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.

Sucrose is not a reducing sugar since

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It is chemically stable
it contains no free ALDEHYDE or keto GROUP ADJACENT to a group
it is BUILT up of a FRUCTOSE unit
it is optically active.

Answer :B
2.

Sucrose is dextrorotatory but the mixture obtanied after hydrolysis is laevorotatory. Explain.

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SOLUTION :Sucrose is dextrorotatory, with a specific rotation of `[alpha]_(D)=+66.5^@` but on hydrolysis , it GIVE EQUIMOLAR amounts of glucose which is dextrorotatory and FRUCTOSE which is laevorotatory. Since the laevorotation of fructose `(-92.4^@)` is much more than dextrorotation of glucose `(+52.5^@)` , therefore , the resulting SOLUTIONS becomes laevorotatory.
3.

Sucrose is not

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a di-saccharide
a non-reducing sugar.
HYDROLYSED to only GLUCOSE
hydrolysed to glucose & FRUCTOSE

SOLUTION :hydrolysed to only glucose
4.

Sucrose is made up of :

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GLUCOPYRANOSE and fructopyranose
A glucopyranose and d fructofuranose
A glucopyranose and d fructofuranose
A glucopyranose and fructopyranose

ANSWER :B
5.

Sucroseis dextroroatorybut the mixtureobtainedafter hydrolysis is lavorotatory . Explain.

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Solution :On hydrolysis sucrosegives GLUCOSE WHICHIS dextrorotatory withspecific rotation of `+52.5^(@)` and fructosewhichis laevorotorywithspecific rotation`- 92.4^(@)` . As laevorationof fructoseis greaterthan the dextrorotationof glucose , the MIXTUREIS laveorotatory.
6.

Sucrose is also called …………sugar.

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SOLUTION :INVERT (or) NON REDUCING
7.

Sucrose is a non reducing sugar. Justify.

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Solution :In sucrose, `C_(1)` of `ALPHA`- D-glucose is jioned to `C_(2)` of -D-fructose. The glycosidic bond THUS FORMED is called `alpha`-1,2 glycosidic bond , Since, the both the carbonyl carbons (reducin groups) are invoved in the glycosidic bonding . Sucrose is a nonreducing sugar.
8.

Sucrose is commonly known as _____.

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FRUIT SUGAR
table sugar
grape sugar
table salt

Solution :table sugar
9.

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law, witht_(1//2)=3.00 hours. What fraction of the sample of sucrose remains after 8 hours?

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Solution :First order rate equation is :
`k=(2.303)/(t)"log"([A]_(0))/([A])""…(i)`
As `t_(1//2)=3.0` hours
`therefore k=(0.693)/(t_(1//2))=(0.693)/(3H)=0.231h^(-1)`
SUBSTITUTING the values in equation(i), we GET
`0.231 H^(-1)=(2.303)/(8h)"log"([A]_(0))/([A]) or "log"([A]_(0))/([A])=0.8024`
or `([A]_(0))/([A])="Antilog "(0.8024)=6.345 " or"([A])/([A]_(0))=(1)/(6.345)=0.158`.
`([A])/([A]_(0))` represents the fraction of SUCROSE left after 8 hours.
10.

Sucrose hydrolyses in presence of enzyme invertase, to give glucose and fructose. However, this reaction does not occur in presence of maltase , because-

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in presence of maltase, the ENERGY of ACTIVATION of the reaction increases
reaction of SUCROSE with maltase forms stable complex
maltase changes the structure of sucrose
enzymatic activity is highly specific

Answer :D
11.

Sucrose decomposes in acid solution into glucose and fructose according to the first order rate law with t_(1//2)=3.00 hours. What fraction of the sample of sucrose remains after 8 hours ?

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Solution :As sucrose decomposes ACCORDING to first order RATE law, `k=(2.303)/(t)log""([A]_(0))/([A])`
The aim is to find `[A]//[A]_(0)`
As `t_(1//2)=3.0" hour,":.k=(0.693)/(t_(1//2))=(0.693)/(3" hr")=0.231" hr"^(-1)`
HENCE, `0.231" hr"^(-1)=(2.303)/(8" hr")log""([A]_(0))/([A])" or "log""([A]_(0))/([A])=0.8024" or "([A]_(0))/([A])=" Antilog "(0.8024)=6.345`
or `([A])/([A]_(0))=(1)/(6.345)=0.158.`
12.

Sucrose is a non-reducing sugar.

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ANSWER :1
13.

