Kolbe Electrolysis for Alkenes

Q. Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): $S_{N}2$ reaction of an optically active aryl halide with an aqueous solution of $KOH$ always gives an alcohol with opposite sign of rotation.
Reason (R): $S_{N}2$ reactions always proceed with inversion of configuration.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. 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.

${\mathrm{CH}}_3\mathrm{CHO}+{\mathrm{NH}}_2\mathrm{OH}\stackrel{∆}{\to }\mathrm{P}\stackrel{{\mathrm{H}}^{+}}{\to }\mathrm{Q}\stackrel{{\mathrm{Br}}_2/\mathrm{KOH}}{\to }\mathrm{R}({\mathrm{CH}}_3{\mathrm{NH}}_2)$

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

1. I > II > III > IV
2. I > III > II > IV
3. III > I > IV > II
4. IV > III > II > I

Q. Which of the following alcohol would dehydrate the fastest when heated with acid

1. 
2. 
3. 
4. 

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

1. 
2. 
3. 
4. 

Q. The relative rate of acid catalyzed dehydration of following alcohols would be

1. III > I > IV > II
2. III > IV > I > II
3. I > III > IV > II
4. 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.

Q. process of dehydration of benzylic and allyllic alcohol??

Q. In which case would a Williamson ether synthesis fail?

1. Sodium ethoxide $+$ iodoethane
2. Sodium ethoxide $+$ iodomethane
3. Sodium ethoxide $+$ 2-iodopropane
4. Sodium ethoxide $+$ 2-iodo-2-methylpropane

Q. Assertion :Alkenes are easily attacked by electrophilic reagents. Reason: Alkenes are unstable molecules in comparison to alkanes.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Williamson synthesis of ether is an example of:

1. electrophilic substitution
2. nucleophilic substitution
3. nucleophilic additon
4. electrophilic addition

Q. Reaction of $trans-2-phenyl-1-bromocyclopentane$ on reaction with alcoholic $KOH$ produces (major):

1. $4-phenylcyclopentene$
2. $2-phenylcyclopentene$
3. $1-phenylcyclopentene$
4. $3-phenylcyclopentene$

Q.

The compound which on aqueous electrolysis liberates carbon dioxide at the anode and acetylene is:

1. Potassium citrate

2. Potassium acetate

3. Potassium succinate

4. Potassium maleate

Q. Which of the following statements are incorrect regarding following reaction?

1. Product is exocyclic alkene formed according to saytzeff
2. Product is exocyclic alkene formed according to Hofmann
3. Product is endocyclic alkene formed according to saytzeff
4. 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:

1. ethene
2. ethyne
3. bromoethane
4. ethane

Q. (E)-3-bromo-3-hexene when treated with $C{H}_3{O}^{⊝}$ in $C{H}_{3}OH$ gives

1. 2, 3-hexadiene
2. 2, 4-hexadiene
3. 3- hexyne
4. 2-hexyne

Q.

What is the reagent used and appropriate temperature required to prepare ethene from ethyl alcohol?

1. Dilute $H_{2}S{O}_4,{160}^{\circ }C$
2. Concentrated $H_{2}S{O}_4,{170}^{\circ }C$
3. Dilute $HCl,{170}^{\circ }C$
4. Concentrated $HCl,{160}^{\circ }C$

Q. In dehydration of alcohol, a molecule of ________ is eliminated from an alcohol molecule by heating the alcohol.

1. hydrogen
2. water
3. oxygen
4. carbon

Q. In the reaction, $C{H}_{3}COOH\stackrel{LiAl{H}_4}{\to }A\stackrel{PC{l}_5}{\to }B\stackrel{Alc.KOH}{\to }C,$ the product $C$ is:

1. Acetyl chloride
2. Acetaldehyde
3. Acetylene
4. Ethylene

Q. Arrange the given alkenes in decreasing order of their reactivity towards bromination:

1. i> ii> iii> iv
2. iv> iii> ii> i
3. i> ii> iv> iii
4. iii> iv> ii> i

Q. For synthesis of 1 -butene, $C{H}_{3}MgI$ should be treated with :

1. propene
2. 2 - chloropropene
3. allyl chloride
4. ethyl chloride

Q.

1. 
2. 
3. 
4. 

Q. A compound X is obtained by the reaction of alkaline $KMn{O}_3$ with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of $H_{2}S{O}_4$ to form a sweet smelling compound Z. The compound X, Y and Z are respectively.

1. Ethanol, Ethene, Ethanoic acid
2. Ethanoic acid, Ethanol, Ethylethanoate
3. Ethanoic Acid, Ethanal, Ethene
4. Ethanol, Ethanoic Acid, Sodium Ethanoate

Q. Match the complexes in List-I with their properties listed in List-II-

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 $KMn{O}_4$ give same compound. Identify the hydrocarbon.

1. 3- Methyl-2-butene
2. 2, 3-Dimethyl-1-butene
3. 2-Methyl-2-butene
4. 3, 4-Dimethyl-1-butene

Q.

For the following reaction, the product can be:

1. CH₂=CH₂

2. CH₂=CH-CH₂-CH=CH₂

3. 
   

4. H₂C=CH-CH₃

Q.

A tertiary alcohol H upon acid catalyzed dehydration gives a product I. Ozonolysis of I leads to compounds J and K.Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M.

The structure of compound I is

1. 
2. 
3. 
4.