Addition Reactions

Q.

What are tarry oxidation products?

Q. The reactivity of halogen acid with alkene to form haloalkanes are in the order:

1. $HI>HBr>HCl>HF$
2. $HF>HBr>HCl>HI$
3. $HI>HF>HCl>HBr$
4. $HI>HCl>HF>HBr$

Q. A hydrocarbon 'X' on reaction with $B{r}_2$ in presence of $CC{l}_4$ decolourises bromine water.
Also 'X' reacts with $KMn{O}_4$ in the presence of an acid to give two moles of the same carboxylic acid.
The structure of 'X' is:

1. $C{H}_{3}CH=CHC{H}_{2}C{H}_{2}C{H}_3$
2. $C{H}_{3}C{H}_{2}CH=CHC{H}_{2}C{H}_3$
3. $C{H}_{3}C{H}_{2}C{H}_2-CH=CHC{H}_3$
4. $C{H}_2=CHC{H}_{2}C{H}_{2}C{H}_3$

Q. A hydrocarbon with the formula $C_{10}{H}_{16}$ gives 4-methyl-3-oxopentanal and 3-oxobutanal on reductive ozonolysis. Its structure is

1. 
2. 
3. 
4. a and c

Q. Consider the addition of $HBr$ to 3, 3-dimethylbut-1-ene as shown below :


Which of the following represents correct mechanistic explanation for the formation of above product?

1. Protonation of alkene followed by a hydride shift and addition of bromide to the carbocation.
2. Double bond shift in the alkene followed by protonation and addition of bromide to the carbocation.
3. Addition of bromide to the alkene followed by a double bond shift and protonation.
4. Protonation of alkene followed by a methyl shift and addition of bromide to the carbocation.

Q. A hydrocarbon (X) having formula $C_5{H}_{10}$ reacts with HI to give (Y) which on reacting with alcoholic KOH forms (Z). The hydrocarbon is

1. 
2. 
3. 
4. 

Q. Which of the following most accurately describes the first step in the reaction of $HCl$ with but-1-ene?

1. 
2. 
3. 
4. 

Q. Which of the following is/are incorrect?

1. $C{H}_3-NCS$ and $Si{H}_{3}NCS$ have the same shape
2. $IC{l}_3$ shows bridge bonding
3. $ICl$ on hydrolysis gives hypoiodous acid and hydrochloric acid
4. $Xe{F}_6+H_{2}O\to Xe{O}_3+HF$ is a redox reaction

Q. Which alkene on heating with alkaline $KMn{O}_4$ solution gives acetone and a gas, which turns lime water milky?

1. 2-Methyl-2-butene
2. Isobutylene
3. 1-Butene
4. 2- Butene

Q.

The reaction between ethylene and bromine is an example of:

1. Electrophilic addition

2. Electrophilic substitution

3. Nucleophilic addition

4. Nucleophilic substitution

Q. The addition of HBr to an alkene in the presence of peroxide is an example of :

1. nucleophilic addition reaction
2. electrophilic substitution reaction
3. free radical addition reaction
4. acid catalysed reaction

Q. Which compound would give only oxalaldehyde (ethanedial) upon ozonolysis?

1. 
2. 
3. $C{H}_2=CH-CH=C{H}_2$
4. $C{H}_2=C=C=C{H}_2$

Q. With Baeyer's reagent ethene forms:

1. Ethane-1, 2-diol
2. Oxalic acid
3. Formic acid
4. None of the above

Q. Choose the correct statement regarding step-I.

1. Reaction follows $E_1$ mechanism
2. Reaction follows $E_2$ mechanism
3. Reaction follows $E_{1}cB$ mechanism
4. Hoffmann rule of elimination is adhered to

Q.
The number of stereomers of the given compound is X. The value of X/4 is .

Q. Propene reacts with $C{l}_2$ at $400-{600}^{\circ }C$to give:

1. 1, 2-Dichloropropane
2. Allyl Chloride
3. No Reaction
4. Polyvinyl Chloride

Q. The alkene limonene has the following structure, The product that results from the reaction of limonene and 1 molar equivalent chlorine water is:

1. 
2. 
3. 
4. 

Q. $C{H}_3-C\equiv C-C{H}_3\underset{\left(2\right)B{r}_2,CC{l}_4}{\overset{\left(1\right)H_2/Pd/CaC{O}_{3}orBaS{O}_4}{\to }}X$

1. 2, 3-Dibromobutane
2. 1, 3-Dibromobutane
3. 2-bromobutane
4. All of the above.

Q. Which of the following organic compound produces acetone and formaldehyde during reductive ozonolysis ?

1. But-1-ene
2. 3-Methylbut-1-ene
3. 2-Methylbut-2-ene
4. 2-Methylprop-1-ene

Q.

Which are free radical reactions

$I.C{H}_3-CH=C{H}_2+HBr\stackrel{Peroxide}{\to }C{H}_3-C{H}_2-C{H}_{2}BrII.C{H}_3-CH=C{H}_2+HBr\to C{H}_3-CHBr-C{H}_{3}III.C{H}_3-CH=C{H}_2+C{l}_2\to ClC{H}_2-CH=C{H}_{2}IV.C{H}_3-C{H}_3+C{l}_2\to ClC{H}_2-C{H}_3$

1. Only I

2. I, III and IV

3. III and IV

4. IV and I

Q. For the given reaction , the major products A and B respectively are :

1. 1-chloroporpane and Ethyne
2. 1, 2-dichloroethane and ethane
3. chloroethane and ethane
4. None of the above

Q. In which of the following, Anti Markovnikov addition of HBr is not observed?

1. propene
2. but-1-ene
3. but-2-ene
4. pent-2-ene

Q. Propene when heated with chlorine at about ${500}^{\circ }C$forms

1. $C{H}_{2}Cl.CH=C{H}_2$
2. $C{H}_3.CHCl.C{H}_{2}Cl$
3. $C{H}_{2}Cl.CHCl.C{H}_{2}Cl$
4. $Allthethree$

Q. What is the product of the reaction of 1, 3-butadiene with $B{r}_2$

1. 1, 4 –dibromobutene
2. 1, 2 -dibromobutene
3. 3, 4-dibromobutene
4. 2, 3-dibromo-2-butene

Q. Presence of peroxides affects the addition of

1. HBr
2. HCl
3. HI
4. All of these

Q. For the given reaction :

Which of the following can be the reactant (R)?

1. 
2. 
3. 
4. 

Q. Propene when heated with chlorine at about ${500}^{\circ }C$forms

1. $C{H}_{2}Cl.CH=C{H}_2$
2. $C{H}_3.CHCl.C{H}_{2}Cl$
3. $C{H}_{2}Cl.CHCl.C{H}_{2}Cl$
4. $Allthethree$

Q. An isomer of anisole is:

1. Toluene
2. Aniline
3. Benzaldehye
4. Cresol

Q.
Decreasing order of rate of reaction of compounds towards electrophilic addition reaction with $HBr$ is :

1. $\left(a\right)>\left(b\right)>\left(c\right)>\left(d\right)$
2. $\left(b\right)>\left(c\right)>\left(a\right)>\left(d\right)$
3. $\left(d\right)>\left(b\right)>\left(c\right)>\left(a\right)$
4. $\left(b\right)>\left(d\right)>\left(c\right)>\left(a\right)$

Q. Which of the following reaction will take place at fastest rate?

1. 
2. 
3. 
4.