Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

Observe the following two reactions: (I). CH_(3)-underset(O)underset(||)C-CH+C_(2)H_(5)overset(18)Hoverset(H_(2)SO_(4))to"products"+"water" (II). (X)+"water"overset(("sodium hydroxide")/(Delta))toCH_(3)-underset(O)underset(||)(C)-overset(18)(O)Na+C_(2)H_(5)OH the correct statements are:

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In reaction(I) the PRODUCTS is `CH_(3)-underset(O)underset(||)C-overset(18)O-C_(2)H_(5)`
In reaction (II) the REACTANT is `CH_(3)-underset(O)underset(||)C-overset(18)C-C_(2)H_(5)`
In reaction (II) the REAGENT is `(H_(2)overset(18))/(Naoverset(18)OH)`
Reaction (I) is irreversible while reaction (II) is reversible.

Solution :(i).
(ii). `CH_(3)-underset(O)underset(||)C-OC_(2)H_(5)+H_(2)overset(18)(C)`
`underset("Basic medium")overset((Naoverset(18)(O)H)/(Delta))toCH_(3)-underset(O)underset(||)C-overset(18)(O)Na`
`+C_(2)H_(5)OH`
2.

Observe the following statements? Bleaching powder is used in the preparation of Chloroform II. Bleaching powder decomposes in the presence of CoCl_(2) to liberate O_(2) III. Aqueoue KHF_(2) is used in the preparation of Fluorine.

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I, II and III are correct
Only II is correct
Only I and III are correct
Only I and II are correct.

Solution :FUSED `KHF_(2)` USED in the preparation of flurionebut no AQ `KHF_(2)`
3.

Observe the following statements (i) Silicon doped with P is a p-type semicon­ductor (ii) Presence of Schottky defects decreases the density (iii) Among simple cubic (sc), body centered cubic (bcc) and cubic close packing (ccp) stru ctu res, the p ack in g e fficie n cy is highest for ccp The correct statements are

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I,II and III
I and iii
I and ii
ii and iii

ANSWER :D
4.

Observe the following statements 1) Lanthanides actively participate in chemical reactions 2) The basic nature of hydroxides of lantha nides increases from La(OH)_3to Lu(OH)_3 3) Lanthanides do not form coordinate compounds as readily as d-block metals The correct statements are

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2 & 3
1,2 % 3
1 & 3
1 & 2

Answer :C
5.

Observe the following sequence of reations P shows geometrical isomersm.Q gives positive Tollen's test and the oxidation product of Tollen's test followed by acidification is the strongest acid among its all position isomers. R gives positive lab tests with 2,4-DNP, Fehling solution and I_2//NaOH reagents. Identify the structure of R.

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HCOOH
`CH_3HO`
`BrCH_2-CHO`
`H-oversetoverset(O)(||)C-Br`

SOLUTION :
6.

Observe the following sequence of reations P shows geometrical isomersm.Q gives positive Tollen's test and the oxidation product of Tollen's test followed by acidification is the strongest acid among its all position isomers. R gives positive lab tests with 2,4-DNP, Fehling solution and I_2//NaOH reagents. What could be the structure of Q ?

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ANSWER :D
7.

Observe the following sequence of reations P shows geometrical isomersm.Q gives positive Tollen's test and the oxidation product of Tollen's test followed by acidification is the strongest acid among its all position isomers. R gives positive lab tests with 2,4-DNP, Fehling solution and I_2//NaOH reagents. The compound P can be

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ANSWER :B
8.

Observe the following sequence of reactions P shows geometrical isomersm. Q gives positive Tollen's test and the oxidation product of Tollen's test followed by acidification is the strongest acis among its all position isomers. R gives positive lab test with 2,4,-DNP, Fehling solutioni and I_(2)//NaOH reagents. Identify the structure of R[GOC-POC]

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`HCOOH`<BR>`CH_(3)CHO`
`BrCH_(2)CHO`
`H-overset(O)overset(||)(C)-Br`

Solution :NA
9.

Observe the following sequence of reactions P shows geometrical isomersm. Q gives positive Tollen's test and the oxidation product of Tollen's test followed by acidification is the strongest acids among its all position isomers. R gives positive lab test with 2,4,-DNP, Fehling solution and I_(2)//NaOH reagents. The compound P can be

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SOLUTION :NA
10.

Observe the following sequence of reactions P shows geometrical isomers. Q gives positive Tollen's test and the oxidation product of Tollen's test followed by acidification is the strongest acis among its all position isomers. R gives positive lab test with 2,4,-DNP, Fehling solutioni and I_(2)//NaOH reagents. What could be the structure of Q? [GOC-POC]

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SOLUTION :NA
11.

