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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. |
The isomers that can be interconverted through rotation around a single bond are:A. Geometrical isomersB. ConformersC. EnantiomersD. Diastereomers |
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Answer» Correct Answer - B Conformation -Conformation arises because of free rotation around `C-C` bond axis. |
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| 2. |
The number of structure isomers possible from the molecular formula `C_(3)H_(9)N` is:A. `2`B. `3`C. `4`D. `5` |
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Answer» Correct Answer - C `{:(C_(3)H_(9)N:-CH_(3)-CH_(2)-CH_(2)-NH_(2)),(CH_(2)-underset(NH_(2))underset(|)(CH)-CH_(3)):}]1^(@) "amine"` `CH_(3)-CH_(2)-NH-CH_(3)}2^(@) "amine"` `CH_(3)-underset(NH_(2))underset(|)(N)-CH_(2)]3^(@)"amine"` |
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| 3. |
Base strength of `(1) H_(3)Coverset(Theta)(C)H_(2), (2) H_(2)C=overset(Theta)(C)H` and (3) `H-C-=overset(Theta)(C)` is in the order ofA. `(3)gt(2)gt(1)`B. `(1)gt(3)gt(2)`C. `(1)gt(2)gt(3)`D. `(2)gt(1)gt(3)` |
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Answer» Correct Answer - C The stronger is the acid, the more is the nucleophilicity of conjugate base. Acidic nature: `CH-=CHgtCH_(2)=CH_(2)gtCH_(3)-CH_(3)` Conjugate basic: `CH-=C^(-) lt CH_(2)=CH^(-) lt CH_(3)-CH_(2)^(-))` nature. |
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| 4. |
Find the strongest acid among the following compoundA. `HOOC-(CH_(2))_(2)-COOH`B. `-(CH_(2))_(2)-COOH`C. `F-(CH_(2))_(2)-COOH`D. `CH_(3)-(CH_(2))_(2)-COOH` |
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Answer» Correct Answer - B `H_(3)N^(o+)-(CH_(2))_(2)-COOH` has strongest acid due to strong `-I` effect of `-N^(o+)H_(3)`. |
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| 5. |
Which of the follwing is not the characteristic of the mechanism of free radical halogenation chain reactions?A. It gives major product derived from most stable free radicalsB. It is usually sensitive to change in solvent polarityC. It proceeds in three main steps like initiation, propagations and terminationD. It may be initiated `UV` light |
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Answer» Correct Answer - B This option is not characteristics of free radical chain reaction. |
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| 6. |
Among the following the strongest nucleophilic isA. `C_(2)H_(5)SH`B. `CH_(3)CO O^(-)`C. `CH_(3)NH_(2)`D. `NC CH_(2)^(-)` |
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Answer» Correct Answer - B Metamerism is a special type of isomerism shown by secondary amines, ethers and ketones. |
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| 7. |
Which one of the following is the most reactive towards electrophilic attack?A. B. C. D. |
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Answer» Correct Answer - B The group showing electron-donating field effect (such as `-NH_(2),-OH`) should stabilize the intermediate ions, i.e., makes the ring more reactive towards electrophilic substitution than benzene and are called activating group. While electron-withdrawing group (such as `-Cl,NO_(2)`) increases the positive charge on ring, thus deactivates the ring. hence, phenol is more readily attacked by an electrophile. |
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| 8. |
Assertion: The order of reactivity of carbonium ions is `1^(@)gt2^(@)gt3^(@)`. Reason: Carbon atom in carbonium ions is in `sp^(3)` state of hybridisation.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true and the reason is the correct explanations of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
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Answer» Correct Answer - C The order of reactivity of carbonium ions is `1^(@)gt2^(@)gt3^(@)`. Carbon atom in carbonium ion is `sp^(2)` state of hybridisation. The three hybridized of there `sigma` bonds with three atoms involved in the formation of three `sigma` bonds with three atoms or group while the unhybridised `p`-orbital remains vacant. |
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| 9. |
Which of the following reactions is an example of nucleophilic substitution reaction?A. `RX+MgtoRMgX`B. `RX+KOHtoROH+KX`C. `2RX+2NatoR-R+2NaX`D. `RX+H_(2)toRH+HX` |
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Answer» Correct Answer - B `KOHtoK^(+)+OH^(-)` `RX+OH^(-)toR-OH+X^(-)` Nucleophilse are either negatively charged or lone pair of electrons learning species e.g., `OH^(-),ddot(N)H_(3)`, etc. |
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| 10. |
Which of the following compounds are not arranged in order of decreasing reactivity towards electrophilic substitutionA. Flurobenzene `gt` chlorobenzene `gt` bromobenzeneB. Phenol `gt n`-propyl benzene `gt` benzoic acidC. Chlorotoluene `gt` para-nitrotolunene `gt 2`-chloro-`4` nitrotoueneD. Benzoic acid `gt` phenol `gt n`-propyl benzene |
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Answer» Correct Answer - D `-COOH` group is a deactivating group, hence benzoic acid is less reactive towards electrophilic substitution than phenol. |
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