Kolbe Electrolysis for Alkenes
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Q. Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): SN2 reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation.
Reason (R): SN2 reactions always proceed with inversion of configuration.
Assertion (A): SN2 reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation.
Reason (R): SN2 reactions always proceed with inversion of configuration.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Q.
Explain the following with an example.
Kolbe's reaction
Reimer-Tiemann reaction
Williamson ether synthesis
Unsymmetrical ether
Q.
CH3COOH + O2 =?
Q.
Identify P and Q
Q. Arrange the following compounds in order of decreasing reactivity towards electrophilic substitution reaction.
(I) Benzene
(II) Nitrobenzene
(III) 1, 3-Dinitrobenzene
(IV) 1, 3, 5-Trinitrobenzene
(I) Benzene
(II) Nitrobenzene
(III) 1, 3-Dinitrobenzene
(IV) 1, 3, 5-Trinitrobenzene
- I > II > III > IV
- I > III > II > IV
- III > I > IV > II
- IV > III > II > I
Q. Which of the following alcohol would dehydrate the fastest when heated with acid
Q. An alkane C7H16 is produced by the reaction of lithium di-3pentlycuprate with ethyl bromide. The structural formula of product is
Q. The compound which would yield 5 – Oxo, 2 – methyl hexanal on reductive ozonalysis
Q. The relative rate of acid catalyzed dehydration of following alcohols would be
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/16543/content_capture.png)
![](https://search-static.byjusweb.com/question-images/byjus/infinitestudent-images/ckeditor_assets/pictures/16543/content_capture.png)
- III > I > IV > II
- III > IV > I > II
- I > III > IV > II
- III > IV > I > II
Q. Explain the following with an example.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.
(i) Kolbes reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.
Q. process of dehydration of benzylic and allyllic alcohol??
Q. In which case would a Williamson ether synthesis fail?
- Sodium ethoxide + iodoethane
- Sodium ethoxide + iodomethane
- Sodium ethoxide + 2-iodopropane
- Sodium ethoxide + 2-iodo-2-methylpropane
Q. Assertion :Alkenes are easily attacked by electrophilic reagents. Reason: Alkenes are unstable molecules in comparison to alkanes.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
Q. Reaction of trans−2−phenyl−1−bromocyclopentane on reaction with alcoholic KOH produces (major):
- 4−phenylcyclopentene
- 2−phenylcyclopentene
- 1−phenylcyclopentene
- 3−phenylcyclopentene
Q. Williamson synthesis of ether is an example of:
- electrophilic substitution
- nucleophilic substitution
- nucleophilic additon
- electrophilic addition
Q.
The compound which on aqueous electrolysis liberates carbon dioxide at the anode and acetylene is:
Potassium citrate
Potassium acetate
Potassium succinate
Potassium maleate
Q. Which of the following statements are incorrect regarding following reaction?
![1717774_c5a6cbc21d454c89a6f22cfd2a02692c.PNG](https://search-static.byjusweb.com/question-images/toppr_ext/questions/1717774_c5a6cbc21d454c89a6f22cfd2a02692c.PNG)
- Product is exocyclic alkene formed according to saytzeff
- Product is exocyclic alkene formed according to Hofmann
- Product is endocyclic alkene formed according to saytzeff
- Product is endocyclic alkene formed according to Hofmann
Q. The compound formed when an alcoholic solution of ethylene dibromide is heated with granulated zinc is:
- ethene
- ethyne
- bromoethane
- ethane
Q.
What is the reagent used and appropriate temperature required to prepare ethene from ethyl alcohol?
- Dilute H2SO4, 160∘C
- Concentrated H2SO4, 170∘C
- Dilute HCl, 170∘C
- Concentrated HCl, 160∘C
Q. In dehydration of alcohol, a molecule of ________ is eliminated from an alcohol molecule by heating the alcohol.
- hydrogen
- water
- oxygen
- carbon
Q. (E)-3-bromo-3-hexene when treated with CH3O⊝ in CH3OH gives
- 2, 3-hexadiene
- 2, 4-hexadiene
- 3- hexyne
- 2-hexyne
Q. What happens when ethyl bromide is heated with zinc? Give equations only:
Q. In the reaction, CH3COOHLiAlH4−−−−→APCl5−−−→BAlc.KOH−−−−−−→C, the product C is:
- Acetyl chloride
- Acetaldehyde
- Acetylene
- Ethylene
Q. Arrange the given alkenes in decreasing order of their reactivity towards bromination:
![765695_07d35783198a458b9e9b1e9d2e98b7fc.png](https://search-static.byjusweb.com/question-images/toppr_ext/questions/765695_07d35783198a458b9e9b1e9d2e98b7fc.png)
![765695_07d35783198a458b9e9b1e9d2e98b7fc.png](https://search-static.byjusweb.com/question-images/toppr_ext/questions/765695_07d35783198a458b9e9b1e9d2e98b7fc.png)
- i> ii> iii> iv
- iv> iii> ii> i
- i> ii> iv> iii
- iii> iv> ii> i
Q. Match the complexes in List-I with their properties listed in List-II-
Q. A compound X is obtained by the reaction of alkaline KMnO3 with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of H2SO4 to form a sweet smelling compound Z. The compound X, Y and Z are respectively.
- Ethanol, Ethene, Ethanoic acid
- Ethanoic acid, Ethanol, Ethylethanoate
- Ethanoic Acid, Ethanal, Ethene
- Ethanol, Ethanoic Acid, Sodium Ethanoate
Q. A hydrocarbon on ozonolysis gives one mole each of compounds A and B. Both A and B on reduction with sodium borohydride gives compounds C and D belonging to same homologous series. C has no position isomer whereas D has position isomer. A and B do not belong to the same homologous series. However, both A and B on oxidation with acidified KMnO4 give same compound. Identify the hydrocarbon.
- 3- Methyl-2-butene
- 2, 3-Dimethyl-1-butene
- 2-Methyl-2-butene
- 3, 4-Dimethyl-1-butene
Q. For synthesis of 1 -butene, CH3MgI should be treated with :
- propene
- 2 - chloropropene
- allyl chloride
- ethyl chloride
Q. Using anhydrous AlCl3 as catalyst, which one of the following reaction produces ethylbenzene (PhEt)?
- H3C−CH2OH+C6H6
- H2C=CH2+C6H6
- CH3−CH=CH2+C6H6
- H3C−CH3+C6H6