Sucrose decompose in acid solution into glucose andfructose according to the first order rate law, with t_(1/2)=3.00 hours. What fraction of sample of sucrose remains after 8 hours ?

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1.158M
0.518M
0.158M
3.182M

Answer :C
14.

Sucrose contains which of the following groups

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`-CHO`
` GT C=O`
both (a) and (B)
NONE of these

Answer :D
15.

Sucrosecontain

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1-2 `alpha-beta`-ACETAL BOND
1-2 `alpha-alpha`-acetal bond
1-2 `beta-alpha`-acetal bond
1-2 `beta-beta` acetal bond

ANSWER :A
16.

Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives ..........

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2 MOLECULES of glucose
2 MOLES of glucose `+1` molecule of FRUCTOSE
1 molecule of glucose `+1` molecule of fructoes
2 molecules of fructose

ANSWER :C
17.

Sucrose (canc sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives…………………

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2 MOLECULES of glucose
2 molecules of glucose + 1 molecule of FRUCTOSE
1 molecule of glucose + 1 molecule of fructose
2 molecules of fructose Ans

Solution :1 molecule of glucose +1 molecule of fructose
18.

Sucrose contains glucose and fructose linked by

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`C_(1)-C_(1)`
`C_(1)-C_(2)`
`C_(1)-C_(4)`
`C_(1)-C_(6)`

SOLUTION :`C_(1)-C_(2)`
19.

Sucrose (can sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives.

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2 molecules of GLUCOSE
2 molecules of glucose +1 molecule of fructose
1 molecule of glucose +1 molecule of fructose
2 molecules of fructose

Solution :`UNDERSET("Sucrose")(C_(12)H_(22)O_(11))overset("Hydrolysis")tounderset("Glucose")(C_(6)H_(12)O_(6))+underset("Fructose")(C_(6)H_(12)O_(6))`
20.

Sucrose and lactose are diferentiatedby :

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Tollen's reagent
FEHLING
iodoform
`NaHSO_(3)`

SOLUTION :N//A
21.

Sucroseandmaltoseare disaccharidesbutsucrosein a nonreducingsugar while maltoseis a reducingsugar . Givereason .

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Solution :(i)Sucrrose isa disaccharide that composed of `alpha ` -D glucose and `beta` - Dfrucotose. In sucrose C1 of`alpha ` - Dglucoseis joinedto C2 of D - FRUCTOSE . The glycosidicc bondthus formedis CALLED `alpha` -1,2- glycosidicbond . Since boththe carbonlycarbons(reducingcarbons) are involvedin thhe glycosidic bonding , sucroseis a non - reduccingsugar.
(ii) Butmaltosecontianstwomolecules ofx - Dglucoseunitsthat are linked by an `alpha -1, 4`glycosidic bond . Anomericcarbon of one unitand C- 4 of otherunit are CONNECTED together . Sinceone of theglucose has the carbonlygroupintact it actsas reducingsugar.
22.

Sucorse hydrolyses readily in acids to give

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TWO MOLECULES of GLUCOSE
two molecules of fructose
one molecules of glucose and fructose
one molecules of glucose and galactose

Answer :C
23.

Sucrolose structure is similar to

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Saccharin
Sucrose
Fructose
Glucose

ANSWER :B
24.

Succinimide when subjected to Hofmann bromamide reaction gives a compound having one of the given structures. Select the correct structure:

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ANSWER :B
25.

Successive ionization enthalpies (in eV/atom) of on element are 5,8,9,90,100. The number of valence electrons are:

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1
2
3
4

Solution :NUMBER of valence ELECTRON =3 as DIFFERENCE between `IE_(3) & IE_(4)` is very high.
26.

Succinaldehyde on reaction with P_(2)O_(5)0 produces organic compound x, x is having number of pi electrons.

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ANSWER :6
27.

Successive ionisation energies (I.E.) for an element A are as A overset(I.E_(1))toA^(+) overset(I.E_(2))toA^(2+) overset(I.E_(3))toA^(3+) If I.E_(1) and I.E_(3) are 27 kJ/mol and 51 kJ/mol respectively, then the value of I.E_(2) is

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63
21
59
33

Answer :D
28.

Successive emission of an alpha - particle and two beta- particles by an atom of an element results in the formation of its :

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Isodiapher
ISOBAR
Isotope
Isotone

Solution :`""_(Z) X^(A1) overset(- alpha - 2 (beta))(to) ""_(Z) X^(A2) `, so isotope is FORMED
29.

Substrate is bound with ........ of enzyme.

