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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.
| 1. |
The IUPAC name of the isomer of `CH_(3)-CH=NOH` would beA. methanamideB. 1-amino 2- propanoneC. ethanamideD. none of the above |
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Answer» Correct Answer - C `CH_(3)CONH_(2)` is the isomer of the given structure and its IUPAC name is ethanamide |
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| 2. |
How many geometrical isomers of `CH_(3)CH=CH-CH=NOH` exist?A. FiveB. TwoC. ThreeD. Four |
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Answer» Correct Answer - D Two stereo centers `implies`No. of Geometrical isomers `=2^(n)` |
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| 3. |
Which of the following is a most likely product from the reaction as shown below ? A. B. C. D. |
| Answer» Correct Answer - (b). | |
| 4. |
The number of geometrical isomers of `CH_(3)CH=CH-CH=CH-CH=CHCl` is -A. 2B. 4C. 6D. 8 |
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Answer» Correct Answer - D Compound has three double bonds with dissimilar ends. So no of isomers are eight. |
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| 5. |
The word "aromatic" through started with benzene and its derivatives only, now it signifies a large variety of organic compounds. To examine the presence of aromaticity, the following tips are useful. Ensure that your compound is cyclic. Each corner of the ring is either a double bonded atom, or must carry a negative charge or a positive charge or a hetero atom planar. You may get deceived while examining this. On the plane of the paper everything appears planar unless specially specified. Your compound should have a closed shell of (4n+2) electrons. When the closed loop contains 4n electrons, the system is rather less stable or antiaromatic. In fused ring system some of the rings give up their aromatic nature to adjacent rings in a property knwon as "annellation". Which of the following is most acidicA. B. C. D. |
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Answer» Correct Answer - A Structure (b) and (c) will also become aromatic after losng a proton, but only by annellation. The rings likely to lose a proton in these choices will not themselves become aromatic after the loss. Structure (a), however, loses a proton to attain aromatic stability, whereas structure (d) becomes antiaromatic. The ion as a whole is aromatic. Annellation causes the electron to be less available towards the five membered ring. As a result, the central ring is not much interested to lose proton. |
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| 6. |
The total number of basic groups in the following form of lysine is |
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Answer» Correct Answer - 2 `-NH_(2)` and `-COO^(Θ)` are two basic groups. |
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| 7. |
The cleavage of a covalent bond between two atoms of a reactant in organic reaction can occur inA. two waysB. three waysC. four waysD. just one way |
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Answer» Correct Answer - A A covalent bond can get cleaved either by (i) het-erolytic cleavage or by (ii) homolytic cleavage. |
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| 8. |
Which of the following electron displacement effects in covalent bonds may also be regarded as no bond resonance?A. Inductive effectB. Electromeric effectC. HyperconjugationD. Resonance effect |
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Answer» Correct Answer - C It is so called because there is no covalent bond between the `C` and `H` atoms in hyperconjugative structures. Other names given to hyperconjugation are Baker-Nathan effect and anchimeric assistance. |
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| 9. |
Which one of the following compounds will be most readily dehydrated?A. B. C. D. |
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Answer» Correct Answer - C As carbocation intermediate, more the stability of carbocation, faster the rate of dehydration. |
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| 10. |
Which of the following conformers for ethylene glycol is most stable?A. B. C. D. |
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Answer» Correct Answer - D Intramolecular H-bonding . |
