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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.
| 651. |
The cylindrical shape of alkynes is due toA. Three `sigma` C - C bondsB. Three `pi` C - C bondsC. Two `sigma` C - C and two `pi` C - C bondsD. One `sigma` and two `pi` C - C bonds |
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Answer» Correct Answer - D |
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| 652. |
Which of the following statement is not correct?A. Double bond is shorter than a single bondB. Sigma bond is weaker than `pi` (Pi) bondC. Double bond is stronger than hydrogen bondD. Covalent bond is stronger than hydrogen bond |
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Answer» Correct Answer - B |
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| 653. |
Toluene hasA. `6sigma - " and "3pi - " bond"`B. `9sigma - " and "3pi - " bond"`C. `9sigma - " and "6pi - " bond"`D. `15sigma - " and "3pi - " bond"` |
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Answer» Correct Answer - D |
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| 654. |
Which of the following is the least stable carbocation?A. `CH_(3)^(*)`B. `CH_(3)CH_(2)^(*)`C. `(CH_(3))_(2)CH^(*)`D. `(CH_(3))_(3)C^(*)` |
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Answer» Correct Answer - A Alkyl groups have `+1` effect. By realeasing the electron density towards the `C` atom carrying the odd `e^(-)`, they decrease its electron deficiency and stabilize the free radical. Thus, the more the number of alkyl groups attached to the `C` atom which odd `e^(-)`, the greater would be the decrease of electron defficiency and hence more stable would be the radical: `(CH_(3))_(3)C^(*) gt (CH_(3))_(2)CH_(2)^(*)gt CH_(3)` |
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| 655. |
Which of the following statements is false for isopentaneA. It has three `CH_(3)` groupsB. It has one `CH_(2)` groupC. It has one CH groupD. It has a carbon which is not bonded to hydrogen |
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Answer» Correct Answer - D `{:(CH_(3)-CH-CH_(2)-CH_(3)),(" |"),(" "CH_(3)):}` It has 3 `CH_(3)` groups, one `CH_(2)` group and one CH group. |
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| 656. |
In the reaction The hybridisation states of carbon atoms 1,2,3,4 areA. 1 and 2 `sp^(2)`, 3 and 4 `sp^(3)`B. 1 and 2 `sp^(2)`, 3 and 4 `sp`C. 1, 2, 3 and 4spD. 1,2 `sp^(3)`, 3, 4 `sp^(2)` |
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Answer» Correct Answer - A `Br-underset(sp^(2))overset(1)(CH)=underset(sp^(2))overset(2)(CH)-Br underset("Catalyst")overset(H_(2))rarrBr-underset(sp^(3))overset(3)(CH_(2))-underset(sp^(3))overset(4)(CH_(2))-Br` |
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| 657. |
Answer 12, 13 and 14 by appropriately matching the information given in the three columns of the following table. In which amongs the following aromatic product will not form?A. (I)(i)(P)B. (II)(i)(Q)C. (III)(iv)(Q)D. (IV)(ii)(Q) |
| Answer» Correct Answer - A | |
| 658. |
, The products will be:A. B. C. D. Reaction is not feasible |
| Answer» Correct Answer - B | |
| 659. |
Which of the following will accept `H^(+)` from `NH_(4)` ion.A. B. C. D. `CH_(3)-CH_(2)-NH_(2)` |
| Answer» Correct Answer - D | |
| 660. |
Observe these compound and give answer of following questions Which of the following is correct presentation of L-galactose.A. B. C. D. |
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Answer» Correct Answer - D Mirror image of D-Galactose is L-Galactose |
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| 661. |
Observe these compound and give answer of following questions. Q. Which of the following is correct presentation of L-Gulose.A. B. C. D. |
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Answer» Correct Answer - C D-Glucose and L-gulose are enantiomers. |
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| 662. |
Which of the following reactions is not feasible ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 663. |
Observe the following reaction and answer the following questions : The structure of `Q_(1)` is :A. `Ph-underset(O^(Ө))underset(|)C=CH-underset(O)underset(||)C-H`B. `Ph-underset(O^(Ө))underset(|)C=C=underset(O^(Ө))underset(|)C-H`C. `Ph-underset(O)underset(||)C-CH=underset(O^(Ө))underset(|)C-H`D. `Ph-underset(O)underset(||)-overset(Ө)(CH)-underset(O)underset(||)C-H` |
| Answer» Correct Answer - C | |
| 664. |
Answer 12, 13 and 14 by appropriately matching the information given in the three columns of the following table. Which combination will give hydrogen gas?A. (III) (iii)(P)B. (II)(ii)(R)C. (IV)(iv)(Q)D. (I)(iii)(P) |
| Answer» Correct Answer - C | |
| 665. |