Observe the following sequence of reaction and answer the questions based on it Phenylacetyleneoverset(CH_3MgBr)underset(-CH_4)toxunderset((ii)H^(o+))overset((i)CO_2)toyunderset(HgSO_4)overset(H_2O // H_2SO_4)tozoverset(Delta)tow Which of the following compound give benzoic acid on KMnO_4 oxidation

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w
y
z
all

Solution :
12.

Observe the following sequence of reaction and answer the questions based on it Phenylacetyleneoverset(CH_3MgBr)underset(-CH_4)toxunderset((ii)H^(o+))overset((i)CO_2)toyunderset(HgSO_4)overset(H_2O // H_2SO_4)tozoverset(Delta)tow Which of the following statement is not correct

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y decolourises `Br_2//H_2O` solution
on HEATING z `CO_2` is LIBERATED
w on REACTION with NAOI gives yellow ppt
x LIBERATES `H_2` gas with Na metal

Solution :
13.

Observe the following sequence of reaction and answer the questions based on it. Phenylacetylene overset(CH_(3)MgBr)underset(-CH_(4))to x overset((i)CO_(2))underset((ii)H^(o+))to y overset(H_(2)O //H_(2)SO_(4))underset(HgSO_(4))to z overset(Delta)to w Which of the following compound give benzoic acid on KMnO_(4) oxidation

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w
y
z
all

SOLUTION :Any mono SUBSTITUTED benzene oxidise to BENZOIC acid.
14.

Observe the following sequence of reaction and answer the questions based on it. Phenylacetylene overset(CH_(3)MgBr)underset(-CH_(4))to x overset((i)CO_(2))underset((ii)H^(o+))to y overset(H_(2)O //H_(2)SO_(4))underset(HgSO_(4))to z overset(Delta)to w Which of the following statement is not correct

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y decolourises `Br_(2)//H_(2)O` solution
z on heating liberates `CO_(2)` gas
w on reaction with NAOL GIVES yellow ppt
x liberates `H_(2)` gas with Na metal

Solution :X is an anion and it has no acidic HYDROGEN
15.

Observe the following sequence of reaction and answer the questions based on it. Phenylacetylene overset(CH_(3)MgBr)underset(-CH_(4))to x overset((i)CO_(2))underset((ii)H^(o+))to y overset(H_(2)O //H_(2)SO_(4))underset(HgSO_(4))to z overset(Delta)to w Compound z is

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`Ph-CH_(2)-OVERSET(O)overset(||)(C)-COOH`

`Ph-overset(O)overset(||)(C)-CH_(2)-COOH`
`Ph-CH_(2)-COOH`

Solution :Z is `Ph-overset(O)overset(||)(C)-CH_(2)-COOH`
16.

Observe the following reactions and its mechanistic steps and intermediate products. The leaving group of step (V) in reaction -2:

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`CH_3COO^(THETA)`
`CO_2`
`PhCOO^(Theta)`
`Ph-CH=CH-COOH`

SOLUTION :
17.

Observe the following sequence of reaction and answer the questions based on it Phenylacetyleneoverset(CH_3MgBr)underset(-CH_4)toxunderset((ii)H^(o+))overset((i)CO_2)toyunderset(HgSO_4)overset(H_2O // H_2SO_4)tozoverset(Delta)tow Compound z is

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`Ph-CH_2-oversetoverset(O)(||)C-COOH`

`Ph-oversetoverset(O)(||)C-CH_2-COOH`
`Ph-CH_2-COOH`

SOLUTION :
18.

Observe the following reactions The reagent R_(1) and R_(2) can be respectively.

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NaI/Acetone, aq. `AgNO_(3)`
AQUEOUS KOH, HI
aq. `AgNO_(3)`, NaI/Acetone
HI, aqueous KOH

Answer :D
19.

Observe the following reactions (I)to (IV) and answer questions Z and W are

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IDENTICAL compounds
Diastereomers
Structural isomers
Homologues

Solution :
20.

Observe the following reactions (I)to (IV) and answer questions X and Y are

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POSITIONAL isomers
Geometrical isomers
Identical compounds
Optical isomers

Solution :
21.

Observe the following reactions and its mechanistic steps and intermediate products. If Ph-CH=O^(18) is used then O^18 is traced inreaction-2:

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`Ph-undersetunderset(O)(||)C-O^(18)-H`
`CH_3-undersetunderset(O)(||)C-C^(18)-H`
`Ph-CH=CH-undersetunderset(O)(||)C-O^(18)-H`
`H-O-undersetunderset(O)(||)C-O^(18)-H`

SOLUTION :
22.

