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.

Hydrolysis of methyl acetate in aqueous solution has been studied by titrating the liberated acetic acid against sodium hydroxide. The concentration of the ester at different times is given below : {:("t/min",,,0,,,30,,,60,,,90),("C/mol L"^(-1),,,0.8500,,,0.8004,,,0.7538,,,0.7096):} Rate =k'["CH"_(3)"COOCH"_(3)]["H"_(2)O]

Answer»

Solution :For the GIVEN reaction, rate `=k'["CH"_(3)"COOCH"_(3)]["H"_(2)O]`
But as `["H"_(2)O]`remains constant, we put `k'["H"_(2)O]=k` so that rate `=k["CH"_(3)"COOCH"_(3)]`
Now, it is a pseudo first ORDER reaction. Hence, for the given data, `k=(2.303)/(t)log""(C_(0))/(C_(t))`
We are given `C_(0)=0.8500" mol L"^(-1)`
`{:("t/min",,,C_(t)//"mol L"^(-1),,,k=(2.303)/(t)log""(C_(0))/(C_(t))),(30,,,0.8004,,,k=(2.303)/(30min)log""(0.8500)/(0.8004)=2.004xx10^(-3)min^(-1)),(60,,,0.7538,,,k=(2.303)/(60min)log""(0.8500)/(0.7538)=2.002xx10^(-3)min^(-1)),(90,,,0.7096,,,k=(2.303)/(90min)log""(0.8500)/(0.7096)=2.005xx10^(-3)min^(-1)):}`
Average value of `k=2.004xx10^(-3)min^(-1)`
Thus, `k'["H"_(2)"O"]=k" or "k'[55" mol L"^(-1)]=2.0074xx10^(-3)min^(-1)`
`:.k'=(2.004xx10^(-3)min^(-1))/(55" mol L"^(-1))=3.64xx10^(-5)" L mol"^(-1)" min"^(-1).`
2.

Hydrolysisof inulin in acidic medium gives ……… .

Answer»

glucose
FRUCTOSE
both a & B
maltose

ANSWER :B
3.

Hydrolysis of maltose (C_12H_22O_11) by invertase give :

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Gluose
Fructose
Both (a) and (B)
None

Answer :A
4.

Hydrolysis of HCN give

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FORMIC acid
Acetic acid
Acetaldehyde
Formaldehyde

Answer :A
5.

Hydrolysis of PI_3 yields:

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ACETIC acid
Formaldehyde
Acetaldehyde
FORMIC acid

Answer :D
6.

Hydrolysis of fats oils yields

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DIHYDRIDE alcohol
Trihydric alcohol
Easters
Unsaturated acids

Answer :B
7.

Hydrolysis of fats and oils yields-

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Dihydric ALCOHOL
TRIHYDRIC alcohol
Esters
MONOHYDRIC alcohol

Answer :B
8.

Hydrolysis of fats and oils in the body produce :

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A CARBOXYLIC acid
Carbon DIOXIDE
A lipase
An Easter

Answer :A
9.

Hydrolysis of ethyl acetate in acidic medium is an example of

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Unimolecular
PSEUDO first ORDER
Zero order
Second order

ANSWER :B
10.

Hydrolysis of ethanoic anhydride gives

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methanoic ACID
PROPANOIC acid
ETHANOIC acid
oxalic acid

ANSWER :C
11.

Hydrolysis ofesters in alkaline medium is known as :

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Saponification
Hydration
Esterification
Alkalisation .

ANSWER :A
12.

Hydrolysis of cumene hydroperoxide is an important reaction in organic chemistry.This reaction involves migration of phenyl group to electron deficient oxygen. Another reaction which involves group migration is the Schmidt reaction, in which isocyanide intermediate is formed. RCOOHunderset((ii)NaN_3)overset((i)PCl_5)toR-undersetunderset(O)(||)C-N_3overset(Delta)toR-N=C=O("Isocyanate")overset(EtOH)toRNHCOOC_2H_5 Now consider the following scheme of reaction and answer the following questions. (i)+CH_3CH=CH_2overset(H^+)toXoverset(H^+ // K_2Cr_2O_7)toYunderset((ii)NaN_3)overset((i)PCl_5)toZoversetDeltatoWoverset(C_3H_7OH)toP (ii)Xunderset((ii)H_3O^+)overset((i)O_2)toX_1+(CH_3)_2C=O The product P should be

Answer»

`C_6H_5OH`
`C_6H_5NHoversetoverset(O)(||)C-NH_2`
`C_6H_5NH-oversetoverset(O)(||)C-NHC_3H_7`
`C_6H_5NHCOOC_3H_7`

SOLUTION :`C_6H_5-N=C=Ooverset(C_3H_7OH)toC_6H_5-NHCOOC_3H_7`
13.

