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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 701. |
Assertion : Carbon-oxygen bonds are of equal length in carbonate ion. Reason : Bond length decreases with the multiplicity of bond between two atoms.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertion.C. If assertion is true of the reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - B `CO_(3)^(2-)` shows resonance and thus all the three bonds are of indentical bond length. `O=underset(O_(-))underset(|)(C)-O^(-)harrO^(-)-underset(O_(-))underset(|)(C)=O harrO^(-) - underset(O)underset(||)(C)-O^(-)` |
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| 702. |
The IUPAC name of the given compound A. 5,6-Diethyl-3methyl-4deceneB. 7-Methyl-hepteneC. 6-Methyl hepteneD. 3,3-Diethyl-5-ethyl-4-decene |
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Answer» Correct Answer - A |
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| 703. |
The IUPAC name of the compound A. Bicyclo [2, 1, 0] pentaneB. 1, 2-Cyclopropy cyclobutaneC. Cyclopentane [4, 3] annuleneD. 1, 2-Dimethylene cyclobutane |
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Answer» Correct Answer - A |
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| 704. |
Main source of most of the organic compounds isA. Coal tarB. PetroleumC. Both 1 & 2D. Ammonia |
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Answer» Correct Answer - C |
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| 705. |
The migratory capacity isA. `H^(-) gt CH_(3)^(-) gt Ph^(-)`B. `Ph^(-) gt CH_(3)^(-) gt H^(-)`C. `H^(-) gt Ph^(-) gt CH_(3)^(-)`D. `CH_(3)^(-) gt Ph^(-) gt H^(-)` |
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Answer» Correct Answer - B The migratory capacity is maximum if the negative charge is on a more electronegative atom. In `Ph^(-)`, the -ve charge is on a `sp^(2)` carbon. In `overset(-)(C)H(3)`, the -ve charge is on a `sp^(3)` carbon atom. Out of carbon and hydrogen, carbon is more electronegative. Further an `sp^(2)C` atom is more electronegative than `sp^(3)C` atom. Hence migratory capacity of `Ph^(-) gt overset(-)(C)H_(3) gt H^(-)`. So answer (b) is correct whereas (a), (c) and (d) are incorrect. |
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| 706. |
Maximum bond energy of C-H bonds is found in the compoundA. EthaneB. EtheneC. EthyneD. Equal in all the three |
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Answer» Correct Answer - C Bond energy is maximum for triple bond. |
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| 707. |
Which of the following has minimum C - H bond lengthA. `C_(2)H_(4)`B. `C_(2)H_(2)`C. `C_(2)H_(2)`D. `C_(6)H_(6)` |
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Answer» Correct Answer - B |
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| 708. |
Number of unhybridised orbitals in vinyl acetylene areA. 2B. 3C. 4D. 6 |
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Answer» Correct Answer - D Vinyl acetylene there are 6 unhybridised orbitals. `underset("(No. of unhybridis orbitals)")(underset(1)underset(sp^(2))(CH_(2))=underset(1)underset(sp^(2))(CH)-underset(2)underset(sp)(C)-=underset(2)underset(sp)(CH))` |
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| 709. |
The ratio of mass percent of C and H of an organic compound `(C_(X)H_(Y)O_(Z))` is 6 : 1. If one molecule of the above compound `(C_(X)H_(Y)O_(Z))` contains half as much oxygen as required to burn one molecule of compound `C_(X)H_(Y)` completely to `CO_(2)` and `H_(2)O`. The empirical formula of compound `C_(X)H_(Y)O_(Z)` isA. `C_(2)H_(4)O`B. `C_(3)H_(4)O_(2)`C. `C_(2)H_(4)O_(3)`D. `C_(3)H_(6)O_(3)` |
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Answer» Correct Answer - C `{:("Element",,C:H),("Mass ratio",,6:1),("Mole ratio",,6//12:1 rArr = 1:2):}` So `C_(X) H_(Y)` have empirical formula : `CH_(2)` For Burning a `CH_(2)` unit, oxygen required `1 (3)/(2)` mol `CH_(2)+(3)/(2)O_(2) rarr CO_(2) + H_(2)O` Empirical formula is `2 xx (CH_(2)O_(3//2)) rArr C_(2)H_(4)O_(3)`. |
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| 710. |
Which of the following are the resonating structure of `CH_(2)=CH-underset(H)underset(|)(C)=O`A. `CH_(2)=CH-underset(H)underset(|)overset(o+)(C)-overset(Θ)(O)`B. `CH_(2)=CH-underset(H)underset(|)overset(Θ)(C)-underset(..)overset(o+)(O):`C. `overset(o+)(C)H_(2)-CH=underset(H)underset(|)(C)-overset(Θ)(O)`D. `overset(delta+)(CH_(2))overset(...)(-)CHoverset(...)(-)underset(H)underset(|)(C)overset(...)(-)overset(delta-)(O)` |