The feasible reaction is :A. `CH_(3)COOH + NaCl to `B. `C_(6)H_(5)COOH+KBr to`C. D. |
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Answer» Correct Answer - D Salicylic acid is more acidic than p-phydroxy benzoic acid. |
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| 666. |
Answer 12, 13 and 14 by appropriately matching the information given in the three columns of the following table. In which product formation is not possible ?A. (I)(ii)(Q)B. (II)(i)(R)C. (III)(ii)(Q)D. (IV)(i)(S) |
| Answer» Correct Answer - D | |
| 667. |
In which of following carbocation rearragement take place with change carbon skeleton :A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-overset(o+)CH_(2)`B. `CH_(3)-CH_(2)-overset(o+)CH_(2)`C. `CH_(3)-underset(CH_(3))underset(|)CH-CH_(2)-overset(o+)CH_(2)`D. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-CH_(2)-overset(o+)CH_(2)` |
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Answer» Correct Answer - A `underset(1^(underset(-)o)-"carbocation")(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-overset(o+)CH_(2))overset("migration of -me group")to underset(3^(underset(-)o)-"carbocation (more stable)")(CH_(3)-underset(o+)overset(CH_(3))overset(|)C-CH_(2)-CH_(3))` |
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| 668. |
Carbocation which is most stableA. `CH_(3)CH_(2)^(+)`B. `CH_(3)^(+)`C. `C_(6)H_(5)CH_(2)^(+)`D. `CH_(3)CH_(2)CH_(2)^(+)` |
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Answer» Correct Answer - C Due to resonance benzyl carbonium ion is most stable. |
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| 669. |
The most stable carbanion among the following isA. B. C. D. |
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Answer» Correct Answer - D `-NO_(2)` group, being strong electron-withdrawing , disperses the -ve charge, hence stabilizes the concerned carbonion. |
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| 670. |
Which of the following is the most stable carbanion?A. `(CH_(3))_(3)C:^(-)`B. `CH_(3):^(-)`C. `CH_(3)CH_(2):^(-)`D. `(CH_(3))_(2)CH:^(-)` |
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Answer» Correct Answer - B Alkyl groups exert `+I` effect. By releasing electron density towards the negatively charged `C` atom of carbanion, they intensify its negative charge and destabilize the carbanion. Thus, the stability of carbanions decreases with the increase in the number of alkyl groups.As a result, methyl anion, `CH_(3):^(-)` having no alkyl group is the most stable. |
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| 671. |
Strongest acid isA. `HC -= CH`B. `C_(2)H_(6)`C. `C_(6)H_(6)`D. `CH_(3)OH` |
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Answer» Correct Answer - D Because hydrogen is attached with high electronegative element. |
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| 672. |
Which of the following is/are optically active?A. B. C. D. |
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Answer» Correct Answer - B::C Compound A and D have plane of symmetry |
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| 673. |
Which of the following compounds contains more than one kind of hybridized carbons?A. `CH_(3)CH_(2)CH_(2)CH_(3)`B. `CH_(3)-CH=CH-CH_(3)`C. `CH_(2)=CH-CH=CH_(2)`D. `H-C-=C-H` |
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Answer» Correct Answer - B |
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| 674. |
Which carbocation in the most stable ?A. B. C. D. |
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Answer» Correct Answer - B Stability of `C^(o+)prop` extent of conjugation |
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| 675. |
How many stereoisomers are possible for the following molecule? A. 4B. 8C. 12D. 16 |
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Answer» Correct Answer - D Four stereo centers `implies` No. of stereo isomers `=2^(4)` |
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| 676. |
Which of the following carbocations is least stable ?A. `Ph overset (oplus) CH_2`B. `overset C H = CH_2`C. `Me_2 overset (oplus) C H`D. `CH_2 = CH - overset C H_2` |
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Answer» Correct Answer - B (b) Positive charge on `sp-hybridised` `C` atom. |
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| 677. |
Which of the following shows the correct order of decreasing basic strength in benzene medium?A. `CH_(3)NH_(2)gt (CH_(3))_(3)Ngt(CH_(3))_(2)NH gt NH_(3)`B. `(CH_(3))_(2)NHgt NH_(3)gt (CH_(3))_(3)NgtCH_(3)NH_(2)`C. `(CH_(3))_(3)Ngt (CH_(3))_(2)NHgt CH_(3)NH_(2)gtNH_(3)`D. `(CH_(3))_(2)NHgt (CH_(3))_(3)N Ngt NH_(3)gt CH_(3)NH_(2)` |