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| 11. |
Pyridine is more basic than pyrrole. Which of these of following statememt explain this fact?A. In pyrrole lone pair is involved in armaticity, in pyridine lone pair is not involved in aromaticity it is free for donationB. Conjugated acid of pyridine remains aromatic but pyrrole does not remain aromatic. C. Homolytic bond fission takes place in non polar solventsD. `+M` power of pyrrolel is greater than pyridine |
| Answer» Correct Answer - A::B | |
| 12. |
(a) How many `pi` electrons does C contion? (b) How many `pi` electrons are delocalized in the ring? Explain why C is aromatic |
| Answer» Correct Answer - `(a) 16pie^(-),(b)14pie^(-)` | |
| 13. |
Which of the following benzene ring has greater electron density than TouleneA. B. C. D. |
| Answer» Correct Answer - C | |
| 14. |
Number of delocalized `e^(-)` pairs in squaric acid and dianion of squaric acid are respectively.A. `5&5`B. `5&7`C. `3&5`D. `7&7` |
| Answer» Correct Answer - A | |
| 15. |
Heterolytic bond dissociation energy of `C-Br` bond is minimum forA. `CH_(3)Br`B. `CH_(3)CH_(2)Br`C. `(CH_(3))_(2)CHBR`D. `(CH_(3))_(3)CBr` |
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Answer» Correct Answer - D This bonds dissociation energy is the amount of energy that must be supplied to convert a mole of alkyl bromide into carbocations and bromide ions: `R-Br-gt R^(+)+Br^(-)` The order of relative stability of carbocations is as follows: `3^(@) gt 2^(@) gt 1^(@) gt overset(+)CH_(3)` because the more stable the carbocation, the lesser the enrgy required to form the carbocation. |
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| 16. |
The total number of electrons present in the valance shell of the negatively charged `C` of a carbanion isA. 8B. 6C. 4D. 5 |
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Answer» Correct Answer - A In carbanions, the negatively charged `C` atom has six `e^(-)` from the three sigma bounds and two `e^(-)s` from the unshared electron pair: `R-overset(-)overset(..)underset(R)underset(|)C-R` |
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| 17. |
Which of the following properties cannot be explained on the basis hyperconjugation.A. Dipole moment of `CH_(3)-NO_(2)`B. o-p directing character of `-CH_(3)` groupC. Greater stability of `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)^(o+)`D. Meta directing character of `C Cl_(3)` group. |
| Answer» Correct Answer - A::C | |
| 18. |
Which of the following cannot exhibit hyperconjugation?A. `CH_(3)CH=CH_(2)`B. `(CH_(3))_(3)C-overset(+)(C)H_(2)`C. `(CH_(3))_(2)overset(+)CH_(2)`D. `CH_(3)CH_(2)` |
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Answer» Correct Answer - B Hyperconjugation is not possible in this cation because it does not have `C-H` bond directly attached to `C^(+)` atom. |
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| 19. |
Among the following the pair that is not a pair of metamersA. `CH_(3)OCH_(2)CH_(2)CH_(3)&CH_(3)CH_(2)OCH_(2)CH_(3)`B. `CH_(3)OCH_(2)CH_(2)CH_(3)&CH_(3)OCH_(2)(CH_(3))_(2)`C. `CH_(3)NHCH_(2)CH_(2)CH_(3)&CH_(3)NHCH_(2)CH_(3)`D. `CH_(3)COCH_(2)CH_(2)CH_(3)&CH_(3)CH_(2)COCH_(2)CH_(3) |
| Answer» Correct Answer - C | |
| 20. |
Which of the following alkenes will react fastest with `H_(2)` under catalytic hydrogenation conditionsA. B. C. D. |
| Answer» Correct Answer - A | |
| 21. |
Correct order of acidity is:A. `PgtQgtSgtR`B. `QgtRgtSgtP`C. `QgtPgtRgtS`D. `RgtPgtQgtS` |
| Answer» Correct Answer - C | |
| 22. |
`rArr` Arrange the following compounds in deereasing order of acidity (Question No.118-125). `CH_(3)CH_(2)underset((P))CH_(2)-COOH,CH_(3)CH_(2)underset((Q))underset(Br)underset(|)CH-COOH,underset(Cl)underset(|)CH_(2)-CH_(2)-COOH,` `CH_(3)-CH_(2)underset((S))underset(Cl)underset(|)overset(Cl)overset(|)C-COOH:`A. `PgtQgtRgtS`B. `QgtRgtSgtP`C. `SgtQgtRgtP`D. `SgtRgtQgtP` |
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Answer» Correct Answer - C `-I` power increases acidity. |
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| 23. |
For which of the following parameters the structural isomers `C_(2)H_(5)OH` and `CH_(3)OCH_(3)` would be expected to have the same values (Assume ideal behaviour)A. Boiling pointsB. Vapour pressure at the same temperatureC. Heat of vaporizationD. Gaseous densities at the same temperature and pressure |
