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.	Gutta percha is
Answer» trans-Polyisoprene A SYNTHETIC POLYMER A very hard MATERIAL All STATEMENT are correct Solution :Property of Gutta percha which is polymer of ISOPRENE .

2.	Gutta -Percha and natural rubber are :
Answer» MADE up of same MONOMER GEOMETRICAL ISOMERS 1,4-addition POLYMER all of these Solution :N//A

3.	Natural rubber is a:
Answer» A TRANS 1,4-polyisoprene polymer A very HARD meterial A SYNTHETIC polymer All of the STATEMENTS are correct Answer :D

4.	Gutta parcha rubber is :
Answer» A trans 1,4-polyisoprene polymer A very hard MATERIAL A natural polymer All of these ANSWER :D

5.	Gun shots are made of lead with a little arsenic. The function of as is to increase:
Answer» RANGE of fire Power of fire Brittleness Weight of fire Answer :C

6.	Gun powder is:
Answer» `KNO_3 + CHARCOAL + S` `NaNO_3 + KNO_3` + S `NaNO_3` + S None of these Answer :A

7.	Gun-cotton is obtained when conc. Nitric acid reacts with
Answer» GLYCERINE Glycol Cellulose Starch ANSWER :C

8.	Gun-cotton is
Answer» Nitrosucrose NITROCELLULOSE Nitroglucose Nitropicrin Solution :Gun cotton is a nitrocellulose or CELLULOSE trinitrate which is used in explosives and as a BINDER for SOLID rocket propellant.

9.	Gun metal is an alloy of
Answer» Cu and AI Cu,SN and Zn Cu,Zn and Ni Cu and Sn Answer :B

10.	Gun metal is an alloy of .....
Answer» Cu and FE Cu, Sn & Zn Ni, Fe and Cr Al and Mg Solution :Cu, Sn & Zn

11.	Guanidine, (NH_2)_2 C=NH is said to be the strongest nitrogen containing organic base because
Answer» it has two `NH_2` groups it has three nitrogen atoms that can be protonated its amino GROUP is FIRST protonated its conjugate acid is very MUCH stable due to three EQUIVALENT structures Solution : Unusual stability of the conjugate acid of GUANIDINE explains why guanidine is the strongest organic known base.

12.	Gum is
Answer» disaccharide monosaccharide polysaccharide trisaccharide Answer :C

13.	gt C = O is converted into -CH_(2)- by
Answer» Clemmenson reduction `H_(2)//Ni` Mendius reduction `NaHg+H_(2)O` reaction . SOLUTION :`GT C = O + 4H overset(ZnHg + HCl) to gt CH_(2) + H_(2)O`

14.	Gums are :
Answer» POLYSACCHARIDES of more than ONE TYPE of monosaccharides USED as THICKENING agent Used for improvement of texture in food industry All Answer :D

15.	Guanine is held by three hydrogen bonds with the base :
Answer» Thymine ADENINE CYTOSINE URACIL. Answer :C

16.	Growing more trees help to :
Answer» REDUCE OXYGEN in the environment INCREASE CARBON DIOXIDE only in the environment Reduce carbon dioxide only in the environment Reduce `CO_2` and increase `O_2` in the environment Answer :D

17.	Basic structure of all Chlorophylls comprises
Answer» `-CH_3,-C_2H_5,-CH=CH_2,-COOCH_3 and -CH_2CH_2COOC_20H_39` `-CH_3,-C_2H_5, - CH = CH_2, - COCH_3 and -CH_2CH_2COOC_20H_39` `-CHO, -C_2H_5, -CH = CH_2, -COCH_3 and -CH_2CH_2COOC_20H_39` `-CHO, -C_2H_5, - CH=CH_2, - COOCH_3 and -CH_2CH_2COOC_20 H_39` ANSWER :D

