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6201.

Which can show the cis-trans isomerism:

Answer»

`CICH_(2)CH_(2)CI`
`CI_(2)C=C=CH_(2)`
`CH_(2)C=CCI_(2)`
CICH=C=CHCI

Answer :D
Discussion
6202.

Trans-2-methylcyclohexanol + Acetyl chloride to X X+ NaOH (aq) overset(Delta)toY+Sodium acetate.

Answer»




SOLUTION :
Discussion
6203.

Write down the structure and IUPAC name for neo-pentylbromide.

Answer»

Solution :IUPAC NAME : <BR> 1-Bromo-2,2-dimethylpropene
Common name : neo-pentylbromide
`CH_(3)-overset(CH_(3))overset("|")underset(CH_(3))underset("|")("C")-CH_(2)Br`
Discussion
6204.

Which of the following is not a polymer

Answer»

SILK
DNA
DDT
Dextrin

Answer :C
Discussion
6205.

Which two amino acids have the net negative charge at pH = 7.0 ?

Answer»

LYSINE and HISTIDINE
ASPARTIC ACID and GLUTAMIC acid
Aspartic acid and Histidine
Glutamic acid and Lysine

Solution :Aspartic acid and Glutamic acid
Discussion
6206.

Whichof the followingis Sandmeyr'sreaction.

Answer»




ANSWER :C
Discussion
6207.

Write one chemical reaction each to exemplity the following: (i) Rosenmund reduction (ii) Tollens' reagent

Answer»

Solution :(i) Rosenmujnd reduction:
`CH_(3)-underset("Ethanoyl chloride")OVERSET(O)overset(||)(C)-Cl+H_(2)underset("Quinoline")overset(Pd-BaSO_(4),S)(to)CH_(3)-underset("Ethanal")overset(O)overset(||)(C)-H+HCl`
(ii) Tollens. reagent:
`CH_(3)-overset(O)overset(||)(C)-H+2AgNO_(3)+2NH_(4)OHtoCH_(3)-overset(O)overset(||)(C)-OH+underset(("Silver MIRROR"))(2Agdarr)+2NH_(4)NO_(3)+H_(2)O`
Discussion
6208.

The van't Hoff factor for BaCl_2 at 0.01 M concentration is 1.98. The percentage dissociation of BaCl_2 at this concentration is

Answer»

49
69
89
98

Answer :A
Discussion
6209.

Which of the following compound has negligible enol ?

Answer»




`CH_3-oversetoverset(O)(||)C-CH_2-oversetOoverset(||)C-CH_3`

ANSWER :A
Discussion
6210.

Which of the following are antidepressants ?

Answer»

Iproniazid
Phenelzine
Equanil
Salvarsan 

ANSWER :A::B::C
Discussion
6211.

Which of the following compound/s on halogenation give a racemic mixture of products?

Answer»

`(CH_(3))_(4)C`
`CH_(3)CH_(2)CH_(2)CH_(3)`
`CH_(3)CH_(2)CH_(3)`
`CH_(3)CH_(3)`

Solution :Free radical substitutionn occurs by free radical mechanism. Since free radical is a planar species, THEREFORE, it can ATTACK `Cl_(2)` molecule both from above and below the PLANE giving RACEMIC MIXTURE of product. Thus, option (b) is correct.
`CH_(3)CH_(2)CH_(2)CH_(3)underset(-HCl)overset(overset(**)(C)l)to CH_(3)overset(**)(C)HCH_(2)CH_(3) overset(Cl_(2))to (+-)CH_(3)CHClCH_(2)CH_(3)`
Discussion
6212.

What do you mean by activity and selectivity of catalysts ?

Answer»

Solution :Activity: Ability of a catalyst to accelerate chemical reactions is KNOWN as its activity. For EXAMPLE, Pt catalyses the combination of `H_2` and `O_2` to form water. It has been found that for hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity being shown by Group 7-9 ELEMENTS of the periodic table.
SELECTIVITY: The ability of a catalyst to direct a reaction to YIELD a particular product is called its selectivity. Combination of CO and `H_2` yields different products with different catalysts as given below:
` CO(g) + 3H_2(g) overset(Ni) to CH_4(g) + H_2O (g)`
`CO(g) + H_2(g) overset(Cu)to HCHO (g)`
`CO(g) + H_2(g) overset(Cu|ZnO-Cr_2O_3) to CH_3OH(g)` .
Discussion
6213.

