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.

Reaction of ammonia gas with excess of dichlorine gas produces .......... and ..........products.

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`NCl_(3), H_(2)`
`NH_(4)CL, Cl_(2)`
`NH_(4)Cl, N_(2)`
`NCl_(3), HCl`

Solution :`NH_(3)(G) + 3Cl_(2)(g)` (excess amount) `to NCl_(3)(g) + 3HCL(g)`
2.

Reaction of aniline with benzaldehyde is

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polymerisation
condensation
addition
substitution

Solution :BENZALDEHYDE CONDENSED with ANILINE and FORMS Schiff.s BASE.
3.

Reaction of alkyl halides with aromatic compounds in presence of anhydrous AlCl_(3) is known as

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Friedal-Craft reaction
Hofmann degradation
Kolbe's synthesis
Beckmann rearrangement

Solution :Acylation or ALKYLATION of aromatic compound in presence of `AlCl_(3)` is known as Friedal-craft reaction.
`underset("BENZENE")(C_(6)H_(6))+underset("CHLORO methane")(CH_(3)Cl) underset(AlCl_(3))overset(DRY)to underset("Toluene")(C_(6)H_(5)CH_(3))+HCl`
4.

Reaction of aldehyde with NH_(2) - OH will be fastest at which of the following P_(H)

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1
6
7
8

Answer :B
5.

Reaction of Alcohol with carboxylic acid in presence of acid catalyst is known as …….. reaction.

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Fermentation
Esterification
Oxidation
Hydration

Solution :`underset("Alcohol")(R- OH)+ underset("Acid")(R. -COOH )overset(H^(+)) hArr underset("ESTER")(R.- COOR)+ H_(2)O`
6.

Reaction of acetone with one of the following reagents involves nucleophilic additionfollowed by elimination of water . The reagent is

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grignard reagent
Sn/CHl
HYDRAZINE in presence of slightly ACIDIC solution
HYDROCYANIC ACID

Solution :hydrazine in presence of slightly acidic solution
7.

Reaction of acetamide with bromine water and KOH gives:

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`CH_(3)COOH`
`CH_(3)CH_(2)NH_(2)`
`CH_(#)COONH_(4)`
`CH_(3)NH_(2).`

Answer :D
8.

The reaction of acetamide with bromine and caustic potash or NaOBr gives :

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ETHANE
ETHYL ALCOHOL
Ethylamine
METHYLAMINE

Answer :D
9.

Reaction of acetaldehyde with HCN followed by hydrolysis gives a compound which shows

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Optical isomerism
Geometrical isomerism
Metamerism
Tautomerism

Solution :`UNDERSET("Acetaldehyde")(CH_(3)-overset(O)overset(||)(C)-H)+underset("Hydrogen CYANIDE")(HCN)overset(H_(3)O^(+))RARR underset("CYnohydrin")underset("Acetaldehyde")(CH_(3)-overset(OH)overset(|)underset(CN)underset(|)(C)-H)` (OPTICALLY active)
10.

Reaction of acetaldehyde withNH_(2)OH will be fastest at which of the following pH?

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1
7
8
6

Answer :D
11.

Reaction of (AAK_MCP_37_NEET_CHE_E37_012_Q01)with HI (one mole) leads to the formation of which one of the following as major product?

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`(AAK_MCP_37_NEET_CHE_E37_012_A01)`

ANSWER :B
12.

Reaction of a compound with conc. KOH gives methanol and potassium formate.Name the compound.

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SOLUTION :METHANAL
13.

Reaction of a carbonyl compound with one of the following reagents involves nucleophilicaddition followed by elimination of water. The reagent is

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hydrazine in presence of feebly ACIDIC solution
hydrocyanic ACID
SODIUM hydrogen sulphite
a GRIGNARD reagent

ANSWER :A
14.

Reaction I^(st) and II^(nd) are

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Both `S_(N)` 1
Both `S_(N)` 1
`(I)S_(N)1,(II)S_(N)2`
`(I)S_(N)2,(II)S_(N)1`

ANSWER :D
15.

Reaction involving carbanion formation is/are:

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CANNIZZARO's reaction
Addition reaction of GRIGNARD reagent
Perkin's reaction
Beckmann's reaction

Answer :B::C
16.

