Hydrohalogenation of Alkenes

Q.

Which of the following liberates ${\mathrm{O}}_2$ upon hydrolysis?

1. ${\mathrm{Pb}}_3{\mathrm{O}}_4$

2. ${\mathrm{KO}}_2$

3. ${\mathrm{Na}}_2{\mathrm{O}}_2$

4. ${\mathrm{Li}}_2{\mathrm{O}}_2$

Q.

In the following questions two Statement-1 (Assertion) and Statement-2 (Reason) are provided. Each questions has 4 choices (a), (b), (c) and (d) for its answer, out of which ONLY ONE is correct. Mark your responses from the following options:
Statement- 1: 1-Butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane.
Statement- 2: It involves the formation of a primary radical.

1. Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanation of Statement-1.
   

2. Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.
   

3. Statement-1 is true but Statement-2 is false.
   

4. Statement-1 is false but Statement-2 is true.

Q.

What is the hydrogenation of vegetable oils?

Q.

Which catalyst is used in Hydrogenation?

Q.

A gas formed by the action of alcoholic KOH on ethyl iodide, decolorizes alkaline KMnO₄ solution. The gas is

1. C₂H₂

2. CH₄

3. C₂H₆

4. C₂H₄

Q.

Does propene react with bromine?

Q.

The Cannizzaro’s reaction is not given by

1. formaldehyde

2. Acetaldehyde

3. benzaldehyde

Q. The reaction products of $C_6{H}_{5}OC{H}_3+HI\stackrel{\Delta }{\to }$ is :

1. $C_6{H}_{5}OH+C{H}_{3}I$
2. $C_6{H}_{5}I+C{H}_{3}OH$
3. $C_6{H}_{5}C{H}_3+HOI$
4. $C_6{H}_6+C{H}_{3}OH$

Q. Consider following compounds.

Number of compounds which are more reactive than $\text{2-Chloropropane}$ for $S_{N}1$ mechanism are

Q. In which of the following reactions is a carbocation rearrangement possible?

1. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HCl,0^{\circ }C}{\to }$
2. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HBr,0^{\circ }C}{\to }$
3. $Ph-C{H}_2-CH=C{H}_2\stackrel{HBr}{\to }$
4. All of these

Q. An alkene on ozonolysis gives acetone as one of the product. The structure of alkene is:

1. 
2. 
3. 
4. 

Q.

Consider the following reaction:

$\mathrm{A}\underset{\left(\mathrm{ii}\right){\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right){\mathrm{CH}}_3\mathrm{MgBr}}{\to }}\mathrm{B}\underset{573\mathrm{K}}{\overset{\mathrm{Cu}}{\to }}2-\mathrm{methyl}-2-\mathrm{butene}$

The mass percentage of carbon in $\mathrm{A}$ is:

Q. In Toluene, the methyl group donates electrons to the benzene ring through pi conjugation.

1. True
2. False

Q. Which of the following on reaction with aqueous KOH gives acetaldehyde?

1. 1, 1-Dicholro ethane
2. Ethyl chloride
3. 1, 2-Dicholoro ethane
4. Chloro acetic acid

Q. Markovnikov’s rule:

Alkenes undergo electrophilic addition reactions. They are triggered by the acid acting as an electrophile toward the π-electrons of the double bond.

Markovnikov’s rule states that when an unsymmetrically substituted alkene reacts with a hydrogen halide, the hydrogen atom adds to the carbon that has a greater number of hydrogens, e.g.,

What is the energy profile of the given reaction?

1. 
2. 
3. 
4. 

Q.

What is the other name for anti Markovnikov rule?

1. Both A and B

2. Kharasch effect

3. Peroxide effect

4. Friedel-Crafts reaction

Q. Markovnikov’s rule:

Alkenes undergo electrophilic addition reactions. They are triggered by the acid acting as an electrophile toward the π-electrons of the double bond.

Markovnikov’s rule states that when an unsymmetrically substituted alkene reacts with a hydrogen halide, the hydrogen atom adds to the carbon that has a greater number of hydrogens, e.g.,


Which given substrate is the most reactive toward Markovnikov’s addition?

1. 
2. 
3. 
4. 

Q. Consider the following reactions carried out at the same temperature: $C{H}_{3}Br+O{H}^{-}\stackrel{C_2{H}_{5}OH}{\to }C{H}_{3}OH+B{r}^{-}$
$C{H}_{3}Br+O{H}^{-}\stackrel{(C{H}_3{)}_{2}SO}{\to }C{H}_{3}OH+B{r}^{-}$
Which of the following statements is correct about these reactions?

1. The first reaction occurs faster than the second
2. Both the reactions occurs at the same rate
3. Addition of NaI has no effect no either of these reactions
4. The second reaction occurs faster than the first

Q.

Compounds A, B and C, respectively are:

1. 
2. 
3. 
4. 

Q.
The product of the reaction is:

1. 
2. 
3. 
4. 

Q. Which of the following is the most reactive alkyl halide for a $S_{N}1$ reaction?

1. 
2. 
3. 
4. 

Q. In $S_{N}2$ reactions, the correct order of reactivity for the following compounds

1. $C{H}_{3}C{H}_{2}Cl>C{H}_{3}Cl>(C{H}_3{)}_{2}CHCl>(C{H}_3{)}_{3}CCl$
2. $(C{H}_3{)}_{2}CHCl>C{H}_{3}C{H}_{2}Cl>C{H}_{3}Cl>(C{H}_3{)}_{3}CCl$
3. $C{H}_{3}Cl>(C{H}_3{)}_{2}CHCl>C{H}_{3}C{H}_{2}Cl>(C{H}_3{)}_{3}CCl$
4. $C{H}_{3}Cl>C{H}_{3}C{H}_{2}Cl>(C{H}_3{)}_{2}CHCl>(C{H}_3{)}_{3}CCl$

Q.

Incorrect statement among the following is

1. Formation of 'X' is electrophilic addition and 'Y' is free radical addition

2. 'X' and 'Y' are positional isomers

3. 'X' gives propene with alc KOH

4. 'Y' gives 2, 3 - dimethyl butene on wurtz reaction

Q.

Is potassium permanganate natural?

Q. How is propene is converted into $1-bromopropane$ and $2-bromopropane$?

Q. The compounds P and Q respectively are

1. 
2. 
3. 
4. 

Q. Which pair of the following gives the nature of reaction sequences given below?

1. Electrophilic addition and nucleophilic substitution
2. Nucleophillic addition and electrophilic substitution
3. Nucleophilic addition and free radical substitution
4. Electrophilic addition and electrophilic substitution

Q. In which of the following reactions is a carbocation rearrangement possible?

1. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HCl,0^{\circ }C}{\to }$
2. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HBr,0^{\circ }C}{\to }$
3. $Ph-C{H}_2-CH=C{H}_2\stackrel{HBr}{\to }$
4. All of these

Q. why does only HBr show peroxide effect ?

Q.

Incorrect statement among the following is

1. Formation of 'X' is electrophilic addition and 'Y' is free radical addition

2. 'X' and 'Y' are positional isomers

3. 'X' gives propene with alc KOH

4. 'Y' gives 2, 3 - dimethyl butene on wurtz reaction