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Answer» Correct Answer - D Gaseous density of both ethanol and dimethyl ether would be same under identical condition of temperature and pressure while the rest of these three properties vapour, boiling point and heat of vaporization will differ as ethanol has hydrogen bonding whereas ethers does not. |
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| 24. |
`C_(6)H_(5)underset((P))CH_(2)OH_(2),C_(6)H_(5)underset((Q))COOH,C_(6)H_(5)underset((R))OCH_(3),C_(6)H_(5)underset((S))OH:`A. `QgtSgtPgtR`B. `PgtQgtRgtS`C. `QgtPgtSgtR`D. `RgtQgtSgtP` |
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Answer» Correct Answer - A Carboxylic acid is more acidic than alcohols. |
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| 25. |
The IUPAC name the compound `CH_(3)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH)-underset(OH)underset(|)(CH_(2))` isA. Butane -2, 3, 4-triolB. Butane-1, 2, 3-triolC. Pentane -1, 2, 3-triolD. 2, 3- dihydroxy butanlol |
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Answer» Correct Answer - B |
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| 26. |
IUPAC name of `CH_(3)-underset(OCH_(3))underset(|)(CH)-overset(O)overset(||)(C)-underset(CH_(3))underset(|)(CH)-OCH_(2)-CH_(3)`A. 2-Methoxy-4-ethoxy-3-pentanoneB. 2-Ethoxy-4-methyoxy-3-pentanoneC. 2,4-Dimethoxy hexanoneD. 2-Ethoxy-3-methoxy-3-pentanone |
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Answer» Correct Answer - B |
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| 27. |
In which molecules resonance phenomenon operates-A. B. C. D. |
| Answer» Correct Answer - D | |
| 28. |
The `IUPAC` name of `CH_(3)-overset(OH)underset(CH_(3))underset(|)overset(|)(C)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)` isA. 2, 4-Dimethyl pentanol -2B. 2, 4 - Dimethyl pentanol -4C. 2, 2 - Dimethyl butanol - 2D. Butanol - 2 |
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Answer» Correct Answer - A |
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| 29. |
The `IUPAC` name of `CH_(2)overset(OH)overset(|)(CH)CH_(2)overset(CH_(3))overset(|)(CH)CHO` isA. 4-hydroxy -2- methyl pentanalB. 2-hydroxy -4- methyl pentanalC. 4-hydroxy-2- methyl pentanolD. 2-hydroxy-4- methyl pentanol |
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Answer» Correct Answer - A |
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| 30. |
Which of the following effects of `-NO_(2)` group operates on `-NH_(2)` group in this molecule? A. Only I-effectB. Only -M effectC. Both -I and -M effectD. Only +M effect |
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Answer» Correct Answer - A No-M effect because of stearic hindrance. |
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| 31. |
Total number of steroisomer of compound `CH_(3)-overset(OH)overset(|)(CH)-=C-overset(OH)overset(|)(CH)-C-=C-overset(OH)overset(|)(CH)-CH_(2)-CH_(3)`A. 2B. 4C. 6D. 8 |
| Answer» Correct Answer - D | |
| 32. |
Which of the following orders is correct for hyperconjugation of these radicals? A. `PgtQgtR`B. `RgtQgtP`C. `QgtPgtR`D. `PgtRgtQ` |
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Answer» Correct Answer - D `8alpha-H` is P. |
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| 33. |
Which of the following orders regarding relative stability of free radicals is correctA. `3^(@) lt 2^(@) lt 1^(@)`B. `3^(@) gt 2^(@) gt 1^(@)`C. `1^(@) lt 2^(@) gt 3^(@)`D. `3^(@) gt 2^(@) lt 1^(@)` |
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Answer» Correct Answer - B Due to the increasing no. of hyperconjugative structures free radical stabilise as following `3^(@) gt 2^(@) gt 1^(@)`. |
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| 34. |
Select the decreasing order of relative basic strengths of following species: A. ` II gt IV gt I gt III`B. `III gt I gt IV gt II`C. `III gt IV gt I gt II`D. `II gt I gt IV gt III` |
| Answer» Correct Answer - D | |
| 35. |
Correct basic strength order is : A. `r gt q gt p gt s`B. `r gt p gt q gt s`C. `q gt r gt p gt s`D. `r gt q gt s gt p` |
| Answer» Correct Answer - B | |
| 36. |
Observe the following sequence of reactions : Select the correct option regarding the relative basic strength `(K_(b))`:A. B. C. `CH_(3)-underset(NH)underset(||)C-NH_(2) gt CH_(3)NH_(2)`D. |
| Answer» Correct Answer - C | |
| 37. |