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Answer» Correct Answer - A::C::D For a structure to be a resonating or contributing structure. (i) Placement of atoms should not change. (ii) Atoms like carbon cannot have more than eight electrons in their valence shell. (iii) It is better to have negative charge on a more electronegative atom. (iv) The shared electrons would move only towards more electronegative atom. In choice (b) points (iii) and (iv) are violated. Hence it is not a resonating structure. In (a), all the points are followed, so it is a resonating structure. In (c), all the points are followed, so it is resonating structure. In (d), all the points are followed, so it is resonating structure. |
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| 711. |
Which of the following salts is the most basic in aqueous solution?A. `CH_(3)COOK`B. `FeCl_(3)`C. `Pb(CH_(3)COO)_(2)`D. `Al(CN)_(3)` |
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Answer» Correct Answer - A Most basic salt in aq. Solution is `CH_(3)COOK` it is salt of WASB and have `PH = 7+((P_(ka)+log C))/(2)` i.e., `pH gt 7` |
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| 712. |
Hybridisation in `CH_(3), overset(+)(C)H_(3) and overset(-)CH_(3)` are respectivelyA. sp and `sp^(2)` respectivelyB. `sp^(2)` and `sp^(2)` respectivelyC. `sp^(2)` and `sp^(3)` respectivelyD. `sp^(3)` and `sp^(3)` respectively |
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Answer» Correct Answer - C Carbocation have planar geometry (`sp^(2)` hybridisation) and carbanions have pyramidal geometry (`sp^(3)` hybridisation). |
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| 713. |
`CH_(2)=C=CH_(2)`. Hybridisation of central carbon isA. spB. `sp^(2)`C. `sp^(3)`D. `sp^(3)d` |
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Answer» Correct Answer - A |
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| 714. |
Hybridisation at 2nd carbon in `CH_(2)=CH-CH_(3)` isA. spB. `sp^(2)`C. `sp^(3)`D. `sp^(3)d` |
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Answer» Correct Answer - B |
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| 715. |
Which of the following has minimum C - H bond lengthA. `C_(2)H_(4)`B. `C_(2)H_(2)`C. `C_(2)H_(6)`D. `C_(6)H_(6)` |
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Answer» Correct Answer - C |
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| 716. |
Which of the following compounds are more basic than A. `CH_(3)-CH_(2)-overset(* *)NH_(2)`B. `CH_(3)-overset(NH)overset(||)C-NH_(2)`C. D. `CH_(2)=CH-overset(* *)NH_(2)` |
| Answer» Correct Answer - A::B::D | |
| 717. |
Which of the following aromatic rings have greater electron density than A. B. C. D. |
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Answer» Correct Answer - A::C::D a has +M group, c and d have more no.of`prop-H` |
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| 718. |
Which of the following ions will be armoatic in nature?A. B. C. D. |
| Answer» Correct Answer - A::C | |
| 719. |
Examine the following two structures for the anilinium ion and choose the correct statement from the ones gives below: A. II is not an acceptable resonating structure because carbocation is less stable than ammonium ionB. II is not acceptable structure becauce it is non aromaticC. II is not is acceptable resonating structureD. II is not acceptable resonating sturcture |
| Answer» Correct Answer - A::C::D | |
| 720. |
Find out number of benzylic hydrogen in |
| Answer» Correct Answer - 5 | |
| 721. |
Which of the following alkenes are more stable than A. B. C. D. |
| Answer» Correct Answer - A::B::C::D | |
| 722. |
Which of the following alkenes is the most stable on account of maximum hyperconjugation?A. `(CH_(3))_(3)C CH=CH_(2)`B. `CH_(3)CH=CH_(2)`C. `(CH_(3))_(2)CHCH=CH_(2)`D. `CH_(3)CH_(2)CH=CH_(2)` |
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Answer» Correct Answer - B The correct order of decreasing hyperconjugation effect is `CH_(3)CH=CH_(2) gt CH_(3)CH_(2)CH=CH_(2) gt (CH_(3))_(2)CHCH=CH_(2) gt (CH_(3))_(3)C CH=CH_(2)` |
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| 723. |
Which of the following will give effervesce of `CO_(2)` with `NaHCO_(3)`A. B. C. D. |
