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.

Reactivity of halogens towards alkanes is in order

Answer»

'Butene GT PROPENE gt ETHENE'
Butene gt Ethene gt Propene
Ethene gt Propene gt Butene
None of these

Answer :A
Discussion
2.

Reactivity of alcohol in breaking of C-O bond is

Answer»

`1^@ GT 2^@ gt 3^@ `
`3^@ gt 2^@ gt 1^@ `
`3^@ gt 1^@ gt 2^@ `
`1^@ gt 3^@ gt 2^@ `

ANSWER :B
Discussion
3.

Reactions that have standard free energy changes lessthan zero always have equlibrium constnat equal to

Answer»

Unity
Greater than unity
Less than unity
Zero

Solution :`DELTAG^(@)=-2.303RTlogK_(c)`
When `DeltaG^(@)lt0i.e.-ve, then K_(c)GT1.` In this case forward REACTON is FEASIBLE showing THEREBY a large concentration of products.
Discussion
4.

Reactivity of acids in esterification follows the order:

Answer»

HCOOH `GT CH_(3)`COOH `gt RCH_(2)` COOH`gt R_(2)`CHCOOH `gt R_(3)`CCOOH
`CH_(3)`COOH`gt` HCOOH `gt R_(3)` CCOOH `gt R_(2)` CHCOOH `gt RCH_(2)` COOH
`R_(3)`CCOOH`gt R_(2)`CHCOOH `gt RCH_(2)`COOH`gt CH_(3)` COOH `gt`HCOOH
None of the above

Solution :HCOOH `gt CH_(3) "COOH" gt R -CH_(2) -"COOH" gt R_(2) "CHCOOH" gt R_(3)`CCOOH
Discussion
5.

Reactivity of alcohol in breaking O-H bond is

Answer»

`1^@ GT 2^@ gt 3^@ `
`3^@ gt 2^@ gt 1^@ `
`2^@ gt 1^@ gt 3^@ `
`1^@ gt 3^@ gt 2^@ `

ANSWER :A
Discussion
6.

Reactivity of acids in esterification follows the order :

Answer»

`HCOOHgtCH_3COOHgtRCH_2COOHgtR_2CHCOOHgtR_3C COOH`
`CH_3COOHgtHCOOHgtR_3C COOHgtR_2CHCOOHgtRCH_2COOH`
`R_3C COOHgtR_2CHCOOHgtRCH_2COOHgtCH_3COOHgtHCOOH`
None

Answer :A
Discussion
7.

Reactivating in halogen substituted benzene rings is controlled by

Answer»

RESONANCE
INDUCTIVE EFFECT
inductive effect DOMINATES resonance effect
resonance effect dominates inductive effect.

Answer :C
Discussion
8.

Reactions taking place in a fuel cell are:

Answer»

`O_(2)(g)+2H_(2)O(L)+4E^(-)to4OH^(-)(aq)` at the CATHODE
Reaction in (a) at the cathode
`2H_(2)(g)+4OH^(-)(aq)to4H_(2)O(l)+4e^(-)` at the anode
Reaction in (C) at the cathode

Answer :A::C
Discussion
9.

Reactions of zeolite catalysts depend on...............

Answer»

pores
apertures
SIZE of CAVITY
all of these

SOLUTION : all of these
Discussion
10.

Reactions involving stereoisomers To study the involvement of stereoisomers in chemical reactions we shall take up following points: (i)The conversion of an achiral molecule into a chiral molecule, with the generations of a chiral centre. Secondary butyl chloride exist as two enantiomers but mixture is optically inactive due to formation of a racemic mixture.Both enantiomers are obtained in equal amounts.Racemic mixture is an eqnimolar mixture of two enantiomers. (ii)Conversion of chiral molecule into chiral and achiral molecules. Monochlorination of which of the following will give only an achiral products ?

Answer»

n-Pentane
Isopentane
NEOPENTANE
All of these

Solution :neopentane `OVERSET(Cl_2//hv)to CH_3-undersetunderset(CH_3)(|)oversetoverset(CH_3)(|)C-CH_2Cl`(ACHIRAL PRODUCT)
Discussion
11.