Reaction invoiving anti addition is

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`CH_(2) = CH_(2) overset(H//H_(2)O)to`
`CH_(3)CH = CH_(2) overset(HX)to`
`CH_(3)CH = CH_(2)UNDERSET(NaBH_(4))overset(Hg(OAc)_(2)//H_(2)O)to`
`CH_(2) = CH_(2)underset(H_(2)O_(2)//OH)overset(B_(2)H_(6)//THF)to`

Answer :B
17.

Reaction intermediate in hydration of alkene is

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carbanion
CARBON FREE radicals
carbocation
carbene

ANSWER :C
18.

Reactioninvolving antiaddition is

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`CH_(2)=CH_(2) overset(H^(+)//H_(2)O)(to)`
`CH_(3) CH= CH_(2) overset(HX)(to)`
`CH_(3)CH=CH_(2)overset(Hg(OA_(c))_(2)H_(2)O)underset(NaBH_(4))(to)`
`CH_(2)=CH_(2)overset(B_(2)H_(6)//THF)underset(H_(2)O_(2)//OH)(to)`

SOLUTION :NA
19.

Reaction involved during conversion of 3^(@) alkyl amine to 3^(@) nitro alkane

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HYDROLYSIS
REDUCTION
OXIDATION
PYROLYSIS

Answer :C
20.

Reaction in which yield of prodict will increase with increase in pressure is

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`H_(2(G))+I_(2(g))hArrHI_((g))`
`H_(2)O_((g))+CO_((g))hArrCO_(2(g))+H_(2(g))`
`H_(2)O_((g))+CO_((g))hArrCO_(2(g))+H_(2(g))`
`CO_((g))+3H_(2(g))hArrCH_(4(g))+H_(2)O_((g))`

Solution :In REACTION `CO+3H_(2)hArrCH_(4)+H_(2)O`
Volume is decreasing in forward direction so on increasing pressure the YIELD of product will increase.
21.

Reaction intermediate formed in the formation of salicylaldehyde from phenol (Reimer-Tiemann reaction) is

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Carbocation
Free radical
Carbanion
Carbene

Answer :D
22.

Reaction I : CH_(3)CH_(2)-underset(+N(CH_(3))_(3)OH^(-))(CH-CH_(3))overset("heat")to Product Reaction II : CH_(3)CH_(2)-underset(Br)underset(|)CH-CH_(3)overset(CH_(3)ONa)to Product Products are CH_(3)-CH=CH-CH_(3)(X) CH_(3)CH_(2)CH=CH_(2)(Y)

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The major product in reaction 1 is (X)
The major product in reaction 1 is (Y)
The major product in reaction 2 is (X)
The major product in reaction 2 is (Y)

Solution :`"Rea"^(N)` .1. FOLLOWS Hoffmann.s elimination , `"Rea"^(n)` .2. follows Saytsoff.s rule
23.

Reaction,H_(2)(g)+I_(2)(g)rarr2HI(g)DeltaH=-12.40 kcal.According to this, the heat of formation of HI will be

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12.4 KCAL
`-12.4` kcal
`-6.20` kcal
6.20 kcal

Solution :HEAT of formation is for 1 mole.
Hence `DeltaH_(F)^(@)(HI)=-12.40//2=-6.20 kcal`.
24.

Reaction given below is an example of (AAK_MCP_37_NEET_CHE_E37_036_Q01)

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Wolff-Kishner reduction
Clemmensen reduction
Rosenmund reaction
Stephen reduction

Answer :B
25.

Reaction given in passage is spontaneous because

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NaOH formed is IONIC
`CaCO_(3)` is REMOVED from the reaction mixture
reaction is exothermic
reaction is ENDOTHERMIC

Solution :`CaCO_(3)` is removed from the reaction mixture to produce more NaOH.
26.

Reaction : CH_(3)OH+O_(2) underset(Ag)overset(600^(@))to productThe product is

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`CH_(2)=C=O`
`H_(2)C=O`
`C_(2)H_(4)`
`C_(2)H_(2)`

ANSWER :B
27.

