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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. |
Molecules whose mirror image is non-superimposable over them are known as chiral. Which of the following molecules is chiral in nature?A. 2-BromobutaneB. 1-BromobutaneC. 2-BromopropaneD. 2-Bromopropane-2-ol |
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Answer» Correct Answer - A It is the correct answer. ltBrgt `CH_(3)-underset(Br)underset(|)(overset(*)(C)H-C_(2)H_(5)`. |
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| 702. |
`(CH_(3))_(3)-C-MgCl` on reaction with `D_(2)O` producesA. `(CH_(3))_(3) CD`B. `(CH_(3))_(3) COD`C. `(CD_(3))_(3) CD`D. `(CD_(3))_(3)COD` |
| Answer» Correct Answer - 1 | |
| 703. |
Assertion: `CH_(3)CHClCH_(2)CH_(3)underset("acetone")overset(NaI" in")toA` racemic mixture. Reason: The reaction invovles Walden Inversion and the product is a mixture of dextro and laevo isomers.A. If both assertion and reason are correct and reason is correct explanation for assertionB. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. if both assertion and reason are incorrect. |
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Answer» Correct Answer - A Reason is the correct explanation for assertion. |
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| 704. |
(A) Nucleophilic substitution reaction on an optically active halide gives a mixture of enantiomers. (R) Reaction should be in accordance with `S_(N^(1))` mechanism.A. If both (A) and (R) are correct and (R) is the correct explanation of (A)B. If both (A) and (R) are correct but (R) is not the correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - A | |
| 705. |
(A) Optically active 2-iodobutane on treatment with NaI in acetone undergoes recemization. (R) Reaction imvolves multiple Walden inversion and the product contains mixture of dextro and laevo isomer.A. If both (A) and (R) are correct and (R) is the correct explanation of (A)B. If both (A) and (R) are correct but (R) is not the correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - A | |
| 706. |
Compound which rotates the plane polarised light is known as optically active compound . On the basis of direction of rotation two forms of an optically active compounds are termed as dextro and laevo rotatory . The two are termed as enantiomers . If we have a 1 : 1 mixture of d and l isomers of a given chiral compound , optical rotation of such mixture is zero Such a mixture is optically inactive and is called a recemic modification. The net specific rotation of any mixture of the d and isomers of a given chiral compound is equal to the weighted average of the rotations due to both the isomers Mathematically if can be expressed as : `[alpha]_(net) =f_(d) [alpha_(d)] + f_(1) [alpha_(l)]` Where `f_(a)` and `f_(l)` are fractions of d and l isomers respectively and `[alpha_(d)] , [alpha_(l)]` are their specific rotations Which of the following molecule can resolved into enantiomers ?A. B. C. D. All of these |
| Answer» Correct Answer - 2 | |
| 707. |
Compound which rotates the plane polarised light is known as optically active compound . On the basis of direction of rotation two forms of an optically active compounds are termed as dextro and laevo rotatory . The two are termed as enantiomers . If we have a 1 : 1 mixture of d and l isomers of a given chiral compound , optical rotation of such mixture is zero Such a mixture is optically inactive and is called a recemic modification. The net specific rotation of any mixture of the d and isomers of a given chiral compound is equal to the weighted average of the rotations due to both the isomers Mathematically if can be expressed as : `[alpha]_(net) =f_(d) [alpha_(d)] + f_(1) [alpha_(l)]` Where `f_(a)` and `f_(l)` are fractions of d and l isomers respectively and `[alpha_(d)] , [alpha_(l)]` are their specific rotations What is the enantiomeric excess in any pure sample of an optically active substance ?A. 0.5B. 1C. 0D. Depends upon the specific rotation |
| Answer» Correct Answer - `2` | |
| 708. |