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Answer» Correct Answer - C Squaric acid is more acedic than `H_(2)CO_(3)` |
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| 724. |
Which of the following compound will react with `NaHCO_(3)` or soluble in `NaHCO_(3)` ? |
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Answer» Correct Answer - 2 (c,d) Benzoic acid and Benzene Sulphonic are more compounds than `H_(2)CO_(3)` So these are capable to react with `NaHCO_(3)` to give a salt and `CO_(2)` gas. |
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| 725. |
The reaction , is fastest when X isA. ClB. `NH_(2)`C. `OC_(2)H_(5)`D. OCOR |
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Answer» Correct Answer - A Conjugate acid of `Cl^(-)` is a stronger acid i.e., HCl. |
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| 726. |
Which one of the following compounds can be deprotonated by OH fastest ?A. `HCOOH, pK_(a)=3.8`B. `H_(2)S, pK_(a)=7.0`C. Toluence , `pK_(a)` =41D. `CH_(3)NH_(2), pK_(a)=40` |
| Answer» Correct Answer - A | |
| 727. |
Which is the strongest acid in 2 ?A. AB. BC. CD. D |
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Answer» Correct Answer - d Acidic strength `prop-I, -M, -H` groups on acidic centre. Basic strength `prop+1 , +M,+H` groups on basic centre. |
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| 728. |
Which is weakest acid in 2 ?A. AB. BC. CD. D |
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Answer» Correct Answer - b Acidic strength `prop-I, -M, -H` groups on acidic centre. Basic strength `prop+1 , +M,+H` groups on basic centre. |
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| 729. |
Energy required for the excitation of carbon atom isA. 501.6 KJ/molB. 827.0 KJ/molC. 341.0 KJ/molD. 610.0 KJ/mol |
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Answer» Correct Answer - A |
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| 730. |
Marsh gas mainly contains:A. `C_(2)H_(4)`B. `C_(2)H_(4)`C. `CH_(4)`D. `C_(2)H_(6)` |
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Answer» Correct Answer - C |
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| 731. |
The possible structure (s) of monnthio-carbonate ion is :A. B. C. D. |
| Answer» Correct Answer - D | |
| 732. |
How many degrees of unsatruration are there the following compound ? A. 6B. 7C. 10D. 11 |
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Answer» Correct Answer - D Dgree of unsturartion `=(C+1)-((H+X-N)/(2))` |
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| 733. |
The decreasing order of bond length of `C=C` bond in the following compounds is : A. `IIgtIgtIVgtIII`B. `IIIgtIgtIIgtIV`C. `IVgtIIgtIgtIII`D. `IVgtIgtIIgtIII` |
| Answer» Correct Answer - B | |
| 734. |
The carboxylic acid wich has maximum solubility in water is :A. Phthalic acidB. succinic acidC. molanic acidD. salicylic acid |
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Answer» Correct Answer - C With the increas in hydrocarbon portion sulubility in `H_(2)O` decreases. |
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| 735. |
Which of the following is not correct decreasing `k_(a)` order .A. `CH_(4) gt NH_(3) gt H_(2)O gt HF`B. `CH_(3) -OH gt CH_(3)-NH_(2) gt CH_(3)-Fgt CH_(3)-CH_(3)`C. `Hl gt HBr gt HCl gt HF`D. `PhOH gt H_(2)O gt C_(2)H_(5)OH gt CH_(3)-C-=CH` |
| Answer» Correct Answer - A | |
| 736. |
The gases produced in the following reactions are respectively `I: CH_(3)NH_(2) + NH_(2)Br to ` `II: CH_(3)SO_(3)H + NaHCO_(3) to ` `III: Ch_(3) -underset(O)underset(||)C -NH_(2)+NaH to`A. `NH_(3),NH_(3), CO_(2)`B. `NH_(3), SO_(2), H_(2)`C. `NH_(3), CO_(2), H_(2)`D. `NH_(3), SO_(2), NH_(3)` |
| Answer» Correct Answer - D | |
| 737. |
Which of the following stability order of anions is/are correct :A. B. C. D. `underset(I)overset(Ө)(CH_(3)) gt overset(Ө)Cunderset(II)(D_(3))" "I gt II` |
| Answer» Correct Answer - A::B::C::D | |
| 738. |
Which of the following acid has the smallest dissociation constant ?A. `CH_(3)-underset(NO_(2))underset(|)CH-C"OO"H`B. `O_(2)N-CH_(2)-CH_(2)_C"OO"H`C. `Cl-CH_(2)-CH_(2)-COOH`D. `NC-CH_(2)-CH_(2)-C"OO"H` |
| Answer» Correct Answer - C | |
| 739. |
Total number of stereoisomer of compound `CH_(3)-CH=CH-underset(CH_(3))underset(|)CH-CH=CH-CH_(3)`A. 2B. 4C. 6D. 8 |
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Answer» Correct Answer - B Two optically active and two optically inactive |
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| 740. |