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nearby
ACTIVE SITE
inactive site
allosteric site

Solution :active site
30.

Successive emission of an alpha-particle and two beta -particle by an atom of an element results in the formation of its

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Isobar
Isomorph
Isotope
Isome

Solution :`._(Z)A^(m) RARR ._(z)B^(m-4) + ._(2)He^(4) + 2 ._(-1_e^(0)`
31.

Subunits present in haemoglobin are :

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2
3
4
5

Answer :C
32.

Substrate E2 elimination SN2 — substitution {:((A)CH_(3)-CH_(2)-Br,(P)1,(W)~~0),((B)(CH_(3))_(2)CH-Br,(Q)80,(X)20),((C)(CH_(3))^(3)CBr,(R)100,(Y)90):}

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<P>

ANSWER :`A to P , Y ; B to Q , X;C to R ,W`
33.

Substitution reactions of alkyl halide are initiated by,

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ELECTROPHILE
nucleophile
free readical
NONE of these

Answer :B
34.

Substitution of one or more hydrogen atom(s) from a hydrocarbon by another atom or a group of atoms result in the formation of an entirely new compound having altogether different properties and applications. Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively, is replaced by -OH group. These classes of compounds find wide applications in industry as well as in day-to-day life. For instance, have you ever noticed that ordinary spirit used for polishing wooden furniture is chiefly a compound containing hydroxyl group, ethanol. The sugar we eat, the cotton used for fabrics, the paper we use for writing, are all made up of compounds containing -OH groups. Just think of life without paper, no note-books, books, newspapers, currency notes, cheques, certificates, etc. The magazines carrying beautiful photographs and interesting stories would disappear from our life. It would have been really a different world. An alcohol contains one or more hydroxyl (OH) group(s) directly attached to carbon atom(s), of an aliphatic system (CH_(3)OH) while a phenol contains -OH group(s) directly attached to carbon atom(s) of an aromatic system (C_(6)H_(5)OH). Give the name of next two homologoues of CH_(3)OH.

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SOLUTION :`C_(2)H_(5)OH" (Ethanol) and "C_(3)H_(7)OH" (PROPANOL)"`.
35.

Substitution of one or more hydrogen atom(s) from a hydrocarbon by another atom or a group of atoms result in the formation of an entirely new compound having altogether different properties and applications. Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively, is replaced by -OH group. These classes of compounds find wide applications in industry as well as in day-to-day life. For instance, have you ever noticed that ordinary spirit used for polishing wooden furniture is chiefly a compound containing hydroxyl group, ethanol. The sugar we eat, the cotton used for fabrics, the paper we use for writing, are all made up of compounds containing -OH groups. Just think of life without paper, no note-books, books, newspapers, currency notes, cheques, certificates, etc. The magazines carrying beautiful photographs and interesting stories would disappear from our life. It would have been really a different world. An alcohol contains one or more hydroxyl (OH) group(s) directly attached to carbon atom(s), of an aliphatic system (CH_(3)OH) while a phenol contains -OH group(s) directly attached to carbon atom(s) of an aromatic system (C_(6)H_(5)OH). Write the structure of a ring compound containing the hydroxyl group but not directly linked to the ring.

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SOLUTION : BENZYL ALCOHOL.
36.

Substitution of one or more hydrogen atom(s) from a hydrocarbon by another atom or a group of atoms result in the formation of an entirely new compound having altogether different properties and applications. Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively, is replaced by -OH group. These classes of compounds find wide applications in industry as well as in day-to-day life. For instance, have you ever noticed that ordinary spirit used for polishing wooden furniture is chiefly a compound containing hydroxyl group, ethanol. The sugar we eat, the cotton used for fabrics, the paper we use for writing, are all made up of compounds containing -OH groups. Just think of life without paper, no note-books, books, newspapers, currency notes, cheques, certificates, etc. The magazines carrying beautiful photographs and interesting stories would disappear from our life. It would have been really a different world. An alcohol contains one or more hydroxyl (OH) group(s) directly attached to carbon atom(s), of an aliphatic system (CH_(3)OH) while a phenol contains -OH group(s) directly attached to carbon atom(s) of an aromatic system (C_(6)H_(5)OH). What is the name and formula of the compound used to polish wooden furniture ?

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SOLUTION :`C_(2)H_(5)OH,` Ethanol.
37.

Substitution reactions may be:

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FREE RADICAL substitution
Nucleophilic substitution
Electrophilic substitution
All are correct

Answer :C
38.

