Homolytic Cleavage

Q. What is difference between Nucleophilic addition and Nucleophilic substitution?

Q.

What is free radical chain reaction?

Q. Which one of the following cleavage leads to generation of free radical?

1. Homolytic cleavage
2. Heterolytic cleavage
3. None of the above
4. Both (a) and (b)

Q. Predict the products formed due to the homolytic cleavage of the $C-Br$ bond in $(C{H}_3{)}_{3}CBr$.

1. $(C{H}_3{)}_3{C}^{\bullet }$
2. $B{r}^{\bullet }$
3. $B{r}^{-}$
4. $(C{H}_3{)}_3{C}^{+}$

Q. Homolytic fission of C—C bond in ethane gives an intermediate in which carbon is….. hybridized.

1. sp
2. sp³
3. sp² d
4. sp²

Q. Predict the products formed due to the homolytic cleavage of the $C-Br$ bond in $(C{H}_3{)}_{3}CBr$.

1. $(C{H}_3{)}_3{C}^{\bullet }$
2. $B{r}^{\bullet }$
3. $B{r}^{-}$
4. $(C{H}_3{)}_3{C}^{+}$

Q. $B{r}_2\stackrel{\Delta }{\underset{h\nu }{⟶}}?$
Identify the product(s).

1. $B{r}^{\bullet }$
2. $B{r}^{+},B{r}^{-}$
3. $B{r}^{+}$
4. $B{r}^{-}$

Q. Homolytic bond fission takes place in :

1. polar covalent bond
2. non-polar covalent bond
3. electrovalent bond
4. in all of these

Q.
Which of the following statement is correct for the given structure?

1. In the dianion, all the $C-C$ bond lengths are not of same length
2. In the dianion, all the $C-C$ bonds are of same length but $C-O$ bonds are of different length
3. In the dianion, all the $C-C$ bond are of same length and also all $C-O$ bonds are of same length
4. None of the above

Q. Hydrogen atoms are almost terminal atoms in Lewis formula.

1. 1
2. 0
3. both
4. none

Q. Explain the mechanism of nucleophilic bimolecular substitution $S{N}^2$ reaction with one example.

Q. ${CH}_3{CH}_2-Cl$ undergoes homolytic fission to produce :

1. ${CH}_3{\dot{CH}}_{2}and\dot{Cl}$
2. ${CH}_3{CH}_{2}and{Cl}^{\ominus }$
3. ${CH}_3{\stackrel{\oplus }{C}H}_{2}and{Cl}^{\ominus }$
4. ${CH}_3{\stackrel{\oplus }{C}H}_{2}and{Cl}^{\oplus }$

Q. Arrange the following compounds in increasing order of rate of reaction towards nucleophilic substitution.

1. $I<II<III$
2. $II<I<III$
3. $I<III<II$
4. $III<II<I$

Q. Which of the following species formed by homolytic bond fission?

1. carbanion
2. carbocation
3. free radical
4. none of these

Q. Assertion :$4-Nitro$ chlorobenzene undergoes nucleophilic substitution more readily than chlorobenzene. Reason: Chlorobenzene undergoes nucleophilic substitution by elimination addition mechanism while $4-nitrochloro$ benzene undergoes nucleophilic substitution by addition elimination mechanism.

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. Assertion is incorrect but Reason is correct

Q. Homolytic fission of $C-C$ bond in ethane gives an intermediate in which carbon is:

1. $s{p}^3$- hybridised
2. $s{p}^2$- hybridised
3. $sp$- hybridised
4. $s{p}^{2}d$- hybridised

Q. Homolytic fission of a covalent bond produces ______ .

Q. A polar solvent and high temperature favours to:

1. homolytic bond fission
2. heterolytic bond fission
3. both A and B
4. none of these

Q. Which of the following intermediate has complete octet?

1. None of these
2. Carbocation
3. Carbanion
4. Free radical

Q. What are the names and nature of the parts formed by homolytic fission?

Q.

Which combination is best explained by the co-ordinate covalent bond

1. 

2. 

3. 

4. 

Q. The reaction intermediate produce by homolytic cleavage of bond is called.

1. Carbanions
2. Carbocations
3. Free radicals
4. Carbenes

Q. Which of the following compound will favour to homolytic bond fission?

1. $C{H}_3-H$
2. $Cl-Cl$
3. $B{r}_2$
4. All of these

Q. For the following bond cleavages, use curved arrows to show the electron flow and classify each as homolysis or heterolysis.

Q. In which of the following, homolytic bond fission takes place?

1. Addition of HBr to double bond
2. Hydrolysis of ethyl chloride
3. Nitration of Benzene
4. