Explore topic-wise InterviewSolutions in Current Affairs.

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1.

Tertiary alkyl halide is practically inert to substitution by S_(N) 2 mechanism because of

Answer»

INSOLUBILITY
instability
INDUCTIVE EFFECT
satiric HINDRANCE.

Answer :D
Discussion
2.

Tertiary alkyl halide among the following is

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2 - Chlorobutane
Secondary BUTYL chloride
Isobutyl chloride
3-Chloro-3-methyl PENTANE

ANSWER :D
Discussion
3.

Tertiary alkyl amines on oxidation by KMnO_(4) gives

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`1^(@)` - nitroalkane
`2^(@)` - nitroalkane
`3^(@)` - nitroalkane
`3^(@)` - alcohols

ANSWER :C
Discussion
4.

Tertiaryalkyl amineis

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`1^(0)` - AMINE
`2^(0)` - amine
`3^(0)` - amine
QUATERNARY SALT

ANSWER :A
Discussion
5.

Tertiary alkali halides are practically inert to substitution by SN2 mechanism because of :

Answer»

insolubility
Instability
INDUCTIVE effect
steric effect

Answer :D
Discussion
6.

Tertiary alcohols when passed over heated copper undergo_____to form_____.

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SOLUTION :DEHYDRATION, ALKENES.
Discussion
7.

Tertiary alcohols undergo dehydration by……………… .

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`SN^(1)` MECHANISM
`E_2` mechanism
`E_1` mechanism
`SN^(2)` mechanism

Solution :`E_1` mechanism
Discussion
8.

Tertiary alcohols are resistant to oxidation because

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they do not have `alpha`-hydrogen atom
due to large +I EFFECT of ALKYL group
due to GREATER STERIC hindrance
all of these

Answer :A
Discussion
9.

Tertiary alcohol on treatment with cyanide in presence cone. H_(2)SO_(4) gives corresponding primary amine. T reaction is called as:

Answer»

SCHMIDT REACTION
Curtius DEGRADATION
Leuckart reaction
RITTER reaction

Answer :D
Discussion
10.

Tertiary alcohols are formed by reaction of Grignard reagennt with____or______.

Answer»

SOLUTION :a KETONE or an ESTER other than FORMIC ester.
Discussion
11.

Tertiary alcohols are difficult to oxidise as ________.

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there is no hydrogen ATOM attached to FUNCTIONAL carbon
strong oxidising AGENTS are not available
they havethree alkyl groups
their structureshows STERIC hindrance

Answer :A
Discussion
12.

Tertiary alcohol is obtained when Grignard reagent reacts with :

Answer»

Acetone
Butanone
Propanone
All

ANSWER :D
Discussion
13.

Tertiary alcohol is not ordinarily oxidised, but on restrict oxidation, it yields _____ having one_____ carbon atom.

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SOLUTION :KETONE, LESS.
Discussion
14.

tert-Butylbromide reacts with aq. NaOH by S_(N)1 mechanism while n - butylbromide reacts by S_(N)2 mechanism. Why ?

Answer»

SOLUTION :
Discussion
15.

Tertiary alcohol (3^(@)) having atleast four carbon atoms upon drastic oxidation yield carboxylic acid with

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One carbon atom less
Two carbon atoms less
Three carbon atom less
All the above three options are correct

Solution :Tertiary ALCOHOL are not oxidised EASILY but on drastic conditions, these oxidise to give first ketone and then acid by losing one carbon at each STEP.
.
Discussion
16.

tertiary alcohol is not ordinarily oxidized, but on restrict oxidation, it yields____ having one______carbon atom.

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SOLUTION :KETONE, LESS.
Discussion
17.

Tert-Butylbenzene does not benzoic acid on oxidation with acidic KMnO_(4). Give reason.

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SOLUTION :Due to absence of benzylic hydrogens, tert-butylbenzene does not undergo oxidation to GIVE benzoic acid while other alkylbenzenes such as toluene, ethylbenzene, n-propylbenzene and isopropylbenzene which CONTAIN one or more benzylic hydrogens (marked as `ALPHA`) undergo oxidation to form benzoic acid.
Discussion
18.

Tert -Butyl methyl ether on heating with HI of one molar concentration gives

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` CH_3 OH+ (CH_3) _3 CL`
` CH_3 I+ (CH_3) _3COH`
` CH_3I+ (CH_3) _3CI`
NONE of these

ANSWER :A
Discussion
19.

Tert-butylmethylether ontreatment with hydrogeniodinein coldgives

Answer»

tert-butyl iodide and methyl iodide
tert-butyl alcohol and methyl alcohol
tert-butly alcohol and methyl iodide
terty-butyl iodide and methyl alcohol

Solution :The reaction betweentert-butylmethyletherwith HYDROGEN IODINEIS as FOLLOWS.

`S_(N)1` mechanism is followedis followedas `(CH_(3))_(3)C^(+)`is most stable carbocation and `I^(-)` is attachedto it.
Discussion
20.