Which of the following statement is incorrect for biomolecular nucleophilic substitution reaction (S_(N^(2))

Answer»

It is a second order reaction
In `S_(N^(2))` reaction the substrate does not undergo heterolytic fission
The rate of `S_(N^(2))` reaction does not depends on concentration of both substrate and nucleophilic reagent
`S_(N^(2))` reaction occurs in single step WITHOUT forming intermediate

SOLUTION :In `S_(N^(2))`
Rate of reaction depends upon the concentration of both substrate and reagent.
Hence order of reaction = 2, and it is biomolecular nucleophilic addition reaction.
`UNDERSET("Substrate")(CH_(3))-Cl+aq.underset("Reagent")(KOH) RARR CH_(3)-Cl+K^(+)+Cl^(-)`
Discussion
6214.

Which of the following complexes have a maximum number of unpaired electrons ?

Answer»

`NI(CO)_(4)`
`[Co(NH_(3))_(4)(NO_(2))_(2)]^(+)`
`[AG(CN)_(2)]^(-)`
`[CuBr_(4)]^(2-)`

Solution :`[OVERSET(+2)CuBr_(4)]^(2-)d^(8) config.(sp^(3))`
Discussion
6215.

Which of following species does not exert a resonance effect

Answer»

`C_(6)H_(5)OH`
`C_(6)H_(5)CL`
`C_(6)H_(5)NH_(2)`
`C_(6)H_(5)NH_(3)`

Solution :`C_(6)H_(5)NH_(2)+H^(+)rarrunderset("ANILINIUM ion")(C_(6)H_(5)overset(+)(NH_(2))`
Anilinium ion formed by ANILINE on accepting a proton is less resonance stabilised than aniline. Due to absence of lone pair in conjugation of double bond of BENZENE it does not exert a resonance effect.
Discussion
6216.

WhenHg_(2)Cl_(2) ionizes, the ins produced and the unpaired electrons present on the cation respectivelyare

Answer»

`2HG^(+)` and `2Cl^(-)`, two
`Hg_(2)^(2+) ` and `2Cl^(-) `, two
`Hg_(2)^(2-)` and `2Cl^(-)` , one
`Hg_(2)^(2+)` and `2Cl^(-)`, zero

Solution :`Hg_(2)Cl_(2) rarr Hg_(2)^(2+) + 2Cl^(-) `. Each `HG^(+)` has one unpaired electron. HENCE, `Hg_(2)^(2+)` has no unpaired electron.
Discussion
6217.

The sulphide not soluble in hot dilutenitric acid is

Answer»

CuS
ZnS
CdS
HgS

Solution :HgSis insoluble is CONC ,`HNO_(2)` it issoluble in aqua REGIN
Discussion
6218.

Write the structure of following complex ion[Co(NH_3)_6]^(3+)

Answer»

SOLUTION :OCTAHEDRAL
Discussion
6219.

using Ellingham diagram indicate the lowest temprature at which ZnO can be reducedto zinc metal by carbon.Write the overall reduction reaction at this temprature.

Answer»

Solution :Ellingham diagram shows variation in standard Gibbs free energy change with temperature for the formation of oxide.The Ellingham diagram shows straight line upward slope with formation of oxide,but in case of ZNO there is sudden change,Ellingham diagram helps in the selecting suitable reducing AGENT.
By seeing the Ellingham diagram ,the free energy formation `(Delta_(f)G^(@))` of CO from C becomes lower temprature above 1120 K while that of `CO_(2)` From C becomes lower above 1323 K than `Delta_(f)G^(@)` of ZnO.
As `Delta_(f)G^(@)` of `CO_(2)` from CO is always higher than that of ZnO.So C can reduce is better reducing than CO for ZnO.
`underset(("Magnesite"))(MgCO_(3))overset(800^(@)" to "1000^(@))tounderset(("Magnesia"))(MgO)+CO_(2)uarr`
Discussion
6220.

Trichloroacetaldehyde, C Cl_(3)CHO reacts with chlorobenzene in presence of sulphuric acid and produces:

Answer»




SOLUTION :DDT is FORMED.
Discussion
6221.

Write structures of compounds A and B in each of the following reactions :

Answer»

SOLUTION :
Discussion
6222.

Write structures of compounds A and B in each of the following reactions :

Answer»

SOLUTION :
Discussion
6223.

Write the structure formula of the following compounds. (i) 3-bromo-4 phenylpent - 3- enoic acid (ii) 2-methylbutanoic acid

Answer»

SOLUTION :(i) `CH_(3)-underset(C_(6)H_(5))underset(|)(C)=underset(Br)underset(|)(C)-CH_(2)-COOH`
(ii) `CH_(3)-CH_(2)-overset(CH_(3))overset(|)(CH)-COOH`
Discussion
6224.

The volume of gases NH_(3), CO_(2) and CH_(4) adsorbed by one gram of charcoal at 298 K are in

Answer»

`CH_(4) GT CO_(2) gt NH_(3)`
`NH_(3) gt CH_(4) gt CO_(2)`
`NH_(3) gt CO_(2) gt CH_(4)`
`CO_(2) gt NH_(3) gt CH_(4)`

ANSWER :C
Discussion
6225.