Substitution of one or more hydrogen atom(s) from a hydrocarbon by another atom or a group of atoms result in the formation of an entirely new compound having altogether different properties and applications. Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively, is replaced by -OH group. These classes of compounds find wide applications in industry as well as in day-to-day life. For instance, have you ever noticed that ordinary spirit used for polishing wooden furniture is chiefly a compound containing hydroxyl group, ethanol. The sugar we eat, the cotton used for fabrics, the paper we use for writing, are all made up of compounds containing -OH groups. Just think of life without paper, no note-books, books, newspapers, currency notes, cheques, certificates, etc. The magazines carrying beautiful photographs and interesting stories would disappear from our life. It would have been really a different world. An alcohol contains one or more hydroxyl (OH) group(s) directly attached to carbon atom(s), of an aliphatic system (CH_(3)OH) while a phenol contains -OH group(s) directly attached to carbon atom(s) of an aromatic system (C_(6)H_(5)OH). Give some examples of compounds of daily use which contain hydroxyl group.

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SOLUTION :SUGAR, COTTON and PAPER.
39.

Substitution of one or more hydrogen atom(s) from a hydrocarbon by another atom or a group of atoms result in the formation of an entirely new compound having altogether different properties and applications. Alcohols and phenols are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively, is replaced by -OH group. These classes of compounds find wide applications in industry as well as in day-to-day life. For instance, have you ever noticed that ordinary spirit used for polishing wooden furniture is chiefly a compound containing hydroxyl group, ethanol. The sugar we eat, the cotton used for fabrics, the paper we use for writing, are all made up of compounds containing -OH groups. Just think of life without paper, no note-books, books, newspapers, currency notes, cheques, certificates, etc. The magazines carrying beautiful photographs and interesting stories would disappear from our life. It would have been really a different world. An alcohol contains one or more hydroxyl (OH) group(s) directly attached to carbon atom(s), of an aliphatic system (CH_(3)OH) while a phenol contains -OH group(s) directly attached to carbon atom(s) of an aromatic system (C_(6)H_(5)OH). How are alcohols and phenols formed ?

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Solution :ALCOHOLS and phenols are formed by removing a hydrogen from the ALIPHATIC and AROMATIC hydrocarbon respectively and SUBSTITUTING with a hydroxyl group.
40.

Substitution of one alkyl group by replacing hydrogen of primary amines :

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INCREASES the BASE STRENGHT
Decreases the base strenght
REMAINS the same
None

Answer :A
41.

Substitution can take place with alkyl halides by two different mechanisms, S_(N)1 " and " S_(N)2.

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ANSWER :1
42.

Substitution of chlorine takes place readily at higher temperature in

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`CH_(3)-CH=CH_(2)`
`CH_(2)=CH_(2)`
`CH-=CH`
NONE of the above

ANSWER :A
43.

Substituent on phenyl ring. {:((A)-CH_(2)-CH_(3),(P) o//p-"directors"),((B)-O-overset(O)overset("||")(S)-CH_(3),(Q) "meta directors"),((C)-NH-overset(O)overset("||")(C)-CH_(3),(R)" Activating group"),((D)-underset(O)underset("||")(S)-CH_(3),(S)" Deactivating group"):}

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<P>

ANSWER :`A RARR P , R ; Brarr P, R ; C rarr P , R ; D rarr P , R , R`
44.

Substances which rotate the plane polarised light are called :

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OPTICALLY active
Geometrical isomers
Tautomers
Mirror IMAGES

ANSWER :A
45.

Substances which relieve body pains are termed as

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ANTIPYRETICS
antibiotics
analgesics
ANTIMALARIALS

ANSWER :C
46.

Substances which have identical chemical properties but differ in atomic weights are called

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Isothermals
ISOTOPES
Isentropus
Elementary particles

Solution :The DEFINITION of Isotopes
47.

Substances which are repelled by the external magnetic field are called

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DIAMAGNETIC
PARAMAGNETIC
FERROMAGNETIC
ANTIFERROMAGNETIC

ANSWER :A
48.

Substances which do not react with cold water but react with steam are :

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`C` ,` CA` , `SO_2`
`FE` , `Al` , `Cl_2`
`CO_2` , `Na` , `MG`
`CO` , `Fe` , `Mn`

Answer :B
49.

Substances which bring down the body temperature during fever are known as

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ANTIBIOTICS
analgesics
antipyretics
ANTIMALARIAL

ANSWER :C
50.

Substances used in bringing down the body temperature in high fevers are called:

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SOLUTION :ANTIPYRETIC