Observe the following reactions and its mechanistic steps and intermediate products. The intermediate product similar to (IV) following in the reaction-(2):

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SOLUTION :
23.

Observe the following reactions and answer the following questions The product T is

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ANSWER :B
24.

Observe the following reactions and answer the following questions The product mixture 'V' does not have.

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SOLUTION :
25.

Observe the following reaction sequence X can be

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SOLUTION :
26.

Observe the following reaction : Which of the following is/are incorrect order of acid strength :

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SOLUTION :
Since a strong acid DISPLACES a WEAK acid from its SALT and FORMS its own salt.
27.

Observe the following reaction sequence carefully.Find the total number of stereoisomers formed in step (6)

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SOLUTION :
28.

Observe the following reaction sequence Answer the following question in the given format: P=Number of organic products formed in step-1 Q=Number of organic products formed in step-2 (singnificant products) R=Number of organic products formed in step-3 (singnificant products) S=In which step aromatic electrophilic substitution has taken place

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SOLUTION :
29.

Observe the following reaction and mention the number which show slowest and rate determine step.

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Solution :In free radical SUBSTITUTION REACTION alkyl free radical formation is RATE DETERMINING step.
30.

Observe the following reaction and mark the correct statement given below-

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METHYL glucosides do not react with Fehling's or Tollen's reagent
The REACTION PASSES through a carbocation
The two forms of glucosides are enantiomers
The non-reducing CHARACTER of glucoside indicates the absence of free-CHO group in it.

Solution :Methyl glycosides can't reduce fehling and Tollen's reagent DUE to absence of free C = O group.
31.

Observe the following reaction and find out that how many number of reactant stereoisomers can be reduced to optically inactive meso products.

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SOLUTION :
32.

Observe the following reaction and determine True statement

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If aromatic RING I have `-NO_(2)` group then RATE of REACTION will decrease.
If aromatic ring II have `-NO_(2)` group then rate of reaction will increase.
In this reaction Wheland intermediate will form.
In this reaction Meisenheimer intermediate is formed.

Solution :It is coupling reaction.
33.

Observe the following reaction, 2A+B rarr C The rate of formation of C is 2.2xx10^(-3)" M m in"^(-1). What is the value of -(d[A])/(dt) ("in moL"^(-1)" m in "^(-1)) ?

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`2.2xx10^(-3)`
`1.1xx10^(-3)`
`4.4xx10^(-3)`
`5.5xx10^(-3)`

SOLUTION :`2A + B rarr C`
`(d[C])/(dt)=(1)/(2) ((-d[A])/(dt)) rArr (-d[A])/(dt) =4.4xx10^(-3)`
34.

Observe the following reaction A_((g))+3B_((g))to2C_((g))The rate of this reaction -(d[A])/("d t") is 3xx0^(-3)"mol. lit"^(-1)."min"^(-1). What is the value of -(d[B])/("d t") in "mol. lit"^(-1)."min"^(-1) ?

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`3xx10^(-3)`
`9XX10^(-3)`
`10^(-3)`
`1.5xx10^(-3)`

Answer :B
35.

Observe the following reaction:2A + B to C The rate of formation of C is 2.2xx10^(3) mol L^(-1) min^(-1).What is the value - (d(A))/(dt) ("in "mol L^(-1) mi n^(-1))

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`2.2xx10^(-3)`
`1.1xx10^(-3)`
`4.4xx10^(-3)`
`5.5xx10^(-3)`

ANSWER :C
36.

Observe the following flow chart and write the sum of the number of x,y, z.

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SOLUTION :
37.

Observe the following feasible reaction: Q. Which of the following is the correct order of acidic strength:

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None

Answer :A
38.

Observe the following feasible reaction: Q. Identify the feasible reactions

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ANSWER :A::D
39.

Observe the following feasible reaction: Q. Which of the following compound does not react with NaHCO_(3).

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ANSWER :A
40.

Observe the following experiment

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SOLUTION :
41.

Observe the following data regarding {:(""2NH_(3)overset(W)(to)N_(2)+3H_(2)),("Pressure (in atm) " :"51020"),("Half life (min)" : "3.61.80.9"):} The unit of K is

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`"min"^(-1)`
`"ATM - min"^(-1)`
`"(atm - min)"^(-1)`
`"atm"^(-2) - "min"^(-1)`

ANSWER :B
42.

Observe the following compounds Number of coumpound which can gives positive Haloform test = (x) Number of compound which can gives positive Lucas reagent test = (y) Report your answer (x+y)

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Solution :Compound `(I), (IV), (V), (VII)` and `(IX)` gives positive haloform compound `(III), (VII)` and `(IX)` gives positive Lucas REAGENT, `x = 5, y = 3` so, `(5+3) = 8`.
43.