What happens when chlorine is passed through a hot concentrated solution of an alkali like Ba(OH)_2 ?

Answer»

Solution :The EQUATIONS CORRESPONDING to the reactions are given below:
`6Cl_2 + 6Ba(OH)_2 to Ba(ClO_3)_2 + 5BaCl_2 + 6H_2O`
Discussion
6226.

Two aqueous solutions A and B, are separated by a semi-permeable membrane. The osinotic pressure of solution A immediately begins to decrease. Which of the following statements is true?

Answer»

The solvent molecules are moving from the solution of HIGHER osmotic pressure to that of lower osmotic pressure
The initial osmotic pressure of solution B is GREATER than that of solution A.
Solvent molecules are moving from solution B into solution A.
Both (a) and (b).

Solution :Solvent molecules are moving from solution B into solution A HENCE, osmotic pressure of solution A IMMEDIATELY begins to decrease.
Discussion
6227.

There are number of organic compounds including esters, xanthate esters, amine oxides etc., that undergo pyrolytic elimination with heat in the absence of added reagent, either in inert solvent or in the absence of solvent. In general these elimination follow the rate law. Rate prop[Substrate] However reaction is different from E_(1) elimination by the degree of syn-stereoselectivity that they exhibit. These reactions are also known as E_(1) elimination and the degree of syn-stereoselectivity reflect the extent to which they proceed via cyclic transition state. Find the major product of reaction :

Answer»




NONE of these

Solution :N//A
Discussion
6228.

The structures that do not actually exist are called:

Answer»

Tautomers
Conformational isomers
Canonical structures
Optical isomers

Answer :C
Discussion
6229.

There are number of organic compounds including esters, xanthate esters, amine oxides etc., that undergo pyrolytic elimination with heat in the absence of added reagent, either in inert solvent or in the absence of solvent. In general these elimination follow the rate law. Rate prop[Substrate] However reaction is different from E_(1) elimination by the degree of syn-stereoselectivity that they exhibit. These reactions are also known as E_(1) elimination and the degree of syn-stereoselectivity reflect the extent to which they proceed via cyclic transition state. Find the structure of product :

Answer»




SOLUTION :N//A
Discussion
6230.

There are number of organic compounds including esters, xanthate esters, amine oxides etc., that undergo pyrolytic elimination with heat in the absence of added reagent, either in inert solvent or in the absence of solvent. In general these elimination follow the rate law. Rate prop[Substrate] However reaction is different from E_(1) elimination by the degree of syn-stereoselectivity that they exhibit. These reactions are also known as E_(1) elimination and the degree of syn-stereoselectivity reflect the extent to which they proceed via cyclic transition state. Find the major product of the following reaction :

Answer»




NONE of these

Solution :N//A
Discussion
6231.

Which is the correct matched for the following reactions

Answer»




ANSWER :D
Discussion
6232.

Vapour density of a volatile of a volatile substance is 4 in comparison to methane (CH_(4)=1). Itsmolecular mass will be:

Answer»

8
2
64
128

Answer :C
Discussion
6233.

Which of the following are highly reactive towards electrophile

Answer»




Solution :A compound will be reactive towards electrophile if the benzene ring is electronrich.
In (b) and (c ) -OH group and `-NH-oversetoversetO"||"C-R` group will make the benzene ring highly ELECTRON rich due to there ability to donate their electrons inside the benzene ring hence (b) and (c ) are correct.
In (a) and (d) since `-NO_2` and -CHO are electron withdrawing groups they will push electrons from the benzene system and make it electron deficient.
Hence (a) and (d) are WRONG
Discussion
6234.

Usefull lanthanide member is:

Answer»

Cerium
Lanthanum
Neodymium
Lutertium

Answer :A
Discussion
6235.

When 4 gm of a mixture of NaHCO_(3) and NaCl is heated , 0.66 gm CO_(2) gas is evolved . Determine the percentage composition (by mass) of the original mixture.

Answer»


ANSWER :`63%,37%`
Discussion
6236.

The vapour density of a mixture of NO_(2) and N_(2)O_(4) is 38.3 at 26.7^(@)C. Calculate the number of moles of NO_(2) in 100 g of the mixture.

Answer»

Solution :Suppose `NO_(2)` present in 100 g of the mixture = x g
Then `N_(2)O_(4)` present in the mixture `=(100-x)g`
MOLAR MASS of `NO_(2)=14+32="46 g mol"^(-1)`
`"Molar mass of "N_(2)O_(4)="92 g mol"^(-1)`
`"Molar mass of mixture "=2xxV.D.=2xx38.3="76.6 g mol"^(-1)`
Expressing all quantities in TERMS of moles, we should have
`(x)/(46)+(100-x)/(92)=(100)/(76.6)"or"92x+4600-46x=5524.8`
`"or"46x=924.8"or"x=20.1g`
` therefore"No. of moles of NO"_(2)" in the mixture"=(20.1)/(46)=0.437`
Discussion
6237.

