La^(3+) ` to `Lu^(3+)` ionic size decreases, as a result, their covalent character between `Ln^(3+)`ion and `OH^(-)` ion increases, Therefore `La(OH)_(3)` is more basic and more ionic than `Lu(OH)_(3).`
Basicity and ionic character of hydroxide decrease in the order.
`La(OH)_(3)gt Ce (OH)_(3)gt ......gt Lu(OH)_(3)`
Discussion
15955.

Which differs from the rest :

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Glucose
Maltose
SUCROSE
LACTOSE

ANSWER :A
Discussion
15956.

Which of the following has largest bond dissociation energy?

Answer»

`HF`
`HCL`
`HI`
`HBR.`

ANSWER :A
Discussion
15957.

XeOF_2, contains

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Six electron pairs FORMING an octahedron with two positions occupied by lone pairs
It have one pi BOND 3 sigma bond and 2 lone PAIR on centeralatom
Three pi-bonds and the remaining four electron pairs forming a tetrahedron
One T-bond and the remaining six electron pairs forming an octahedron with one position occupied by a lone pair

Answer :D
Discussion
15958.

What is the name and structure of the monomer of natural rubber ?

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SOLUTION :ISOPRENE, i.e., 2-methylbuta-1,3-diene,`CH_(2)=C(CH_(3))CH=CH_(2)`.
Discussion
15959.

Write short note : Polytetrafluoroethene (Teflon).

Answer»

Solution :Preparation : Teflon is manufactured by heating tetrafluoroethene with a free radical or persulphate catalyst at high pressures.
`underset("fluoroethene")underset("Tetra")(nCF_(2)=CF_(2))overset("Catalyst")underset("High pressure")RARR underset("Teflon")([--CF_(2)-CF_(2)--]_(n))`
Properties : It is chemically inert.
It is resistant to ATTACK by corrosive reagents.
Uses : It is used in making oil seals and gaskets and also used for non-stick SURFACE COATED utensils.
Discussion
15960.

Which of the following gases adsorb more

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`N_(2)`
`H_(2)`
`O_(2)`
`CO_(2)`

ANSWER :D
Discussion
15961.

Write the product formed when p-nitrochlorobenzene is heated with aqueous NaOH at 443 K followed by acidification.

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SOLUTION :
Discussion
15962.

Write the products of the following reaction : 6XeF_(4)+12H_(2)O to Is this reaction a disproportionation reaction ? Give reasons in support of your answer.

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Solution :`6XeF_(4)+12H_(2)O to 4Xe+2XeO_(3)+24HF+3O_(2)`
This is a DISPROPROTIONATION reaction.
Oxidation number of Xe in `XeF_(4)=4`
Oxidation number of Xe as element = 0
Oxidation number of Xe in `XeO_(3)=6`
Thus it decomposes into TWO COMPOUNDS where one compound has GREATER oxidation number and the second compound has smaller oxidation number than the original.
Discussion
15963.

Wrong statement about HNO_3 is:

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The PROTEINS are CONVERTED into xanthoproteins
`HNO_3` ACTS as a DEHYDRATING agent
It exists in two canonical forms
`HNO_3` acts as an OXIDISING agent

Answer :B
Discussion
15964.

What are metallic carbonyl ? Give example.

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Solution :Metal CARBONYL are the transition metal COMPLEXES of carbon monoxide, containing metal carbon bond.
In these complexes `CO` molecule act as a NEUTRAL ligand.
e.g, `[Ni(CO)_(4)]` NICKEL tetra carbonyl, a homoleptic complex.
Discussion
15965.

Which of the statements is not true

Answer»

On passing `H_(2)S` through acidified `K_(2)Cr_(2)O_(7)` solution, a milky colour is observed
`Na_(2)Cr_(2)O_(7)` is preferred over `K_(2)Cr_(2)O_(7)` in volumetric analysis
`K_(2)Cr_(2)O_(7)` solution in ACIDIC medium is orange
`K_(2)Cr_(2)O_(7)` solution becomes yellow on INCREASING the PH beyond 7

Solution :`Na_(2)Cr_(2)O_(7)` is hygroscopic.
Discussion
15966.

What is the magnetic momentum of cuprous chloride on the basis of the axial rotation?

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1.73BM
4.90BM
0.0 BM
2.83BM

Solution :`CU^(+)` has no UNPAIRED ELECTRON
Discussion
15967.

Which of the following oxides of nitrogen is called laughing gas ?

Answer»

`NO_2`
`N_2O`
`N_2O_3`
`N_2O_5`

ANSWER :B
Discussion
15968.

When Fe metal is rusted then Fe is:

Answer»

Oxidised
Reduced
Hydrolysed
Precipitated

Answer :A
Discussion
15969.