Hydrolysis of d- sucrose result in change of optical rotationbecause:

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number of models of d-GLUCOSE are LESS than the number of moles of l-fructose PRODUCED during hydrolysis.
angle of RATATION of l-fructose is greater than that of d- glucose.
both glucose and fructose are levorotatory.
glucose is l and fructose is d and number of moles of glucose formed during raction are greater than number of moles of fructose.

Solution :N//A
14.

Hydrolysis of DDT is a first order reaction , its half life is 10 years . Time to hydrolyse 10 g DDT to half is

Answer»

100 YEARS
50 years
5 years
10 years

Solution :`K = (0.693)/(t_(1//2)) = (0.693)/(10 "years")`
If INITIAL concentration a = 10 gm and final concentration
`x = (a)/(2) = 5` gm
then , t = `(2.303)/(k)` log `(a)/(a-x) = (2.303)/(0.693) xx 10 xx "log" (10)/(5)`
`= (2.303 xx 10 xx "log" 2)/(0.693) = (2.303 xx 10 xx 0.301)/(0.693) = 10 ` years .
15.

Hydrolysis of cyanogen gives

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OXALIC acid +`NH_(3)`
Oxalic acid
`NH_(3)`
None of these

Solution :HYDROLYSIS of cyanogen gives oxalic acid and `NH_(3)`
16.

Hydrolysis of cumene hydroperoxide is an important reaction in organic chemistry.This reaction involves migration of phenyl group to electron deficient oxygen. Another reaction which involves group migration is the Schmidt reaction, in which isocyanide intermediate is formed. RCOOHunderset((ii)NaN_3)overset((i)PCl_5)toR-undersetunderset(O)(||)C-N_3overset(Delta)toR-N=C=O("Isocyanate")overset(EtOH)toRNHCOOC_2H_5 Now consider the following scheme of reaction and answer the following questions. (i)+CH_3CH=CH_2overset(H^+)toXoverset(H^+ // K_2Cr_2O_7)toYunderset((ii)NaN_3)overset((i)PCl_5)toZoversetDeltatoWoverset(C_3H_7OH)toP (ii)Xunderset((ii)H_3O^+)overset((i)O_2)toX_1+(CH_3)_2C=O What are X and X_1

Answer»




SOLUTION :
17.

Hydrolysis of CH_(3)CH_(2)NO_(2) with 85% H_(2)SO_(4) gives:

Answer»

`CH_(3)CH_(2)OH`
`C_(2)H_(6)`
`CH_(3)CH=NOH`
`CH_(3)COOH`

Answer :D
18.

Hydrolysis of CH_(3)CH_(2)NO_(2) with 85% H_(2)SO_(4) gives

Answer»

`CH_(3)CH_(2)OH`
`C_(2)H_(6)`
`CH_(3)CH=NOH`
`CH_(3)COOH`

Solution :`CH_(3)CH_(2)NO_(2)+H_(2)O OVERSET(H_(2)SO_(4))toCH_(3)COOH+NH_(2)OH`
19.

Hydrolysis of cellulose yields _____.

Answer»

D - GLUCOSE
amylose and AMYLOPECTIN
D - glucose and D galactose
D - FRUCTOSE

SOLUTION :D - glucose
20.

Hydrolysisof CH_(3) - CH_(2) - NO_(2) with 85%H_(2) SO_(4) gives

Answer»

`CH_(3) - CH_(2) - CH_(2) - OH`
`CH_(3) - CH_(2) - COOH`
`CH_(3) - CH_(2) - CH_(3)`
`CH_(3)- CH_(2) - CH = NOH`

ANSWER :B
21.