Compound which rotates the plane polarised light is known as optically active compound . On the basis of direction of rotation two forms of an optically active compounds are termed as dextro and laevo rotatory . The two are termed as enantiomers . If we have a 1 : 1 mixture of d and l isomers of a given chiral compound , optical rotation of such mixture is zero Such a mixture is optically inactive and is called a recemic modification. The net specific rotation of any mixture of the d and isomers of a given chiral compound is equal to the weighted average of the rotations due to both the isomers Mathematically if can be expressed as : `[alpha]_(net) =f_(d) [alpha_(d)] + f_(1) [alpha_(l)]` Where `f_(a)` and `f_(l)` are fractions of d and l isomers respectively and `[alpha_(d)] , [alpha_(l)]` are their specific rotations The pure of isomer of certain chiral compound has `[alpha]_(d)^(25) =+ 55^(@) .A` non racemic mixture of this compound has a net `[alpha]_(d)^(25) =- 11^(@) .` What is the fractions of this isomer in mixture ?A. 0. 40B. 0.6C. 0.3D. 0. 70 |
| Answer» Correct Answer - 1 | |
| 709. |
Compounds which rotate plane of plane polarised light in clockwise direction are knownasA. dextro rotatoryB. leave rotatoryC. recemic mixtureD. optical in active |
| Answer» Correct Answer - A | |
| 710. |
which compounds among the following gives a positive iodoform test ?A. EthanolB. EthanalC. 1-ButanolD. 2-Butanol |
| Answer» Correct Answer - A::B::D | |
| 711. |
Which of the following compounds will give iodoform test with `I_(2)//NaOH`A. `CH_(3)-overset(O)overset(||)C-H`B. `CH_(3)-overset(O)overset(||)C-CH_(3)`C. `C_(2)H_(5)-overset(O)overset(||)C-H`D. `CH_(3)-overset(O)overset(||)C-C_(2)H_(5)` |
| Answer» Correct Answer - A::B::D | |
| 712. |
The hydrolysis of optically active 2-bromobutane with aqueous NaOH result in the formation of :A. (-) butan -2-oIB. `(+-)` butan-2-oIC. (+) butan-2-oID. `(+-)` butan-1-oI |
| Answer» Correct Answer - B | |
| 713. |
Among the halogens the one which is oxidised by nitric acid is :A. iodineB. chlorineC. bromineD. fluorine |
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Answer» Correct Answer - A `I_(2) - 10HNO_(3) to 2HIO_(3) + 10NO_(2) + 4H_(2)O` |
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| 714. |
A primary alkyl halide would prefer to undergo :-A. `S_(N)1` reactionB. `S_(N)2` reactionC. `alpha`-eliminationD. racemisation |
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Answer» Correct Answer - B A primary alkyl halide would prefer to undergo `S_(N)2` reaction. (a) `S_(N)2` reactions occur only if the intermediate carbocation is stable i.e., `3^(@)` carbocation. (b) `S_(N)2` reactions occur if there is less steric hinderance on to the `alpha`-carbon of alkyl halide. In case of primary alkyl halides, carbocation is highly unstable and steric hinderance is very less, Sa, primary alkyl halide would prefer to undergo `S_(N)2` reaction. (c) In `alpha`-elimination, proton and the leaving group are present on same atom. (d) Racemisation is the process of conversion of enantiomer into a racemic mixture. |
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| 715. |
Dehydrohalogenation and acidcatalyzed dehydration reactions are frequently used to propare alkenes from corresponding alkylhalides and alcohols . Out of the given substrates which can be used to prepare styrene ?A. B. C. D. |
| Answer» Correct Answer - (1,2,4) | |
| 716. |
In which of the following pairs both membes on heating with alc. KOH result in the formation of same alkene as major product?A. `(CH_(3))_(3)C-Br(CH_(3))_(2)CHCH_(2)Br`B. n-Propyl idodie , isopropyl iodideC. `(CH_(3))_(2)CH-overset(Br)overset(|)underset(CH_(3))underset(|)C-CH_(2)CH_(3),(CH_(3))_(2)overset(Br)overset(|)C-underset(CH_(3))underset(|)(CH)-C_(2)H_(5)`D. All of above |
| Answer» Correct Answer - D | |
| 717. |
Dehydrohalogenation by strong base is slowest in :A. B. C. |
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Answer» Correct Answer - C Compound (C) has all equitorial substituent hence it is most stable and undergo elimination with slowest state. |
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| 718. |
Only two isomeric monochloro derivative are possible forA. n-hexaneB. 2-methyl propaneC. n-heptaneD. 2-methyl butane |