Which linkage is present in disaccharide ?

Answer»

AMIDE
GLYCOSIDIC
PHOSPHODIESTER
CARBOXYLIC

SOLUTION :Glycosidic
Discussion
15970.

Transition from n = 4, 5, 6 to n = 3 in hydrogen spectrum gives:

Answer»

LYMAN series
Paschen series
Balmer series
P-fund series

Answer :B
Discussion
15971.

Which of the following properties of liquids increases with the increase in temperature?

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VAPOUR pressure
Surface tension
Viscosity
None of these

Answer :A
Discussion
15972.

Which of the following is the industrial method of preparation of acealdehyde?

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`H_(2)C=CH_(2)+H_(2)Ooverset(PD^(++))rarrCH_(3)CHO`
`CH_(3)COCHI+H_(2)overset(Pd)UNDERSET(BaSO_(4))rarrCH_(3)CHO+CHI`
`CH_(3)CNoverset(SnCI_(2))underset(HCI)rarrCH_(3)CH=NHoverset(H_(3)O^(+))rarrCH_(3)CHO`
none of the above

Answer :A
Discussion
15973.

Which one of following has maximum boiling point ?

Answer»

0.2 M NaOH
0.2 M `Na_2CO_3`
0.1 M `AgNO_3`
0.1 M `(NH_4)_2SO_4.FeSO_4.6H_2O`

ANSWER :B
Discussion
15974.

Whichof thefollowingis notlinkedwithmethane ?

Answer»

Marsh GAS
Natural gas
Producer gas
COALGAS

ANSWER :C
Discussion
15975.

The solvent in which enol form of ethylacetoacetate is maximum is

Answer»

`CH_(3)COOH`
AQUEOUS HCI
n-hexane
`H_(2)O`

Answer :C
Discussion
15976.

What would be the freezing point of aqueous solution containing 17 g of C_2H_5OH in 1000 g of water K_f = 1.86 K molality^-1:

Answer»

`-0.69^@C`
`-0.34^@C`
`0.0^@C`
`0.34^@C`

ANSWER :A
Discussion
15977.

Why aniline appears red in colour on standing in air for a long time?

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Solution :Due to strong +R effect of `NH_2` group, the ELECTRON density on the BENZENE ring increases. As a result, aniline is easily oxidised on standing in air for a long TIME to form COLOURED products.
Discussion
15978.

Which aldehyde can not be obtained by Rosenmund reaction:

Answer»

`CH_3CHO`
HCHO
`CH_3CH_2CHO`
All

Answer :B
Discussion
15979.

Write the structures of A, B and C in following (i) C_(6)H_(5)CONH_(2) overset(Br_(2)/NaOH) to A overset (NaNo_(2)+ HCI)underset(O-5^(@)C) to B overset("KI")to C (ii)CH_(3)CI overset("KCN")to A overset (LiAH_(4))to B overset (CHCI_(3)+AICKOH)to C

Answer»

Solution :(i) `C_(6)H_(5)NH_(2), C_(6)H_(5)N_(2)^(+)CI^(-), C_(6)H_(5)I`
(ii) `CH_(3)CN, CH_(3)CH_(2)NH_(2), CH_(3)CH_(2)NC`
Discussion
15980.

Which of the following has zero valency

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SODIUM
BERYLLIUM
ALUMINIUM
KRYPTON

ANSWER :D
Discussion
15981.

Which among the following factors is the most important in making fluorine, the strongest oxidation halogen?

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BOND DISSOCIATION energy
Ionisation enthalpy
Hydration enthalpy
Electron affinity

Answer :C
Discussion
15982.

Which of the following ether produces methyl alcohol when reacts with cold HBr

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2-Methyl 2-methoxy propane
2-methoxy propane
1-methoxy propane
methoxy ETHANE

ANSWER :A
Discussion
15983.

(Y) is including stereoisomers. Value of (X+Y) will be

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SOLUTION :`X = 5, Y = 3`
`X +Y = 8`
Discussion
15984.

underset(II.D_(3)O^(+)) overset(I. OD//D_(2)O)toA+B Which of the following statement is correct?

Answer»



ORDER of reaction of I is 4 at very high CONCENTRATION of `OD^(-)`
Order of reaction is I is 3 at very high concentration of `OD^(-)`

SOLUTION :At very high concentration R.O.R`=K[RCHO]^(2)[OD^(-)]^(2)`

At very high concentration `=`
r.o.r `=`
Discussion
15985.