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Answer» Correct Answer - C In the gas phase as well as nonpolar solvents, the basic strength of nitrogeneous bases is decided by the availability of lone pair of electrons on the `N` atom which increases with the increase in the number of electron releasing methyl groups. |
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| 678. |
Give the decreasing order of basic strength of the following : (a) `NH_3` (b) `NH_2OH` ( c) `NH_2-NH_2`. |
| Answer» `c gt a gt b(c) ddotNH_(2) -ddotNH_(2)`, twp `LP bares gt (a) ddotNH_(3)` one `Lp bar(e)s gt (b)` `[overset(..)(N)H_(2) (##KSV_ORG_P1_C04_E01_011_S01##) OH, -I` effect of OH group]` | |
| 679. |
Among the following compound which is/are optically active?A. `CH_(3)-CH=C=CH-CH_(3)`B. C. D. `H_(3)C-CH_(2)-underset(CH_(3))underset(|)(CH)-NH_(2)` |
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Answer» Correct Answer - A::B::D A,B,D has no plane of symmetry |
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| 680. |
Arrange the following in their decreasing order of acidity. (I) (III) (IV) `NH_3`.A. `III gt IV gt I gt II`B. `I gt II gt III gt IV`C. `IV gt III gt II gt I`D. `II gt III gt I gt IV` |
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Answer» Correct Answer - A (a) (III) `+ I` effect of two `Me` groups `gt (IV)` standard `(NH_3) gt (I) EWG (C = O)` group `gt (II) EWG` two `(C = O)` groups. |
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| 681. |
Order of decreasing basic stengths of haildes is:A. `F^(-)gtCl^(-)gtI^(-)gt Br^(-)`B. `F^(-)gtCl^(-)gtBr^(-)gt I^(-)`C. `I^(-)gtBr^(-)gtCl^(-)gt F^(-)`D. `I^(-)gtCl^(-)gtBr^(-)gt F^(-)` |
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Answer» Correct Answer - B Basic strength `prop(1)/("acidic sterength of conjugated acid. ")` |
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| 682. |
Which of the following is most satble?A. B. C. D. |
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Answer» Correct Answer - A dut to intra molecular hydrogen bonding. |
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| 683. |
Which of the following reactions is not exothermic ?A. `CH_(3)-CI+CH_(3)-CH_(3)rarrCH_(4)+CH_(3)-CH_(2-CI`B. `CH_(3)-CI+(CH_(3))_(3)C-HrarrCH_(4)+(CH_(3))_(3)C-CI`C. `CH_(3)-CI+CH_(2)=CH-CH_(3)rarrCH_(4)+CH_(2)=CH-CH_(2)-CI`D. `CH_(3)-CI+CH_(2)=CH_(2)rarrCH_(4)+CH_(2)=CHCI` |
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Answer» Correct Answer - D `{:(H_(2)=CH-HrarrH_(2)C=overset(*)CH),(" "uarr" " "unstable vinyl radical"),("string bond"):}` thereofore it is endothermic . |
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| 684. |
Heat of combustion of two isomer x and y are 17 kJ/mol and 12 kJ/mol respectively. From this information it may be concluded that :A. isomer x is 5 kJ/mol more stableB. isomer y is 5kJ/mol less stableC. isomer y has 5 kJ/mol more potential energyD. isomer x is 5n kJ/mol less stable |
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Answer» Correct Answer - D Stability `prop(1)/("heat of combution")` |
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| 685. |
Choose the statement that best describes given compounds .A. 1,3 4 repesent same compoundB. 1 and 3 are isomer of 2 and 4C. 1,4 are isomer of 2 and 3D. All the structure represent the same compound |
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Answer» Correct Answer - A 1,3 & 4 compounds are 3-ethyl-4methyl heptane. |
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| 686. |
Which of the following is stringest acid ?A. B. C. D. |
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Answer» Correct Answer - C Acidic strenght of acid `prop(1)/("Basic strength of conjugated base")` |
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| 687. |
Compare relative stability of the following resonating strucrtrue. A. `(i)gt(ii)gt(iii)`B. `(ii)gt(i)gt(iii)`C. `(i)gt(iii)gt(ii)`D. `(ii)gt(III)gt(i)` |
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Answer» Correct Answer - A (1) Neutral R.S. are most stable. (2) With the increase in charge separation stability of R.S. decreases. So stability ordeer is `IgtIIgtIII` |
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| 688. |
Compare relative stability of the following resonating structure. A. `pgtqgtr`B. `qgtpgtr`C. `qgtrgtp`D. `pgtrgtq` |
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Answer» Correct Answer - D (i) -ve charge on electronegative atom increases stability . (ii) `-C-=N` system is more stable than C=C=N system . So stability order is `pgtrgtq` |
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| 689. |
How many doube equbalents does amixyclilin (show below) possss? A. 5B. 6C. 7D. 9 |
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Answer» Correct Answer - D Double bond equivalent = Degree of unsaturation = No. of double bond +no. of rings |