Reaction CH_(3)COOH+C_(2)H_(5)OH to CH_(3)COOC_(2)H+H_(2)O is an illustration of

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dehydration
ESTERIFICATION
neutralization
dehydrogenation

Solution :We know that ,
`CH_(3) COOH + C_(2) H_(5)OH UNDERSET(Delta) OVERSET(CONC. H_(2)SO_(4)) HARR CH_(3)COOC_(2)H_(5)+H_(2)O`.
Thus in this reaction , an ester `(CH_(3)COOHC_(2)H_(5))` is formed . This process is called esterfication .
28.

Reaction : Cu_(("solid"))+2Ag_(("aqueous"))^(+) to Cu_(("aqueous"))^(2+)+2Ag_(("Solid")), what is the equilibrium constant for this reaction ? (E^(@)=0.46V" at "298K Temperature).

Answer»

`2.0xx10^(10)`
`4.0xx10^(10)`
`4.0xx10^(15)`
`2.4xx10^(10)`

Solution :Because `E_(cell)^(Theta)=(0.0591)/(N)logK_(c)`
`therefore 0.46=(0.0591)/(2)logK_(c)`
`therefore logK_(c)=(2xx0.46)/(0.0591)=15.57`
or `K_(c)="Antilog "15.57`
`=3.7xx10^(15)~~4xx10^(15)`.
29.

Reaction favoured by low pressure is :

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`H_2 + I_2 ⇌ 2HI`
`PCl_5 ⇌ PCl_3 + Cl_2`
`N_2 + 3H_2 ⇌ 2NH_3`
`N_2 + O_2 ⇌ 2NO`

ANSWER :B
30.

Reaction, CH_3CNO_2 overset rarrgives :

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`CH_3Br`
`CH_4`
`CH_3OBR`
`CH_3NH_2`

ANSWER :D
31.

Reaction by which benzaldehyde cannot be prepared , is

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GATTERMAN - KOCH synthesis
Etard reaction
Clemmensen REDUCTION
Stephen's reduction

Solution :In clemmensen reduction, carbonyl GROUP is reduce group
32.

Reaction by which benzaldehyde cannot be prepared is

Answer»




Solution :BENZALDEHYDE cannot be prepared by clemmensen reduction. THUS, option (B) is incorrect while all other option are CORRECT.
33.

Reaction by which benzaldehyde cannot be prepared

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`+ Zn//Hg` and CONC. HCL
`+CrO_(2)Cl_(2)` in `CS_(2)` and `H_(3)O^(+)`
`+ H_(2)` and `Pd-BaSO_(4)`

Answer :B
34.

Reaction by which benzaldehyde cannot be prepared :

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in PRESENCE of anhydrous `AlCl_(3)`
+ Zn/Hg and conc. HCL
+ `CR O_(2) Cl_(2)` in `CS_2` FOLLOWED by `H_3 O^(+)`
+ `H_(2)` in presence of `Pd* BaSO_(4)`.

Answer :B
35.

Reaction between solution of phenol in aq.sodium hydroxide and halo alkane will give ether, what is the name of this process of ether preparation ?

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WILLIAMSON's SYNTHESIS
Dow process
Cumene process
None of these

Solution :Williamson.s synthesis
36.

Reaction between NO and O_(2)" to form "NO_(2)" is "2NO + O_(2) rarr2NO_(2) follows the following mechanism No + No k-1 N_(2) O_(2) (in rapid equilibrium) N_(2)O_(2) + O_(2) overset(k_(2))rarr 2NO_(2) (slow) Show that the rate of reaction is given by (1)/(2) ((d[NO_(2)])/(dt))=K[NO]^(2)[O_(2)]

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SOLUTION :To PROVE
37.

Reaction between sodium ethoxide and bromoethane forms

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ETHYL METHYL ether
diethyl ether
dimethyl ether
acetic acid

Solution :`C_2H_5ONa + C_2H_5Br overset(DELTA)to C_2H_5OC_2H_5 + NaBr `
38.

Reaction between Grignard's reagent and cyanogen chloride gives :

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ALKANE nitrile
alkyl CARBYL amine
alkyl amine
alkyl isocyanide

Solution :SEE PROPERTIES of CYANIDES.
39.