Observe the following compound and write the number of hydrogen atom involved in hyper conjugation (with carbocation)?

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Solution :
TOTAL NUMBER of HYDROGEN involved in HYPERCONJUGATION with CARBOCATION =6
44.

Observe the following compound and select +ve & -ve test respectively.

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`+ + + -`
`+ + + +`
`+ - + -`
`+ - - +`

SOLUTION :
45.

Observe the following abbrevations pi_(obs) = observed colligative property assuming normal behaviour of solute. Van't Haff factor (i) is given by

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`i=pi_(OBS)XX pi_(CAL)`
`i=pi_(obs)+pi_(cal)`
`i=pi_(obs)-pi_(cal)`
`i=(pi_(obs))/(pi_(cal))`

ANSWER :D
46.

Observe the esterification mechanisms for primary and teriary alcohols. CH_(3)-COOH+C_(2)H_(5)overset(18)(O)H overset(Conc. H_(2)SO_(4))to(P) CH_(3)-COOH+(CH_(3))_3C-overset(18)(O)H overset(Conc. H_(2)SO_(4))to (Q) In the above reaction (P) and (Q) are respectively

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`CH_(3)- overset(O)overset(||)(C)-O-C_(2)H_(5),CH_3-overset(O)overset(||)(C)-overset(18)(O)-overset(CH_(3))overset(|)UNDERSET(CH_(3))underset(|)(CH)_(3)-CH_(3)`
`CH_(3)-overset(O)overset(||)(C)-overset(18)(O)-C_(2)H_(5),CH_(3)-overset(O)overset(||)(C)-O-underset(CH_(3))underset(|)underset(CH_(3))underset(|)(C)-CH_(3)`
`C_(2)H_(5)-overset(O)overset(||)(C)-overset(18)(O)-CH_(3),CH_(3)-overset(O)overset(||)(C)-O-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`
`CH_(3)-overset(O)overset(||)(C)-overset(18)(O)-C_(2)H_(5),CH_(3)-overset(O)overset(||)(C)-overset(18)(O)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`

SOLUTION :
47.

Observe the esterification mechanisms for primary and teriary alcohols. (+) Octan -2-ol esterifies with Acetic acid to give optically inactive racemised product. It must have gone by

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TYPE I mechanism
Type II mechanism
Mix type I and type II mechanism
more by type I and less by type II mechanism

Solution :Since (+) Octan -2-ol racemises on reaction with acetic ACID, therefore it MUST have GONE through an `S_(N)1` reaction i.e., type II reaction
48.

Observe the esterfication mechanisms for primary and tertiary alcohols. CH_3-COOH+Ph-undersetunderset(C_2H_5)(|)oversetoverset(CH_3)(|)C-OHoverset(Conc.H_2SO_4)to(Y)

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(X) is optically ACTIVE while (Y) is optically INACTIVE
Both (X) and (Y) are optically active
Both (X) and (Y) are optically inactive
(X) is optically inactive while (Y) is optically active

Solution :X is formed by type-1 MECHANISM hence CONFIGURATION is retained.
Y is formed by type-2 mechanism hence recemic product is OBTAINED.
49.

Observe the esterfication mechanisms for primary and tertiary alcohols. CH_3-COOH+C_2H_6overset(18)OHoverset(Conc.H_2SO_4)to(P) CH_3-COOH+(CH_3)_3C-overset(18)OHoverset(Conc.H_2SO_4)(Q) In the above reaction (P) and (Q) are respectively :

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<P>`CH_3-oversetoverset(O)(||)C-O-C_2H_6,CH_3-oversetoverset(O)(||)C-overset(18)(O)-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_3`
`CH_3-oversetoverset(O)(||)C-overset(18)(O)-C_2H_5,CH_3-oversetoverset(O)(||)C-O-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_3`
`C_2H_5-oversetoverset(O)(||)C-overset(18)(O)-CH_3, CH_3-oversetoverset(O)(||)C-O-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_3`
`CH_3-oversetoverset(O)(||)overset(18)(O)-C_2H_6,CH_3-oversetoverset(O)(||)C-overset(18)(O)-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_3`

Solution :P is formed by type-1 MECHANISM and Q is formed by type-2 mechanism.
50.

Observe the esterfication mechanisms for primary and tertiary alcohols. (+) Octan-2-ol esterifies with Acetic acid to give optically inactive recemised product.It must have gone by

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TYPE I MECHANISM
Type II mechanism
Mix type I and type II mechanism
More by type I and LESS by type II mechanism

Solution :Octan-2-ol is `2^@` alcohol, it forms ESTER by type -1 mechanism