Which kind of defects are introduced by doping ?

Answer»

Dislocation defect 
SCHOTTKY defect 
Frenkel defect 
ELECTRONIC defect 

SOLUTION :Doping is done by ADDITION of electron rich or electron DEFICIENT impurities which cause electronic defect.
Discussion
6238.

Which of the following gases reacts with NAOH solution?

Answer»

`CF_(4)`
`SO_(2)`
NO
CO

Answer :B
Discussion
6239.

Which of the following is incorrect statement regarding S_(8) ?

Answer»

SULPHUR is in `sp^(3)` - hybridised STATE
S-S bond LENGTH is 204 pm
Both valency and oxidation state of sulphur are ZERO
The bond angle S - S - S is `107^(@)`

Answer :C
Discussion
6240.

When three isomeric chlorotounes are treated with KNH_(2) in liquid NH_(3), they yield different toluidines as shown below. Explain these observations. ltrgt a. o- Chlorotouene rarr (o : m)- Toluidine b. m- Chlorotouene rarr (o+ m + p)- Touidine c. p- Chlorotouene rarr (m +p)- Touidine

Answer»

Solution :The REACTION involeves aryene intermidediates. In `o-` chlorotouene. Only one `o-` hydrogen is avaiable and so its elimination generates only one `o-` hydrogen is availableand so its elimination generates only one aryne, whereasthe availity of two `o-` hydrogents in `m-` chlorotoulnee generates two aryenes. ALTHOUGH two `o-` hydrogens are available in `p-` chlorotouene, THIER elimination generates only one aryene.
Discussion
6241.

Which of the following cannot be accelerated?

Answer»

`alpha-particl E`
`beta-particl e`
protons
neutrons

Answer :d
Discussion
6242.

What type of drugs mimic the natural messengers by switching on the receptor ?

Answer»

SOLUTION :AGONISTS
Discussion
6243.

Which reagent can convert gtCo group to gtC(C_(6)H_(5)) OH?

Answer»

`C_(6) H_(5)`OH<BR>`C_(6)H_(5)CH_(2)OH`
`C_(6)H_(5)`MgBr
`C_(6)H_(5)`Cl

Solution :`- overset(O)overset(||)(C )- + C_(6)H_(5) - Mg - Br overset(H_(2)O)(rarr) - underset(C_(6)H_(5))underset(|)overset(OH)overset(|)(C ) -`
Discussion
6244.

What is facial isomer?

Answer»

Solution :Octahedral complex of the type `(MA_3B_3) ^(n+-) ` also SHOWS geometrical isomerism.If the three similar LIGANDS (A) are present in the CORNERS of one triangular face of the octahedron and the other three ligands (B) are presentin the opposing triangular face ,then the isomer is referred as a FACIAL isomer (FAC isomer )
Discussion
6245.

When Zn piece is kept in CuSO_(4) solution, the copper get precipitated due to standard potential of zinc is

Answer»

gtcopper
ltcopper
gtsulphide
ltsulphate

Solution :STANDARD POTENTIAL of ZincltCopper.
Discussion
6246.

Ziegler - Natta catalyst is

Answer»

SOLUTION of `SnCl_4` + trialkylaluminium
Solution of `TiCl_4` + trialkylaluminium
Solution of `TiCl_4` + trialkylchromium
Solution of `SnCl_4` + TOLLEN's reagent

Answer :B
Discussion
6247.

Write IUPAC name of (CH_(3))_(2),—CH—CH_(2)—CI

Answer»


ANSWER :The IUPAC NAME is 1-chloro-2-methylropane.
Discussion
6248.

Which compound is deliquescent ?

Answer»

`Hg_2Cl_2`
`HgCl_2`
`ZnCl_2`
`CdCl_2`

ANSWER :C
Discussion
6249.

What is the mole coefficient of H_(2)SO_(4) in the balanced equation. K_(2)Cr_(2)O_(7) + FeSO_(4) + H_(2)SO_(4) rarr K_(2)SO_(4) + Fe_(2)(SO_(4))_(3) + Cr_(2)(SO_(4))_(3) + H_(2)O

Answer»


ANSWER :7
Discussion
6250.

Whichone of theproteintransportsoxygenin the blood stream ?

Answer»

MYOGLOBIN
INSULIN
ALBUMIN
HAEMOGLOBIN

ANSWER :D
Discussion