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Answer» Correct Answer - B 2-methyl propane `(CH_(3)) CHCH_(3)` have 2 types of hydrogen i.e, primary and secondary of hydrogen on chlorination give s2 products by replacement of primary and tertiary hydrogen atoms. 1 `(CH_(3))CHCH_(2)Cl`- isobutyl chloride 2. `(CH_(3))_(3) C Cl` t-butyl choride |
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| 719. |
Among the isomeric alkanes formula `C_(5)H_(12)`, identify the one that on photochemical chlorination yields only monochloro derivative. |
| Answer» `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(3)`. | |
| 720. |
Which of the following is maximum reactive towards Lucas reagent? `CH_(2)=CH-CH_(2)OH,CH_(3)-underset(OH)underset(|)(C)H-CH_(3),CH_(3)-CH_(2)-CH_(2)OH` |
| Answer» Correct Answer - `CH_(2)=CHCH_(2)OH` | |
| 721. |
Which one is the most reactive towards `S_(N)1` reaction ?A. `Ph- CH_(2) -Br`B. `Ph- underset(Ph)underset(|) (CH) -Br`C. `Ph - underset(CH_(3))underset(|)(CH) - Br`D. `Ph- overset(CH)overset(|)underset(Ph)underset(|)(C )-Br` |
| Answer» Correct Answer - 4 | |
| 722. |
Which one is most reactive towards `S_(N^(1))` reaction?A. `C_(6)H_(5)CH_(2)Br`B. `C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br`C. `C_(6)H_(5)CH(CH_(3))Br`D. `C_(6)H_(5)CH(C_(6)H_(5))Br` |
| Answer» Correct Answer - B | |
| 723. |
Out of `CH_(3)_underset(C H_(3))underset(|)(C)H-CH_(2)-Cl and CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)H-Cl` which in more reactive towards `S_(N^(1)) ` reaction and why? |
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Answer» `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)H-Cl` is more reactive. Because secondary carbocation formed in the slow step is more stable as compared to the primary carbocation in the other reaction. |
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| 724. |
an optically active compouns isA. 1-bromobutane acidB. `beta` bromobutyric acidC. 2-bromo-2-methylpropaneD. 1-bromo-2-methylpropane |
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Answer» Correct Answer - B (a) `CH_(3)CH_(2)CH_(2)CH_(2)Br` (b) `CH_(3)-CH_(2)- overset(**) CHBr-COOH` (c) `(CH_(3))_(3)CBr` (d) `CH_(3)-CH(CH_(3))-CH_(2)Br` The compound (b) has one asymmetric carbon atom, therefore, it has non-sugar imposable mirror-images and shows optical activity. |
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| 725. |
If a compounds has n chical centres and compound is unsymmetric then possible number of steroisomers (or optical isomers) isA. `2^(n)`B. `2^(n+1)`C. `2sqrt(n)`D. `sqrt(2n)` |
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Answer» Correct Answer - A For compounds and show containing three chiral centres, there could be eight optical isomers, for compounds containing four chira centres, there could be 16 optical isomers and so on. Hence the maximum number of optical isomers that can exist is equal `2^(n)`. In any case where meso compounds exist, there will be fewer optical isomers than this maximum number. |
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| 726. |
The reaction of phenylacetylene with one equivalent of methyl magnesium bromide followed by reaction with benzaldehyde providesA. B. C. D. |
| Answer» Correct Answer - 2 | |
| 727. |
The two compounds shown in the figure below are A. EnantiomersB. DiastereomersC. EpimersD. Regioisomers |
| Answer» Correct Answer - 2 | |
| 728. |
How many chiral carbons are present in following structure ? A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - 3 | |
| 729. |
Which of the following can be used to prepare 3-bromo propene ?A. `CH_(3)CH =CH_(2) +Br_(2) overset( C CI_(4)) underset(30^(@)C)(to)`B. `CH_(3)CH=CH_(2)+ N - " bromo succinimide " to `C. `CH_(2) =CH -CH_(3) +PBr_(3) to`D. CH_(2) =CH -CH_(3) overset(HBr)(to)` |
| Answer» Correct Answer - 2 | |
| 730. |
Among the following compounds the decreasing order of reactivity towards electrophilic substitution reaction is A. `1gt2gt3gt4`B. `4gt3gt2gt1`C. `3gt2gt1gt4`D. `3gt1gt2gt4` |
| Answer» Correct Answer - D | |
| 731. |
Ethyl bromide reacts with lead -sodium alloy to fromA. tetraethyl leadB. tetraethyl lead bromideC. both (a) and (b)D. none of the above |
| Answer» Correct Answer - A | |
| 732. |
Which one of the following halogen compounds is difficult to be hydrolysed by `S_(N^(1))` mechanism?A. ter-Butyl chlorideB. Isopropyl chlorideC. Benzyl chlorideD. Chlorobenzene |