Reactions involving stereoisomers To study the involvement of stereoisomers in chemical reactions we shall take up following points: (i)The conversion of an achiral molecule into a chiral molecule, with the generations of a chiral centre. Secondary butyl chloride exist as two enantiomers but mixture is optically inactive due to formation of a racemic mixture.Both enantiomers are obtained in equal amounts.Racemic mixture is an eqnimolar mixture of two enantiomers. (ii)Conversion of chiral molecule into chiral and achiral molecules. Which of the following reactant will give chiral products on monochlorination ?

Answer»

`CH_3-CH_2-CH_3`
`CH_3-undersetunderset(CH_3)(|)CH-CH_3`

SOLUTION :`CH_3-undersetunderset(CH_3)(|)CH-undersetunderset(CH_3)(|)CH-CH_3 OVERSET(Cl_2//hv)toCH_3-undersetunderset(CH_3)(|)CH-undersetunderset(CH_3)(|)CH-CH_2Cl` (CHIRAL PRODUCT)
Discussion
12.

Reactions involving gold have been of particular interest to a chemist. Consider the following reactions, {:(Au (OH)_(3) + 4 HCl rarr HAuCl_(4) + 3 H_(2) O",",Delta H = - 28 k Cal,),(Au (OH)_(3) + HBr rarr HAuBr_(4) + 3 H_(2)O",",Delta H = -36.8 k Cal,):} In an experiment there was an absorption of 0.44 k Cal when one mole of HAuBr_(4) was mixed with 4 moles of HCl. what is the percentage conversion of HAuBr_(4) into HAuCl_(4) ?

Answer»

0.005
0.006
0.05
0.5

Solution :TARGET REACTION
`HAuBr_(4)+4HCL rarr HAuCl_(4)+4HBr`
`DeltaH=8.8`
`%` CONVERSION `=100/8.8 xx0.44=5%`
Discussion
13.

Reactions involving heterolytic fission are said to proceed via:

Answer»

IONIC mechanism
Polar mechanism
BOTH (A) AND (B)
NONE of the above

Answer :C
Discussion
14.

reactions I and II are limited mainly to naphthalene compounds. These reactions are called, respectively:

Answer»

Buchere REACTION and its reversal.
Bischler-Napieralski reaction and its reversal.
Birnbaum-Simonini reaction and its reversal.
Borodine-Hunsdiecker reaction and its reversal.

Solution :NA
Discussion
15.

Reactions in Zeolite catalyst depend on,

Answer»

PORES
APERTURES
SIZE of CAVITY
all of these

ANSWER :d
Discussion
16.

'Reaction with zero order is possible but zero molecularity is not''.Justify the statement.

Answer»

SOLUTION :MOLECULARITY of a reaction is the NUMBER of molecules, atoms or ions which collide simultaneously to bring about reaction. So it is always a natural number. Zero molecularity is no possible.
Order is the sum of power of concentration term in rate LAW. It can be zero.
Discussion
17.

Reaction which will produce chiral product :

Answer»




`CH_(2)=CH-OVERSET(O)overset(||)C-Meoverset(LiAlH_(4))to`

Answer :A::B::C::D
Discussion
18.

Reaction used to convert acid to 1^@ alcohol is

Answer»

OXIDATION
reduction
polymerisation
pyrolysis

Answer :B
Discussion
19.

Reaction used for the preparation of ethers is

Answer»

Reimer-Tiemann reaction
Williamson's SYNTHESIS
WURTZ reaction
Cannizzaro reaction

Answer :B
Discussion
20.

Reaction that takes place at graphite anode in dry cell is

Answer»

`Zn^(2+)+2d^(-)rarrZn(s)`
`Zn(s)rarrZn^(2-)+2e^(-)`
`MN^(2+)+2e^(-)rarrMn(s)`
`Mn(s)rarrMn^(+)+e^(-)+1.5V`

Solution :The reaction which OCCURS at anode is
`Zn(s)rarrZn^(2+)(AQ)+2e^(-)`
Discussion
21.

Reaction taking place at anode in dry cell is :

Answer»

`ZN^(2+) +2E rarr Zn(s)`
`Zn(s) rarrZn^(2+)+2e`
`MN^(2+)+2e rarrMn(s)`
`Mn(s)rarrMn^(2+) +2e`

ANSWER :B
Discussion
22.

