InterviewSolution
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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.
| 201. |
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. (i) Assertion and reason both are correct and reason is correct explanation of assertion. (ii) Assertion and reason both are wrong statements. (iii) Assertion is correct but reason is wrong statement. (iv) Assertion is wrong but reason is correct statement. (v) Assertion and reason both are correct statements but reason is not correct explanation of assertion.Assertion: It is difficult to replace chlorine by –OH in chlorobenzene in comparison to that in chloroethane.Reason : Chlorine-carbon (C—Cl) bond in chlorobenzene has a partial double bond character due to resonance |
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Answer» (i) Assertion and reason both are correct and reason is correct explanation of assertion. |
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| 202. |
Silver propionate when refluxed with Bromine in carbon tetrachioride gives ………… (a) propionic acid (b) chioroethane (c) bromoethane (d) chioropropane |
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Answer» (c) bromoethane |
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| 203. |
Give reasons :The presence of nitro group (-NO2)at O/P positions increases the reactivity of haloarenes towards nucleophilic substitution reactions. |
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Answer» -NO2 acts as Electron withdrawing group or -l effect. Detailed Answer: In haloarenes, NO2 group is present at O/P position results in the stabilisation of resulting carbanion by-R and - I effects and therefore increases the reactivity of haloarenes towards nucleophilic substitution reactions. |
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| 204. |
Account for the following (a) Haloarenes are less reactive towards nucleophilic substitution reactions.(b) Grignard reagents should be prepared under anhydrous conditions .(c) Melting point of p- dichlorobenzene is more than O & m isomers. |
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Answer» (a) due to resonance a partial double bond character is developed between C & X or any other suitable reason (b) because they are highly reactive towards any source of H+ (c) due to more symmetry of p-dichlorobenzene. |
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| 205. |
Give the IUPAC names of the following compounds: |
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Answer» 2- bromobutane |
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| 206. |
Give the IUPAC names of the following compounds: |
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Answer» 1, 3, dibromobenzene |
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| 207. |
Cyanide ion acts as an ambident nucleophile. From which end it acts as a stronger nucleophile in aqueous medium? Give reason for your answer. |
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Answer» It acts as a stronger nucleophile from the carbon end because it will lead to the formation of C – C bond which is more stable (bond between two similar atoms) than C – N bond. |
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| 208. |
Cyanide ion acts as an ambident nucleophile. From which end it acts as a stronger nucleophile in aqueous medium? Give reason for your answer. |
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Answer» It acts as a stronger nucleophile from the carbon end because it will lead to the formation of C–C bond which is more stable than the C–N bond. |
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| 209. |
lodoform can be used as |
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Answer» lodoform can be used as Antiseptic. |
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| 210. |
……… is used for extinguishing the fire caused by oil or petrol under the commercial name pyrene. |
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Answer» Tetrachioromethane is used for extinguishing the fire caused by oil or petrol under the commercial name pyrene. |
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| 211. |
in oil fire extinguisher, the compound used pyrene is chemically |
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Answer» in oil fire extinguisher, the compound used pyrene is chemically CCl4 |
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| 212. |
Out of SN1 and SN2, which reaction occurs with(a) Inversion of configuration(b) Racemisation |
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Answer» (a) SN2 (b) SN1 |
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| 213. |
Why HNO3 is added during iodination of benzene. |
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Answer» When benzene is reacted with iodine, the reaction is reversible in nature. It leads to the formation of reactants back. Therefore and oxidizing agent like HNO3 oxidizes the HI formed in the reaction to I2 keeps the reaction in forward direction. |
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