Write the product(s) of the following reaction : OR (a) Write the mechanism of the following S_(N)1 reaction : (CH_(3) )_(3) C-Br overset(Aq.NaOH)(to) (CH_(3))_(3) C-OH+NaBr (b) Write the equation for the preparation of 2-methyl-2-methoxypropane by Williamson synthesis.

Answer»

SOLUTION : <BR> OR
(a)
(b) `CH_(3) - underset(underset(CH_3)|)overset(overset(CH_3)|)C-ONa+ CH_(3) Br to CH_(3) - underset("2-Methyl-2methoxypropane")(O-underset(underset(CH_3)|)overset(overset(CH_3)|)C-CH_(3))`
Discussion
15986.

Vitamin D deficiency causes ......................

Answer»

RICKETS
SCURVY
CONVULSIONS
CHEILOSIS

SOLUTION :Rickets
Discussion
15987.

Which of the following constitutes basic components of coal tar?

Answer»

XYLENE
Pyridine
Cresol
None

Solution :N/A
Discussion
15988.

Which of the following compounds will not undergo Friedal-Craft's reaction easily

Answer»

Toluene
Cumene
Xylene
Nitrobenzene

Solution :Friedal Craft reaction FAILS when STRONG deactivating group is ATTACHED with BENZENE ring
Discussion
15989.

When t-butyl alcohol is heated with Cu at 573 K, it forms

Answer»

butanal
propanal
ethyl METHYL ketone
2-methyl prop-1-ene

Solution :`(CH_3)_3COH underset"DEHYDRATION"overset"CU 573 K"to (CH_3)_2C=CH_2+H_2O`
Discussion
15990.

Why are reactions of high molecularity less in number?

Answer»

Solution :The basic CONDITION for a chemical reaction is the simultaneous collisions among the reacting species. As the NUMBER of the reacting molecules taking part in a reaction INCREASES, the chances of their simlatenous collisions go one DECREASING. This means that the number of the reacting molecules which are colliding simultaneously is LESS than the number of the molecules actually present. Therefore, the reactions of high molecularity are less in number.
Discussion
15991.

The reagent used in dehydrohalogenation process is:

Answer»

CONC. `H_2SO_4`
`P_2O_5`
`Al_2O_3`
All of these

Answer :D
Discussion
15992.

Which prossesses the largest ionic radius ?

Answer»

FE
`Fe ^(2+)`
`Fe ^(+)`
`Fe^(3+)`

ANSWER :A
Discussion
15993.

Which oneof the is not a surfactant ?

Answer»

`CH_3-(CH_2)_(15)-N-(CH_3)_2 CH_2Br`
`CH_3-(CH_2)_(15)-NH_2`
`CH_3-(CH_2)_(16)-CH_2OSO_2^(-) Na^(+)`
`OHC-(CH_2)_(14)-CH_2-COO^(-)Na^(+)`

Solution :`CH_3-(CH_2)_(15)-NH_2`
Discussion
15994.

When salicylic acid is treated with acetic anhydride, ___________ is obtained .

Answer»

aspirin
paracetamol
salol
benzoic acid

Answer :A
Discussion
15995.

When a 0.1 M solution of an acid at room temperature has degree of ionisation of 10%, the concentration of hydroxyl ions is :

Answer»

`10^(-2)`
`10^(-12)`
`10^(-11)`
`10^(-9)`

ANSWER :B
Discussion
15996.

The resistance of a conductivity cell contaning 0.001M KCl solution at 298K is 1500Omega. What is the cell constant if conductivity of 0.001M KCl solution at 298K is 0.146 xx 10^(-3)S cm^(-3) S cm^(-1).

Answer»

SOLUTION :`"CELL CONSTANT"=kxxR`
`=0.146xx10^(-3)xx1500`
`=0.219cm^(-1)`
Discussion
15997.

Which of the following structure is most uncommon for metals ?

Answer»

SIMPLE CUBIC
b.c.c
c.c.p
h.c.p

ANSWER :A
Discussion
15998.

Why acid anhydride arepreferred to acyl chloride for carrying out acylation reactions?

Answer»

Solution :Acid ANHYDRIDE are preferred to acyl chloride for carrying out acylation reactions.
Because (i) EASILY available (ii) CHEAP (iii) EASY to prepare (iv) Easily undergo acylation without IRRITATING odours
Discussion
15999.

Which of the following is obtained when chloral is boiled with NaOH ?

Answer»

`CH_(3)CL`
`CHCl_(3)`
`"CCl_(4)`
NONE of these

Answer :2
Discussion
16000.

What is the chemical composition of malachite ?

Answer»

`CuO*CuCO_(3)`
`CU(OH)_(2).CuCO_(3)`
`CuO*Cu(OH)_(2)`
`Cu_(2)O.Cu(OH)_(2)`

Answer :B::C
Discussion