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| 690. |
How many double bond equibalents does a compound of molecular formula `C_(6)H_(12)O_(6)` possess ? |
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Answer» Correct Answer - B Degree of unsaturation `=1" "DU=(C+1)-((H+X-N)/(2))` We ignore the oxygen in such calcualations. |
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| 691. |
Generally organic compounds areA. AmorphousB. ComplexesC. CovalentD. Electrovalent |
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Answer» Correct Answer - C |
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| 692. |
The first carbon compound prepared from its elements isA. UreaB. Acetic acidC. MethaneD. Benzene |
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Answer» Correct Answer - B |
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| 693. |
Organic compounds can be formed byA. Plants onlyB. Animals onlyC. Plants and AnimalsD. Plants, animal and can be synthesized in laboratory |
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Answer» Correct Answer - D |
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| 694. |
The IUPAC name of the given compound is : A. 4,5-Dimethyl-1-octeneB. 4,5-Dimethyl-5-octeneC. 3,4-Dimethyl-5-octeneD. 2,3-Dipropyl-2-butene |
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Answer» Correct Answer - A |
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| 695. |
Which one of the following species will be most reactive in `S_(N^(2))` reactionA. B. C. D. |
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Answer» Correct Answer - A `S_(N^(2))` is a concerted reaction, so will be favoured at least sterically hindered carbon atom or a primary carbon atom i.e., option (a). |
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| 696. |
Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, E+ (a) Chlorobenzene, 2,4-dinitrochlorobenzene, p-nitrochlorobenzene (b) Toluene, `p-H_3C–C_6H_4–NO_(2), p-O_2N–C_6H_4–NO_2`.A. `(iii) gt (ii) gt (i)`B. `(ii) gt (iii) gt (i)`C. `(i) gt (iii) gt (ii)`D. `(i) gt (ii) gt (iii)` |
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Answer» Correct Answer - C In (i), one deactivating group (-Cl) is present. In (ii), 3 deactivating groups (`2-NO_(2)` and 1-Cl) are present, and in (iii), 2 deactivating groups (`-NO_(2)` and -Cl) are present. So order is `(i) gt (iii) gt (ii)`. |
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| 697. |
Order of reactivity towards nucleophilic substitution reaction of the compounds A. `(i) gt (ii) gt (iii) gt (iv)`B. `(ii) gt (i) gt (iii) gt (iv)`C. `(iv) gt (iii) gt (ii) gt (i)`D. `(iii) gt (iv) gt (ii) gt (i)` |
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Answer» Correct Answer - C Nucleophile will preferentially attack the compound which has lower electron density. Out of the given options, (iv) has four electrons withdrawing groups and is the most preferred substrate. So, the order of `(iv) gt (iii) gt (ii) gt (i)`. |
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| 698. |
The following reaction `CH_(3)-underset(CH_(3))underset(|)overset(H)overset(|)(C)-underset(X)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)underset(underset(-H_(2)O, -KX)(KOH))overset("Alcoholic")rarr CH_(3)-underset(CH_(3))underset(|)(C)=overset(CH_(3))overset(|)(C)-CH_(3)` is an example ofA. `alpha`-eliminationB. `beta`-eliminationC. Hofmann eliminationD. None of these |
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Answer» Correct Answer - B It involves removal of hydrogen atom from a carbon adjacent `(beta)` to the one bearing the halogen `(alpha)`. So, it is a `beta`-elimination reaction in which more substituted (more stable) product is formed. Hofmann elimination gives the less substituted alkene. |
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| 699. |
The most nucleophilic nitrogen is in:A. B. C. D. |
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Answer» Correct Answer - A In option (b) lone pair of electrons on N is a part of aromaticity and in option (c) NH - group is adjacent to electron withdrawing group and in option (s) lone pair is a part of resonance. So, pyridine is most nucleophilic. |
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| 700. |
Dehydrohalogenation of an alkyl halide is:A. Nucleophilic substitution reactionB. Elimination reactionC. Both nucleophilic substitution and elimination reactionD. Rearrangement |
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Answer» Correct Answer - B Dehydrohalogenation of an alkyl halide in presence of alcoholic potash is an example of elimination reaction. `R-CH_(2)CH_(2)-Cl+underset(alc.)(KOH)overset(Delta)rarr RCH = CH_(2)+KCl + H_(2)O` |
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