Reaction taking place at anode in Daneil cell

Answer»

`ZN^(2+) + 2 e to Zn(s)`
`Zn(s) to Zn^(2+) + 2 e`
`Cu + 2 e^(-) to Cu (s)`
`Cu(s) to Cu^(2+) + 2 e^(-)`

SOLUTION :Zn ACTS as ANODE and oxidised .
`E_(Cu^(2+) | Cu) gt E_(Zn^(2+) | Zn)`
Discussion
23.

Reaction rate between two substance A and B is expressed as following, rate=k[A]^(n)[B]^(m) If the concentration of A is doubled and concentration of B is made half of initial concentration, the ratio of the new rate to the earlier rate will be,

Answer»

`m+n`
`n-m`
`(1)/(2^(n+m))`
`2^(n-m)`

Solution :`R_(1)=K[A]^(n)[B]^(m)`
`R_(2)=k[2A]^(n)[(1)/(2)B]^(m)`
`THEREFORE (R_(2))/(R_(1))=(k[2A]^(n)[(1)/(2)B]^(m))/(k[A]^(n)B^(m))=2^(n)((1)/(2))^(m)=2^(n)*2^(-m)=2^(n-m)`
Discussion
24.

Reaction takes place at anode is

Answer»

IONISATION
REDUCTION
OXIDATION
HYDROLYSIS.

Solution :Oxidation occurs at anode.
Discussion
25.

Reaction of oxirane with RMgX followed with hydrolysis produces :

Answer»

`RCHOHCR_3`
`RCH_2CH_2OH`
`RCHOHCH_3`
`RCH=CHOH`

ANSWER :B
Discussion
26.

Reaction of which among the following ethers with Hl in cold leads to formation of methyl alcohol?

Answer»

ETHYL METHYL ETHER
methylpropyl ether
ISOPROPYL methyl ether
tert-butyl methyl ether

Answer :D
Discussion
27.

Reaction of which among the followingetherswith HI in cold leads to the formation of methyl alcohol?

Answer»

etyhy METHYL ETHER
methyl proplyl ether
ISOPROPYL methyl ether
tert butyl methyl ether

Solution :When asymmetrical ether undergoes REACTION with HI in cold bukier group forms its iodide and smaller group forms its alchohol whereas ifnormal alkyl group present in ether smallergroup formsits iodide
Discussion
28.

Reaction of which among the following ethers with HI in cold leads to formation of alcohol?

Answer»

ethylmethyl ether
methyl propyl ether
ISOPROPYL methyl ether
teri-butyl methyl ether

Solution :`CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-O -CH_(3) +HI overset("Cold")to CH_(3)-OH + CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-I`
Discussion
29.

Reaction of t-butyl bromide with sodium methoxide produces

Answer»

SODIUM TERTIARY butoxide
tertiary BUTYL METHYL ether
isobutane
isobutylene

Answer :D
Discussion
30.

Reaction of t-butyl bromide with sodium methoxide produces :

Answer»

Isobutane
Isobutylene
Sodium t-butoxide
t-butyl METHYL ether

Answer :B
Discussion
31.

Reaction of solid KMnO_(4) with conc. H_(2)SO_(4) produces manganeses heptoxide (Mn_(2)O_(7)) in

Answer»

Solution state
Solid state
Fine powder
None of these

Solution :`KMnO_(4)` on treatment with conc. `H_(2)SO_(4)` forms manganese heptoxide via permanganyl sullphate which DECOMPOSES explosively on heating.
`2KMnO_(4)+3H_(2)SO_(4)rarr2KHSO_(4)+(MnO_(3))_(2)SO_(4)+2H_(2)O`
`(MnO_(3))_(2)SO_(4)+H_(2)Orarrunderset("liquied")underset("red-brown")(Mn_(2)O_(7))+H_(2)SO_(4)`
`Mn_(2)O_(7)rarr2MnO_(2)+(3)/(2)O_(2)`
`therefore Mn_(2)O_(7)` so formed is a red-brown LIQUID.
Discussion
32.

Reaction of solid KMnO_4 with conc H_2SO_4 produces an explosive substance

Answer»

`MnO_2`
`Mn_3O_4`
`Mn_2O_7`
`MNO`

ANSWER :C
Discussion
33.

Reaction of solid KMnO_4 with conc H_2SO_4 produces maganese heptoxide (Mn_2O_7) in:

Answer»

SOLUTION state
Solid state
Fine powder
None

Answer :A
Discussion
34.