The order of basic strength of the given basic nitrogen atoms is : A. `III gt II gt I gt IV`B. `III gt I gt II gt IV`C. `I gt III gt II gt IV`D. `II gt III gt I gt IV` |
| Answer» Correct Answer - D | |
| 38. |
Among the following compounds, the increasing order of their basic strength is : A. `(I) glt (II) lt (III) lt (IV)`B. `(I) lt (II) lt (IV) lt (III)`C. `(II) lt (I) lt (III) lt (IV)`D. `(II) lt (I( lt (IV) lt (III)` |
| Answer» Correct Answer - D | |
| 39. |
Select the basic strength order of following molecules? A. `(IV) gt (I) gt (III) gt (II)`B. `(III) gt (I) gt (IV) gt (II)`C. `(II) gt (I) gt(III) gt (IV)`D. `(I) gt (III) gt (II) gt (IV)` |
| Answer» Correct Answer - D | |
| 40. |
In the labelled N-atoms which is correct basic strength order: A. `2 gt 1 gt 3`B. `3 gt 1 gt 2`C. `2 gt 3 gt 1`D. All are equally basic |
| Answer» Correct Answer - A | |
| 41. |
Select the basic strength order of following molecules ? A. `III gt II gt I`B. `II gt III gt I`C. `I gt III gt II`D. `III gt I gt II` |
| Answer» Correct Answer - A | |
| 42. |
Choose the strongest base among the following:A. B. C. D. |
| Answer» Correct Answer - D | |
| 43. |
Curved arrows are used in Organic Chemistry to show the moment of electrons in the mechanism of a reaction . The correct product of the following rection is B. C. D. |
| Answer» Correct Answer - C | |
| 44. |
Rank the non-bonding electrons indicated by the arrows in order of increasing energy. |
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Answer» Correct Answer - `C lt B lt A` `C lt B lt A`, More is the resonance lesser will be the energy of delocalising electrons. |
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| 45. |
Rank in the order of increasing basic strength. |
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Answer» Correct Answer - A-c `lt a lt b ; B-b lt a lt c lt d ; C-d lt b lt c lt a ` Acidic strong `prop` stability of conjugate base. Stability of conjugate base `prop -M` and -I on group . |
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| 46. |
Rank the following alknes on order of increasing `lambda_("max")` A. `1lt2lt3`B. `1lt3lt2`C. `2lt1lt3`D. `2lt3lt1` |
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Answer» Correct Answer - D `E=hv=(hc)/(lambda),lambda` max means less energy . `:.` most stable dienes. |
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| 47. |
The ascending order of stability of the carbanion `overset(-)(C)H_(3)(P), C_(6)H_(5)overset(-)(C)H_(2)(Q), (CH_(3))_(2)overset(-)(C)H(R)` and `H_(2)overset(-)(C)-CH = CH_(2)` isA. `P lt R lt S lt Q`B. `R lt P lt S lt Q`C. `R lt P lt Q lt S`D. `P lt R lt Q lt S` |
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Answer» Correct Answer - B Stability of carbonium is enhanced by (i) Presence of conjugation (ii) Presence of group exerting -I effect So correct order is `C_(6)H_(5)overset(-)(C)H_(2) gt H_(2)overset(-)(C)-CH= CH_(2)gt overset(-)(C)H_(3) gt (CH_(3))_(3)overset(-)(C)H`. |
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| 48. |
Arrange the following in increasing order of stability `(CH_(3))_(2)overset(o+)(C)-CH_(2)-CH_(3)` (2) `(CH_(3))_(3)overset(o+)(C)` (3) `(CH_(3))_(2)overset(o+)(C)H` (4) `CH_(3)overset(o+)(C)H_(2)` (5) `overset(o+)(C)H_(2)`A. `5 lt 4 lt 3 lt 1 lt 2`B. `4 lt 5 lt 3 lt 1 lt 2`C. `1 lt 5 lt 4 lt 3 lt 2`D. `5 lt 4 lt 3 lt 2 lt 1` |
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Answer» Correct Answer - A Stability depends on number of hyper conjugation structure. |
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| 49. |
Assertion : Benzyl bromide when kept in acetone water it produces benzyl alcohol. Reason : The reaction follows `S_(N^(2))` mechanism.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 but reason is false.D. If the assertion and reason both are false. |
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Answer» Correct Answer - A The assertion that on keeping benzyl bromide in acetone water it produces benzyl alcohol is correct. Because `C_(6)H_(5)CH_(2)Br` hydrolysed to produce `C_(6)H_(5)CH_(2)OH`. This conversion is of `S_(N^(2))` mechanism. |
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| 50. |
The electronegativities of acetylene, ethylene and ethane are in the order :A. ethylene gt acetylene gt ethaneB. acetylene gt ethylene gt ethaneC. ethane gt acetylene gt ethyleneD. acetylene gt ethane gt ethylene |
| Answer» Correct Answer - B | |