18.	Group VIII of Mendeleef's periodic table contains
Answer» 6 ELEMENTS 12 elements 3 elements 9 elements Answer :D

19.	Group reagent for group-1 basic radicals is
Answer» DIL. HCL CONC. `H_2 SO_4` `HNO_3` `H_2 S`. ANSWER :A

20.	Group I filtrate is made moderately acidic before proceeding to group II. Expain.
Answer» Solution :precipitation of the sulphide can occur only when the ionic product `[M^(2+)][S^(2)]` exceeds the solubility product of the sulphides. MS In the presenc of acid, the ionisation of `H_(2)S` is suppressed due to the INCREASED concentration of `H^(o+)`. As a result, there are only few `S^(2-)` ions in solution which are enough to precipitate only group II cations as sulphides e.g., `Cus,PbS` etc. But for the precipitation of CDS, the concentration of `S^(2-)` is not enough. HENCE the concentration of `(H^(o+))` should be further decreased by diluting the solution so that the `H_(2)S` is ionised extensively As a result `S^(2-)` ions are made available in sufficient quantity which can precipitate thhe `Cd^(2+)` ions i.e., ionic product `[Cd^(2+)][S^(2-)]` exceeds solubility product of CdS.

21.	Group 15 elements are commonly known as.
Answer» Halogens Chalcogens Pnicogens Normal elements Answer :C

22.	Group 14 elements have general electronic configuration ________
Answer» `NS^(2)` `ns^(2)np^(4)` `ns^(2)np^(6)` `ns^(2)np^(2)` Answer :D

23.	Group 15 elements exhibit + 3 and + 5 oxidation states + 3 oxidation state is more stable than + 5 in case of :
Answer» N P As Bi Answer :D

24.	Group 14 elements exhibit +2 and +4 oxidation states. +2 oxidation states is more stable than +4 in case of :
Answer» C Pb Sn Si. Solution :Heaviest ELEMENT of the GROUP EXHIBIT lower OXIDATION state.

25.	Group 11 or IB elements are commonly known
Answer» COINAGE metals Transition metals Typical ELEMENTS REPRESENTATIVE elements ANSWER :A

26.	Grignared reagent on reaction with ketones forms
Answer» TERTIARY alcohol Secondary alcohol acetic ACID ACETALDEHYDE ANSWER :A

27.	Grignards reagent may be obtained by reacting Mg metal with,
Answer» ACETALDEHYDE ALKYL HALIDE ethly AMINE haloform Answer :B

28.	Grignard's reagent reacts with ethanal (acetaldehyde) and propanone to give
Answer» Higher aldehydes with ethanal and higher ketones with propanone Primary ALCOHOLS with ethanal and secondary alcohols with propanone Ethers with ethanal and alcohols with propanone Secondary alcohols with ethanal and tertiary alcohols with propanone Solution :`CH_(3)-MgBr + CH_(3)-OVERSET(O)overset(\|\|)(C )-H overset(H_(2)O)rarr CH_(3)-underset(" "CH_(3))underset(\|)(CH)-OH+MgBr(OH)` `CH_(3)MgBr + CH_(3)-underset(" "CH_(3))underset(\|)(C )=O overset(H_(2)O)rarr`

29.	Grignard's reagent is prepared by the reaction between
Answer» zinc and alkyl HALIDE magnesium and alkyl halide magnesium and ALKANE magnesium and AROMATIC hydrocarbon Answer :B

30.	Grignard regentgivesalkanewith :
Answer» `H_(2)O` `C_(2) H_(5)OH ` `C_(2) H_(5) NH_(2)` allof these ANSWER :D

31.	Grignard reagents (RMgX) are prepared by the reaction of an organic halide and magnesium metal in ether solvent. R-X+Mgoverset(R-O_R)toR-MgX The solvent (usually diethyl ether or tetrahydrofuran) plays a crucial role in the formation of a Grignard reagent. Alkyl halides are more reactive than art and vinyt halides, Indeed, aryl and vinyl halides. Indeed aryl and vinyl chlorides do not form Grignard reagents in dethyf other. However, an att ha de containing an alcoholic - OH group can be converted to Grignard reagent by graf protecting the - OH group to a tert-butytdimethytslyt ether which is not to Grignard reagent. The protecting group is finally liberated by treatment with lotion R-O-H+Cl-underset("Tert-Butylchlorodimethyilance")underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(Si)-C(CH_(3))_(3)toR-O-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3)overset((C_(4)H_(9))N^(+)F^(-))toR-O-H+F-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3) Grignard reagent can't be prepared from
Answer» ANSWER :A