Tert-butyl methyl ether on treatment with hydrogen iodide in cold gives

Answer»

tert-butyl iodide and METHYL iodide
tert-butyl ALCOHL and methyl alcohol
tert-butyl alcohol and methyl iodide
tert-butyl iodide and methyl alcohol

SOLUTION :`underset("Tert butyl methyl ether")(CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-O -CH_(3) + HI) overset("COLD")to underset("Tert. butyl iodide")(CH_(3) - overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-I + CH_(3)OH)`
The reaction carried by using `SN^(1)` mechanism.
Discussion
21.

tert-Butylamine is a 3° amine.

Answer»


ANSWER :F
Discussion
22.

tert-Butyl methyl ether on heating with HI gives a mixture of

Answer»

tert-butyl ALCOHOL and METHYL IODIDE
tert-butyl iodide and methanol
isobutylene and methyl iodide
isobutylenne and methanol.

Answer :B
Discussion
23.

Tert-butyl chloride to 2-methylpropene

Answer»

SOLUTION :Tert-butyl chloride to 2-methyl propene :
`CH_(3)-underset(CH_(3))underset("|")overset(CH_(3))overset("|")("C ")-Cl+underset(("alc."))(KOH)overset("HEAT")rarrunderset("2-methyl propene")(CH_(3)-overset(CH_(3))overset("|")("C ")=CH_(2))+KBr+H_(2)O`
Discussion
24.

Tert butyl ethyl ether is prepared by williamson synthesis byreacting

Answer»

SODIUM ethoxide and tert butoxide
sodium ethoxideand tert butyl bromide
sodium tertbutoxide and ETHYL bromide
ethyl alcohol and tert butyl alcohol

ANSWER :C
Discussion
25.

tert-Butyl chloride on treatment with sodium alkoxide yields

Answer»

an ether
an ALKENE
an ALCOHOL
an alkane

Answer :B
Discussion
26.

tert-Butyl bromide reacts with aq. NaOH by S_(N)1 mechanism while n-butyl bromide reacts by S_(N)2 mechanism. Why?

Answer»

Solution :tert-Butyl readily loses `Br^(-)` ion to form STABLE tert-butyl carbocation. Therefore, it undergoes reaction by `S_(N)1` mechanism which occurs in TWO steps. In the first step, tert-butyl carbocation is formed. This step is slow and hence is the rate determining step of the reaction. In the second step, the tert-butyl carbocation is readily attacked by `OH^(-)` ion to form tert-butyl alcohol.

On the other hand, n-butyl bromide does not undergo ionization to PRODUCE n-butyl carbocation because it is not stable. Therefore, it prefers to undergo reaction by `S_(N)2` mechanism which occurs in one step through a transition state involving NUCLEOPHILIC ATTACK of the `OH^(-)` ion from the back side with simultaneous expulsion of `Br^(-)` ion from the front side.
Discussion
27.

Write the relavant chemical equations : tert-butyl bromide to isobutyl bromide

Answer»

SOLUTION :
Discussion
28.

tert-butyl alcohol is more soluble in water than n-butyl alcohol.

Answer»


SOLUTION : SOLUBILITY INCREASES with BRANCHING.
Discussion
29.

tert-Butyl alcohol is much more soluble in water than n-butyl alcohol. Explain.

Answer»

Solution :In tert-butyl alcohol, ALKYL group is HIGHLY branched and hence APPROACHES almost spherical shape. As a result, non-polar part of the molecule becomes less prominent and hence it can have STRONGER intermolecular hydrogen bonds with water molecules. On the other hand, n-butyl alcohol has predominently non-polar character.
Discussion
30.

Terrorists often use ammonium nitrate fertilizer as an ingredient in car bombs . When ammonium nitrate explodes, it decomposes to gaseous nitrogen , oxygen and water vapour. The force of the explasion results from the sudden production of a huge volume of hot gas. It has been claimed that NH_(4) NO_3 fertilizer (NH_4)_(2)HPO_4 Analysis of such a disensitized sample of NH_(4) NO_3 showed the mass % nitrogen to be 33.81%An explosive mixture called Amatol contains :

Answer»

80% `NH_(4) NO_(3) + 20% ` TNT
50% `NH_(4) NO_(3) + 50% ` TNB
`NH_4NO_3 +Al`
`C+NH_(4)NO_3`

SOLUTION :80% `NH_(4)NO_3 +20%` TNT is CALLED Amatox - used explosive.
Discussion
31.

Terrorists often use ammonium nitrate fertilizer as an ingredient in car bombs . When ammonium nitrate explodes, it decomposes to gaseous nitrogen , oxygen and water vapour. The force of the explasion results from the sudden production of a huge volume of hot gas. It has been claimed that NH_(4) NO_3 fertilizer (NH_4)_(2)HPO_4 Analysis of such a disensitized sample of NH_(4) NO_3 showed the mass % nitrogen to be 33.81%NH_4NO_3 on explosion gives

Answer»

`NO_2`
NO
`O_2`
`N_(2)O_3`

Solution :`NH_(4)NO_(3)OVERSET("Explosion")rarrN_(2)+2H_(2)O+1//2O_2`
Discussion
32.