| Answer» Correct Answer - D | |
| 733. |
The formula of freon -12 is :A. `C CIF_(3)`B. `CH_(2)CI_(2)`C. `C CI_(2)F_(2)`D. `CH_(2)F_(2)` |
| Answer» Correct Answer - C | |
| 734. |
Freon -12 is manufactured from tetrachloromethane by ,A. Wurtz reactionB. Swarts reactionC. Fitting reactionD. Wurtz -Fitting reaction |
| Answer» Correct Answer - B | |
| 735. |
Which of the following is known as freon 12 ?A. `CHCI_(3)`B. `C CI_(2)F_(2)`C. `Ph-COCH_(2)CI`D. `Ph -CI` |
| Answer» Correct Answer - 2 | |
| 736. |
` ( R )` -2-Iodobutane is treated with Nal in acetone and allowed to stand for a long time The product eventually fromed is .A. (R ) -2- lodobutaneB. S-2- lodobutaneC. `(+-) -2-` lodobutaneD. 2-Butane |
| Answer» Correct Answer - 2 | |
| 737. |
The reaction goes throughA. `S_(N)1`B. `S_(N)2`C. `E_(2)`D. `E_(1)` |
| Answer» Correct Answer - 2 | |
| 738. |
Which of the following solvent is suitable for `S_(N)1` reaction ?A. Non- polarB. Polar proticC. Polar aproticD. all of these |
| Answer» Correct Answer - 2 | |
| 739. |
The synthesis of alkyl fluoride is best accomplished by:A. Free radical fluorinationB. Sandmeyers reactionC. Finkelstein reactionD. Swart reaction |
| Answer» Correct Answer - D | |
| 740. |
During conversion of isopropyl alcohol to isopropyl iodid which of the following is not usedA. `NaI//H_(3)PO_(4)`B. `KI// H_(3)PO_(4)`C. `MaI+H_(2)SO_(4)`D. HI |
| Answer» Correct Answer - C | |
| 741. |
During conversion of alcohol to monoiodo alkane which of the following is usedA. alc. NalB. `NaI//H_(3)PO_(4)`C. NaI in etherD. `NaI "in" H_(2)O` |
| Answer» Correct Answer - B | |
| 742. |
In a `S_(N)2` substitution reaction of the type `R-Br+Cl^(-) overset("DMF")toR-Cl+Br^(+)` which one of the following has the highest relative rate?A. `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-Br`B. `CH_(3)-CH_(2)-Br`C. `CH_(3)-CH_(2)-CH_(2)-Br`.D. `CH_(3)-underset(CH_(3))underset(|)(C)H-CH_(2)-Br`. |
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Answer» Correct Answer - B The compound is primary alkyl halide with the smallest alkyl group. The bond cleavage is the easiest. |
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| 743. |
For a typical nucleophilic aromatic substitution reaction to take place . 1. Nucleophilic atom should be of oxygen nitrogen or sulphur. 2. Leaving groups should be halide. 3. There should be strong electron withdrawing at ortho and para position to leaving group. Fastest nucleophilic aromatic substitution reaction take place in :A. B. C. D. |
| Answer» Correct Answer - A | |
| 744. |
(A) 2- Bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as a major product. (R) 1-Butene is less stable than 2-butene.A. If both (A) and (R) are correct and (R) is the correct explanation of (A)B. If both (A) and (R) are correct but (R) is not the correct explanation of (A)C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - D | |
| 745. |
The number of isomers obtained on monochlorination of propaneA. 4B. 3C. 2D. 1 |
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Answer» Correct Answer - C Propane has two types of hydrogen atom i.,e `1^(@)` hydrogen and `2^(@)` hydrogen. Hence it gives two isomeric product on chlorination i.e., chloropropane and 2-chloropropane. |
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| 746. |
Major product formed when toluene on monochlorination.A. B. C. D. |
| Answer» Correct Answer - C | |
| 747. |
Arrange the given alkylhalides in the increasing reactivity towards Nucleophilic substitution reactions A. `A gt B gt D gt C`B. `A gt C gt B gt D`C. `B gt C gt A gt D `D. `D gt A gt C gt B` |
| Answer» Correct Answer - 3 | |
| 748. |
What would be the major product of the given reaction ? A. B. C. D. |
| Answer» Correct Answer - 1 | |
| 749. |
Two osomers given below are `(i) {:(" COOH"), (" |"),(" H"-C-OH),(" |"),(HO-C-H),(" |"),(" COOH"):}" "(ii) {:(" HOOC"), (" |"),(HO-C-H),(" |"),(H-C-OH),(" |"),(" HOOC"):}`A. enatiomersB. mesomersC. diastereoisomersD. position isomers |
| Answer» Correct Answer - A | |
| 750. |
Which of the following compounds can exhibits both geometrical and optical isomerims?A. B. C. D. all of these |
| Answer» Correct Answer - B | |