The eholic form of acetone contains :A. `9 sigma` bonds, `1 pi` bond and 1 lone pairsB. `8 sigma` bond, `2pi` bond and 2 lone pairsC. `10 sigma` bond, `1 pi` bond and 1 lone pairD. `9 sigma` bond, `2 pi` bond and 1 lone pair |
| Answer» Correct Answer - A | |
| 741. |
Acetone and propen-2-ol areA. enantiomersB. keto-enol tautomersC. diastereoisomersD. meso compounds |
| Answer» Correct Answer - B | |
| 742. |
Among the following the dissociation constant is highest forA. `C_(6)H_(5)OH`B. `C_(6)H_(5)CH_(2)OH`C. `CH_(3)C-=CH`D. `CH_(3)NH_(3)^(+)Cl^(-)` |
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Answer» Correct Answer - D Dissociation of proton from `CH_(3)-overset(+)(N)H_(3)Cl^(-)` is very difficult due to -I effect of `Cl^(-)` and `N^(+)` while in `C_(6)H_(5)OH` due to resonance stabilization of phenoxide ion proton eliminate easily similarly due to H-bonding in `C_(6)H_(5)CH_(2)OH` it can be eliminated and `CH_(3)C-=CH` show acidic character by triple bond by which proton can be dissociate. |
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| 743. |
The compound `C_(n)H_(2n)[n=4]` does not exhibit the which of the following isomerism?A. ChainB. GeometricalC. PositionD. Optical |
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Answer» Correct Answer - D `C_(4)H_(8)` does not exhibit optical isomerism |
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| 744. |
Which of the following statement is/are correct ?A. `(I)` and `(II)` are aromatic and have equal basic strength.B. `(I)` is aromatic and `(II)` is anti-aromatic, but `(II)` is stronger base than `(I)`C. The order of basicity of the above compounds is `(IV) gt (III) gt (II) gt (I)`.D. The conjugate acid of `(IV)` is more stabilised than the conjugate acid of `(II)`. |
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Answer» (c and d) In `IV`, lone pair of two `N` makes it more basic and does not delocalise in the benzene ring. In `III`, no delocalisation of `LP` of `overline e^, s` on `ddot N H_2` In `II`, no delocalisation of `LP` of `overline e` on `N` In `I`, delocalisation of `LP` of `overline e^, s` on `N` via resonance. Hence, the order of basic character is : `IV gt III gt II gt I`. |
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| 745. |
The order of stability of the following tautomeric compounds is : `CH_(2)=overset(OH)overset(|)C-CH_(2)-underset(I)overset(O)overset(||)C-CH_(3) hArr Ch_(3)-overset(O)overset(||)C-CH_(2)-underset(II)overset(O)overset(||)C-CH_(3) hArr CH_(3)-overset(OH)overset(|)C=CH-underset(III)overset(O)overset(||)C-CH_(3)`A. `III gt II gt I`B. `II gt I gt III`C. `II gt III gt I`D. `I gt II gt III` |
| Answer» Correct Answer - A | |
| 746. |
Which of the following is most stable conformation?A. B. C. D. |
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Answer» Correct Answer - D Conformer D is most stable due to chelation |
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| 747. |
Which of the followig represent most stablilised conformer of A. B. C. D. |
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Answer» Correct Answer - C Bulky group prefers to occupy equitorial postion |
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| 748. |
Which among the following pairs are diasteromers A. Only IIB. Only IC. I and IID. I,II and IV |
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Answer» Correct Answer - 2 C is -trans isomers are diastereomers |
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| 749. |
The decreasing order of acidic character of the following is : (I) `CH_3 SH` (II) `CH_3 OH` (III) `H_2 O` (IV) `EtOH`.A. `I gt II gt III gt IV`B. `IV gt III gt II gt I`C. `I gt III gt II gt IV`D. `III gt I gt II gt IV` |
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Answer» Correct Answer - A (a) Thiols `(RSH)` are stronger acid than alcohols Methanol `(pK_a = 15.5)` is a stronger acid than `H_2 O(pK_a = 15.7)`, but other alcohols are weaker than `H_2 O`. So `(a)` has acidic character. |
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| 750. |
The structure I nad II are A. Conformational diasteromersB. Configurational enantiomersC. Configurational diasteremersD. Identical |
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Answer» Correct Answer - B The tischer projections of I & II are non-super imposable mirror images of each other. |
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