Terpen - 4 - ol is an active ingredient in tea tree oil has the following structure The correct observations for terpen - 4 - ol is/are I. It rotates the plane of plane polarized light. IIIt reacts with baeyer's reagent to form a triol III. On reaction with NaBr and H_2SO_4 , it gives a di bromo compound IV On ozonolysis it gives a compound withmolecular formula C_10H_18O_3.

Answer»

I,II,III and IV
I,III and IV
II and III
III and IV

ANSWER :A
Discussion
33.

Terpenes are

Answer»

FOUR RING CYCLIC structure
unsaturated hydrocarbon
fatty acids
containing HETEROCYCLIC ring

Answer :B
Discussion
34.

Termolite is a silicate mineral with fibrous nature and having tetrahedral unit. The molecular formula of tremolite is Ca_(2)Mg_(x)[Si_(8)O_(22)(OH)_(2)] identify the value of x .

Answer»
Discussion
35.

Terminal carbon in butane is ____hybridised .

Answer»


ANSWER :`sp^3`
Discussion
36.

Teritiary alkyl halides are practically inert to substitution by S_N2 mechanism because of

Answer»

Insolubility
Instability
Inductive EFFECT
STERIC HINDERANCE

ANSWER :D
Discussion
37.

Teritaryalcohols can be prepared using R mg Xwith :

Answer»

Formaldehyde
ACETALDEHYDE
ACETONE
Acetic ACID

ANSWER :C
Discussion
38.

Teritary alcohols are dehydrated by using boiling dilute H_(2)SO_(4) and not con. H_(2)SO_(4) because

Answer»

with conc. `H_(2)SO_(4)` teriary alcohol GIVES mixture of isomerric alkenes
with conc. `H_(2)SO_(4)` most SUBSTITUTED ALKENE is obtained
with con.c `H_(2)SO_(4)` alkenes FORMED undergo polymerisation.

SOLUTION :
Discussion
39.

Terflon is polymer of

Answer»

`FCH=CH_2`
CFH=CHF
`CF_3=CF_3`
`CF_2=CF_2`

ANSWER :D
Discussion
40.

Terflon polymer monomer of

Answer»

difluoroethene
fluoroethene
tetrafluoroethane
tetrafluoroethene

Answer :D
Discussion
41.

Terfenadine is commonly used as alan

Answer»

Tranquilizer
Antihistamine
Antimicrobial
Antibiotic

Answer :B
Discussion
42.

Terfenadine is commonly used as a/an

Answer»

Tranquilizer
ANTIHISTAMINE
Antimicrobial
Antibiotic

SOLUTION :TERFENADINE is COMMONLY USED as antihistamine.
Discussion
43.

Terephthalic acid is obtained by oxidation of which of the following compounds

Answer»




ANSWER :C
Discussion
44.

ter-Butyl methyl ether on heating with HI gives a mixture of

Answer»

ter-Butyl ALCOHOL and METHYL iodide
ter-Butyl iodide and methanol
ISOBUTYLENE and methyl iodide
Isobutylene and methanol.

SOLUTION :`(CH_3)_2C-O-CH_3+Hito(CH_3)_2C-I+CH_3OH`
Discussion
45.

Terephthalic acid is heated with ammonia gives

Answer»

PHTHALAMIDE
PHTHALIMIDE
isophthalic
AMMONIUM phthalate

Answer :B
Discussion
46.

Terfenadine is commonly used as an

Answer»

tranquilizer
ANTIHISTAMINE
ANTIMICROBIAL
antibiotic

Solution :TERFENADINE is antihistamine.
Discussion
47.

ter-Butyl methyl ehter on heating with HI (g) in the presence of ehter gives a mixture of

Answer»

ter-Butyl alcohol and methyl iodide
ter-Butyl iodide and methyl alcohol
ISOBUTYLENE and methyl iodide
Isobutylene and methyl alcohol

Solution :NA
Discussion
48.

ter-Butyl methyl ehter on heating with anhydrous HI in dry ether gives a mixture of

Answer»

ter-Butyl alcohol and METHYL iodide
ter-Butyl iodide and methyl alcohol
ISOBUTYLENE and methyl iodide
None of these.

Solution :SEE the Reactions DUE to OXYGEN.
Discussion
49.

tendency of forming complex µ charge densityprop(1)/("size of atom") Select those species for which white fumes appear on heating:- BeCl_(2)*4H_(2)O,MgCl_(2)*6H_(2)O,CaCl_(2)*6H_(2)O,SrCl_(2)*6H_(2)O

Answer»

1
2
3
4

Answer :B
Discussion
50.

Ten moles of an ideal gas are filled in a closed vessel. The vessel has cylinder and piston type arrangement and pressure of the gas remains constant at 0.821 atm. Which of the following graph represents correct variation of log V vs log T? (V = Volume in litre and T = temperature in Kelvin)

Answer»




ANSWER :A
Discussion