Reaction between ethyl bromide and aqueous KOH follows which order kinetics

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ZERO ORDER
seond order
first order
none

Solution :The reaction
`C_2H_5Br + KOHaq to C_2H_5OH + KBR` proceeds by `SN^(2)` mechanism, i.e., it is a second order reaction.
40.

Reaction between barium chloride and sodium sulphate goes to completion bacause

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barium SULPHATE is ALMOST INSOLUBLE
the reaciton is reversible
the solubility of barium chloride decreases
the REACTION is irreversible

Answer :A::D
41.

Calculate the heat of hydrogenation , C_(2)H_(4)(g)+H_(2)(g)toC_(2)H_(6)(g) Given that, the heats of combustion of ethylene, hydrogen and ethane are -337.0, -68.4 and -373.0 kcal respectively.

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`-32.4` KCAL
`-36.3` kcal
`-37.8` kcal
`39.2` kcal

Answer :A
42.

Reaction : A to B follows zero order kinetics and initial concentration of A is 0.01M. If concentration of A is 0.008 M after 10 min, calculate half-life (in minute).

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ANSWER :25
43.

Reaction between an acid and alcohol will give

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HIGHER C CONTAINING acid
Secondary alcohol
Alkane
Ester

Answer :D
44.

Reaction A to B carried out inside a container.Concentration varies as C_t=a+bt.Rate of reaction can be expressed in term of pressure at temp T=300 K, Take b=4, R=1/12 atm mol^(-1) k^(-1) Give your Answer divide by 10.

Answer»


SOLUTION :`AtoB`
`C_1=a+bt`
p=(a+bt)RT
`(DP)/(dt)=dRT " " =4xx1/12xx300=100 "atm" SEC ^(-1)`
45.

Reaction A+BrarrC+D 38 kcal has activation energy 20 kcal. Activation energy for reaction, C+DrarrA+B is

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20 kcal
`-20 kcal`
58 kcal
18 kcal

Solution :GIVEN `DELTAH`=-38kcal
`(E_a)_f`=20 kcal
as `DeltaH=(E_a)_f-(E_a)_b`
`-38=20-(E_a)_b`
`THEREFORE (E_a)_b`=20+38=58 kcal
46.

Reaction A+B rarr C +D+38kcal has activation energy 20 kcal . Activation energy for reaction C+D rarr A+B is :

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20 kcal
`-20` kcal
58 kcal
18 kcal

Solution :(C ) `E_(a) ` (backward )
` =DeltaE +E_(a)` (FORWARD ) = 38 +20 = 58 kcal
47.

Reaction,

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HCHO
HCOOH
`CH_3OH`
`CH_3COOH`

ANSWER :C
48.

Reaction,

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ELECTROPHILIC substitution
Nucleophilic substitution
Electrophilic addition
Nucleophilic addition

Answer :D
49.

Reaction 3ClO^(-)toClO_(3)^(-)+2Cl^(-) occurs in following two steps. (i)ClO^(-)+ClOoverset(K_(1))toClO_(2)^(-)+Cl^(-) (Slow step) (ii)ClO_(2)^(-)+ClO^(-)overset(K_(2))toClO_(3)^(-)+Cl^(-)(Fast step) Then the rate of given reaction =........

Answer»

`K_(1)[CL^(-)]^(2)`
`K_(1)[ClO^(-)]`
`K_(2)[ClO_(2)^(1)][ClO^(-)]`
`K_(2)[ClO^(-)]^(3)`

Answer :A
50.

Reaction : - 3ClO^(-)toClO_3^(-) +2Cl^(-)occursinfollowingtwosteps (i)2ClO^(-)rightarrow ClO_(2)^(-) +Cl^(-)( slow step ) (ii)ClO_(2) ^(-)+ClO^(-)overset(K_(2)) toClO_(3)^(-)+Cl^(-)( fast step) thentherateofgivenreaction- ______.

Answer»

`K_(1)[CLO^(-) ]^(2)`
`K_(1) [ClO^(-)]`
`K_(2)[ClO_(2)^(-)][ClO^(-)]`
`K_(2)[ClO^(-)]^(3)`

ANSWER :A