32.	Grignard reagents (RMgX) are prepared by the reaction of an organic halide and magnesium metal in ether solvent. R-X+Mgoverset(R-O_R)toR-MgX The solvent (usually diethyl ether or tetrahydrofuran) plays a crucial role in the formation of a Grignard reagent. Alkyl halides are more reactive than art and vinyt halides, Indeed, aryl and vinyl halides. Indeed aryl and vinyl chlorides do not form Grignard reagents in dethyf other. However, an att ha de containing an alcoholic - OH group can be converted to Grignard reagent by graf protecting the - OH group to a tert-butytdimethytslyt ether which is not to Grignard reagent. The protecting group is finally liberated by treatment with lotion R-O-H+Cl-underset("Tert-Butylchlorodimethyilance")underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(Si)-C(CH_(3))_(3)toR-O-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3)overset((C_(4)H_(9))N^(+)F^(-))toR-O-H+F-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3) The function of tetrahydrofuran in the preparation of Grignard reagent is that it
Answer» acts as a solvent helps in MAINTAINING the reaclivity of MAGNESIUM both none of the above Answer :C

33.	Grignard reagents (RMgX) are prepared by the reaction of an organic halide and magnesium metal in ether solvent. R-X+Mgoverset(R-O_R)toR-MgX The solvent (usually diethyl ether or tetrahydrofuran) plays a crucial role in the formation of a Grignard reagent. Alkyl halides are more reactive than art and vinyt halides, Indeed, aryl and vinyl halides. Indeed aryl and vinyl chlorides do not form Grignard reagents in dethyf other. However, an att ha de containing an alcoholic - OH group can be converted to Grignard reagent by graf protecting the - OH group to a tert-butytdimethytslyt ether which is not to Grignard reagent. The protecting group is finally liberated by treatment with lotion R-O-H+Cl-underset("Tert-Butylchlorodimethyilance")underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(Si)-C(CH_(3))_(3)toR-O-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3)overset((C_(4)H_(9))N^(+)F^(-))toR-O-H+F-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3) H_(2)N(CH_(2))_(3)Br can't be converted into corresponding Grignard reagent because
Answer» reaction between `-NH_(2)andBr` GROUP present in the same molecule of STRONG nucleophilic character of the Grignard reagent of strong BASIC nuture of the Grignard reagent all of the above Answer :C

34.	Grignard reagents should be prepared under anhydrous conditions ?
Answer» Solution :Grignard reagents are very reactive. They react with moisture present in the apparatus or the staring materials, i.e., R - X and MG. `underset("Grignard reagent ") OVERSET(delta - delta + delta - ) (R - MgX + H ) - OH to R - H + Mg(OH) X ` Therefore, Grignard reagents MUST be prepared under anhydrous conditions.

35.	Grignard reagents (RMgX) are prepared by the reaction of an organic halide and magnesium metal in ether solvent. R-X+Mgoverset(R-O_R)toR-MgX The solvent (usually diethyl ether or tetrahydrofuran) plays a crucial role in the formation of a Grignard reagent. Alkyl halides are more reactive than art and vinyt halides, Indeed, aryl and vinyl halides. Indeed aryl and vinyl chlorides do not form Grignard reagents in dethyf other. However, an att ha de containing an alcoholic - OH group can be converted to Grignard reagent by graf protecting the - OH group to a tert-butytdimethytslyt ether which is not to Grignard reagent. The protecting group is finally liberated by treatment with lotion R-O-H+Cl-underset("Tert-Butylchlorodimethyilance")underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)(Si)-C(CH_(3))_(3)toR-O-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3)overset((C_(4)H_(9))N^(+)F^(-))toR-O-H+F-Si-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C(CH_(3))_(3) Griganrd reactions generally occur in dry ether because
Answer» the stronger ACID diethly ether will DISPLACE the weaker RH acid from its salt the stronger acid `H_(2)O` will displace the weaker acid RH from its salt water slows down the REACTION water mixes with ether preventing ether to PERFORM its function Answer :B