Reaction of ROH with R'MgX produces

Answer»

RH
R'H
R-R
R'-R'

Solution :
Discussion
35.

Reaction of SO_(2) with water and alkali is similar to that of

Answer»

`CO_(2)`
`SO_(3)`
CO
`NO_(2)`

ANSWER :A
Discussion
36.

Reaction of SO_(2) with water na alkali is similar to that of

Answer»

`CO_(2)`
`SO_(3)`
`CO`
`NO_(2)`

ANSWER :A
Discussion
37.

Reaction of RCONH_(2) with a mixture of Br_(2) and KOH gives RNH_(2) as the main product. The intermediates involved in the reaction are

Answer»

`R-OVERSET(O)overset(||)C-NHBr`
`R-NHBr`
`R-N=C=O`

SOLUTION :a,c,d are INTERMEDIATE PRODUCTS
Discussion
38.

Reaction of R - overset(O)overset(||)(C) - NH_(2)with a mixtureof Br_(2)andKOHgives R-NH_(2)as the mainproduct . The intemediates (s) involved in thisreaction is/are.

Answer»




SOLUTION :
Discussion
39.

Reaction of RCNH_(2) with a mixture of Br_(2)and KOHgives R-NH_(2) as the main product the intermediate involved in the reaction is

Answer»

`R-OVERSET(O)overset(||)C-Br`
RNHBr
`R-N=C=0`
`R-overset(O)overset(||)C-N`

ANSWER :C
Discussion
40.

Reaction of R-COOH with N_(3)H gives RNH_(2) as the main product The intermediates involved in this reaction are:

Answer»

`RNHNH_(2)`
`RCON_(3)`
RNCO
`RCONH_(2)`

ANSWER :B::C
Discussion
41.

Reactionof R'- OH withR' - Mg Xproduces :

Answer»

R-H
R'-H
R-R
R'-R'

Answer :B
Discussion
42.

Reaction of phenol with dil. HNO_(3) gives

Answer»

<P>p and m-nitrophenols
o- and p-nitrophenols
Picric acid
o- and m-nitrophenols

Solution :
Discussion
43.

Reaction of primary amine with aldehydes gives :

Answer»

Amide
Aldimine
Nitrile
None

Answer :B
Discussion
44.

Reaction of phenol with chloroform/sodium hydroxide to give o-hydroxy benzaldehyde involves the formation of

Answer»

DICHLORO CARBINE
TRICHLORO carbine.
chlorine atoms
chlorine molecules.

Answer :A
Discussion
45.

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group

Answer»

`-CH_(2)Cl`
`-COOH`
`-CHCl_(2)`
`-CHO`

SOLUTION :
Discussion
46.

Reaction of phenol with chloroform/sodium hydroxide to give o- hydroxy benzaldehyde involves the formation of

Answer»

Dichloro carbene
Trichloro carbene
Chlorine atoms
Chlorine melcules

Solution :This is Reimer-Tiemann REACTION where the electrophile is DICHLOROCARBENE `(:"CC"l_(2))` generated from chloroform by the action of a base.
`OH^(-)+CHCl_(3) hArr HOH+:"CC"l_(2)^(-) to CL^(-)+:"CC"l_(2)`
Discussion
47.

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?

Answer»

`-CHCl_2`
`-CHO`
`-CH_2Cl`
`-COOH`

ANSWER :B
Discussion
48.

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?

Answer»

`-COOH`
`-CHCl_(2)`
`-CHO`
`-CH_(2)Cl`

Solution :Chloroform in presence of NaOH INTRODUCES -CHO group in phenol-Reimer-Tiemann reaction.
Discussion
49.

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduce which one of the following fuctional group?

Answer»

`-CHCl_2`
`-CHO`
`-CH_2Cl`
`-COOH`

ANSWER :B
Discussion
50.

Reaction of PCl_3 and PhMgBr would give

Answer»

Bromobenzene
Chlorobenzene
Triphenyl PHOSPHINE
Dichlorobenzene

Solution :Reaction between `PCl_(3)` and PhMgBr gives triphenyl phophine. `3C_(6)H_(5)MgBr +PCl_(3) to (C_(6)H_(5))_(3) P +3MgClBr`
Discussion