Hydrolysis of calcium cyanamide gives Hydrazine is formed when ammonia react with

Answer»

`HNO_(3)`
`CA(OH)_(2)`
`H_2SO_4`
NaOCl

Answer :D
22.

Hydrolysis of cane sugar is catalyesd by :

Answer»

`H^+`
MINERAL acids
Enzymes
All

Answer :D
23.

Hydrolysis of benzonitrile gives :

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Benzylamine
Aniline
Benzene
Benzoic acid.

Answer :D
24.

Hydrolysis of an ester is catalysed by H^(+) ion. Using equimolar concentrations of two acids HX and HY both being strong acids. The rate constants of the reaction are found to eb 3xx10^(-3)"min"^(-1) and 5xx10^(-3)"min"^(-1) respectively at a fixed temperature. It can be concluded that.

Answer»

RATE const may be taken as the measure of DEGREE of ionization of one acid used as catalyst.
HX is a stonger acid than HY, RELATIVE strength being 1.7
HX is a weaker acid than HY, their relative strength being 0.7
HX is a stronger base than HY.

Solution :`(st(Hx))/(st(Hy))=SQRT((K_(a1))/(K_(a2)))=sqrt((K_(C_(1)))/(K_(C_(2))))=sqrt((3xx10^(-3))/(5xx10^(-3)))=sqrt(0.6/1)=0.77`
25.

Hydrolysis of an ester in an aqueous solution was studied by titrating the liberated carboxylic acid against sodium hydroxide solution . The concentration of the ester at different time intervals are given below . {:("Time (min)",0,30,60,90),("Ester concentration "mol L^(-1),0.85,0.80,0.754,0.71):} Show that , the reaction follows first order kinetics.

Answer»

SOLUTION :The value of K at different time can be CALCULATED as follows :

This value shows that reaction follows FIRST order KINETICS .
26.

Hydrolysis of an ester may be achived under acidic as well as basic conditions. Pick up the correct statement regarding this

Answer»

Acidic hydrolysis is faster than alkaline hydrolysis.
Alkaline hydrolysis is faster than acidic hydrolysis.
Bothoccur at the same rate.
In both, the FIRST step is protonation of the `-OH` part of the `-COOH` group.

Solution :Alkaline hydrolysis is irreversible because here `RCOO^(-)` is ISOLATED , MOREOVER the PRODUCT `RCOO^(-)` stabilizes itself DUE to resonance.
27.

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane ester is

Answer»

METHYL ethanoate
methyl methanoate
ETHYL methanoate
methyl propanoate

ANSWER :A
28.

Hydrolysis of an ester gives acid A and alcohol B. The acid reduces Fehling's solution. Oxidation of alcohol B gives acid, A. The ester is

Answer»

METHYL formate
Ethyl formate
Methyl acetate
Ethyl acetate

Answer :A
29.

Hydrolysis of an ester gives a carboxylic acid which o Kolbe's electrolysis yields ethane. The ester is

Answer»

ETHYL methonoate
Methyl ethanoate
Propylamine
Ethylamine

Solution :
30.

Hydrolysis of an ester gives acid A and alcohol B. The acid reduces Fehling's solution. Oxidation of alcohol gives acid A. The ester is :

Answer»

METHYL FORMATE
ETHYL formate
Methyl acetate
Ethyl acetate

Answer :A
31.

Hydrolysis of alkyl halides has been compared. Which of the following comparision is incorrect ?

Answer»

`CH_(2)=CHBR gt CH_(2) = CHCH_(2)BR`

`CH_(3)gt CH_(3)Cl`
`(CH_(3))_(2)CHBr gt CH_(3)CH_(2)CH_(2)Br`

SOLUTION :`CH_(2)=CHBr` has stronger `C-Br` bond
THUS, hydrolysis is slower.
32.

Hydrolysis of adenosine triposphate involves rupture of

Answer»

Base-sugar BOND
Sugar-phosphate bond
`P-O-P` bond 
`P-N-P` bond 

ANSWER :C
33.

Hydrolysis of adenosine triphosphate, involves rupture o:

Answer»

Base-sugar bond
Sugar-phosphate bond
P-O-P bond
Consumption of the WHOLE molecule

Answer :C
34.