36.	Grignard reagents and organolithium compounds on addition to dry ice separately, followed by hydrolysis gives
Answer» KETONES and carboxylic acids respectively carboxylic acids and ketones respectively only carboxylic acids only ketones Solution :Grignard reagents (RMgX) react with dry ice followed by hydrolysis gives carboxylic acids. `R-MgX+O=C=Oto[R-overset(O)overset(\|\|)(C)-OMgX] underset(-Mg(OH)X)overset(H^(+)//H_(2)O)to underset("Carboxylic acids")(R-overset(O)overset(\|\|)(C)-OH)` Organolithium compounds being more nucleophilic add to C=O of addition product (I) to GIVE addition product (II) which upon SUBSEQUENT hydrolysis gives a ketone. `R-Li+O=C=Otounderset((I))([R-overset(O)overset(\|\|)(C)-Oli ]) overset(R-Li)to [R-underset(R)underset(\|)overset(O" "Li)overset(\|)(C)-OLi]overset(H^(+)//H_(2)O)to[R-underset(R)underset(\|)overset(OH)overset(\|)(C)-OH underset(-H_(2)O)to]underset("Ketone")(R-overset(O)overset(\|\|)(C)-R)`.

37.	Grignard reagents are highly reactive and react with any source of__________to give hydrocarbons.
Answer» ANSWER :PROTON

38.	Grignard reagents are prepared in
Answer» Benzene Chloroform Alcohol Ether Answer :D

39.	Grignard reagent with hydrogen cyanide gives:
Answer» ALDEHYDE Ketone Both (a) and(B) NONE ANSWER :A

40.	Grignard reagent undergoes :
Answer» NUCLEOPHILIC substitution Nucleophilic addition BOTH (A) AND (B) None Answer :C

41.	Grignard reagent, PhMgBr on treatment with ethylene oxide followed by acid hydrolysis gives
Answer» `C_6H_5CH_2CH_2OH` `PhCHOHCH_3` `C_6H_5CH_2CHO` `PhCOCH_3` SOLUTION :

42.	Grignard reagent on reaction with acetone forms
Answer» TERTIARY alcohol Secondary alcohol Acetic acid Acetaldehyde Answer :A

43.	Grignard reagent of C_(6)H_(5)Cl can be prepared in THF but not in ether. Explain why?
Answer» Solution :DUE to +R-effect of Cl, the C-Cl bond has some double bond character and hence little more difficult to break. In other WORDS,ENERGY of activation for cleavage of C-Cl bond is little higher which cannot be supplied by the low boiling point (b.p. 308 K) of ether but can be easily supplied by the little higher b.p. (340 K) of THF.

44.	Grignard reagent on addition with dry ice followed by hydrolysis gives _______.
Answer» ALDEHYDES and acids only ketones aldehydes and ketones only CARBOXYLIC acids Answer :D

45.	Grignard reagent is prepared by the reaction between :
Answer» ZINC and ALKYL halide Magnesium and alkyl halide Magnesium and alkane Magnesium and AROMATIC hydrocarbon Answer :B

46.	Grignard reagent is not prepared in aqueous medium but it is prepared in ether medium, because.
Answer» the reagent FORMS complex with water the reagent BECOMES inactive in water it is INSOLUBLE in water the reagent is highly reactive in water. SOLUTION :

47.	Grignard reagent is not prepared in aqueous medium but prepared in ether mediumbecause the reagent
Answer» REACTS with water is insouble in water is highly reactive in ETHER becomes INACTIVE in water Solution :We KNOW that Grignard reagent (R-MgX) react with water. That is why, Grignard REAGNET is not prepared in aqueous medium but prepared in equeous medium but prepared in ether medium

48.	Grignard reagent is not prepared in aqueous medium but prepared in ether medium because the reagent
Answer» REACTS with water Is INSOLUBLE in water Is HIGHLY REACTIVE in ether Becomes inactive in water Answer :A

49.	Grignard reagent is not prepared in aqueous medium but prepared in ether medium. Because
Answer» the reagent reacts with water the reagent becomes inactive in water it is insoluble in water the reagent is highly reactive in water SOLUTION :Grignard reagent is not prepared in AQUEOUS solution because the reagent produced reacts with the ACTIVE hydrogen of water to yield ALKANE.

50.	Grignard reagent gives carbonyl compounds with
Answer» ROH RCOCl RCN CO Answer :C