Hydrolysis of adenosine triphosphate, involves rupture of:

Answer»

Base-sugar bond
Sugar-phosphate bond
P-O-P bond
Consumption of the WHOLE molecule

Answer :C
35.

Hydrolysis of acid anhydride gives

Answer»

aldehydes
KETONES
acid amides
CARBOXYLIC acid

ANSWER :D
36.

Hydrolysis of acetamide produces

Answer»

Acetic acid
ACETALDEHYDE
Methyl AMINE
FORMIC acid

Answer :A
37.

Hydrolysis of acetonitrile in acidic medium gives

Answer»

`CH_3CH_2OH`
` CH_3NC`
` CH_3CH_2CHO`
` CH_3COOH `

ANSWER :D
38.

Hydrolysis of (+)-sucrose (ordinary table sugar) yields

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D-glucose
D-fructose
D-galactose
More than ONE of the above

Answer :D
39.

Hydrolysis is regarded as an interaction between :

Answer»

`H^+ , `OH^-` IONS
ions of acid with ions of base
ions of salt with ions of water
acid and base

Answer :C
40.

Hydrolysis acyl halide gives

Answer»

aldehydes
ketones
carboxylic ACIDS
ESTERS

ANSWER :C
41.

Hydrolith is

Answer»

`CaH_2`
`CA(OH)_2`
`CaCO_3`
`CaSO_4`

ANSWER :A
42.

Hydrogenaton of vegetable thee at 25^(@)C reduces pressure of H_(2) from 2 atm to 1.2 atm in 50 minute. The rate of reaction in terms of molarity per second is

Answer»

`1.06xx10^(-6)`
`1.06xx10^(-5)`
`1.06xx10^(-7)`
`1.06xx10^(-9)`

Solution :`r_(((ATM)/t))=r_((M/t))xxRxxT,(r_(mu))/("sec")=0.00325/323=1.006xx10^(-5)`
43.

Hydrogenation of vegetable oils in the presence of finaly divided nickel as catalyst, the reaction is :

Answer»

ENZYME CATALYSED reaction
liquid catalysed reaction
homogeneous catalyst
hetrogeneous catalyst

Answer :D
44.

Hydrogenation of vegetable oils in the presence of finely divided nickel as catalyst. The reaction is

Answer»

enzyme catalysed reaction
liquid catalysed reaction
heterogeneous catalysis
homogeneous catalysis.

Solution :HYDROGENATION of VEGETABLE oils in presence of finely divided NICKEL as catalyst is an example of heterogeneous catalytic reaction because one of the reactants is in liquid state and the other is in gaseous state, while the catalyst is in solid state.
`"Vegetable OIL"_(l)+H_(2(g)) overset(Ni_(s))to "Vegetable ghee"_(s)`
45.

Hydrogenation of vegetable oils in presence of finely divided Nickel as catalyst. The reaction is

Answer»

ENZYME CATALYSED REACTION
HOMOGENEOUS catalysis
Heterogeneous catalysis
Liquid catalysed reaction

Answer :C
46.

Hydrogenation of vegetable ghee at 25^@C reduces pressure of H_2 from 2 atm to 1.2 atm in 50 minute. The pressure of H_2 from 2 atm to 1.2 atm in 50 minute. The rate of reaction in terms of molarity per second is :

Answer»

`1.09xx10^-6`
`1.09xx10^-5`
`1.09xx10^-7`
`1.09xx10^-5`

ANSWER :B
47.

Hydrogenation of phenol in the presence of Nickel gives ……………… .

Answer»

CYCLO hexane
eyclo HEXANOL
BENZENE
CUMENE

SOLUTION :eyclo hexanol
48.

Hydrogenation of ethylene in the presence of nickel catalyst follows ........... theory.

Answer»

SOLUTION :ADSORPTION
49.

Hydrogenation of oils involves :

Answer»

Saturation of UNSATURATED FATTY acid
Reaction with oxygen
CONVERSION into fatty acid
Driving of the IMPURITIES in oil by hydrogen gas

Answer :A
50.

Hydrogenation of coal is donefor theproductionofsyntheticpetrol in :

Answer»

SABATIER process
Bergius process
cracking proess
nene of these

Answer :B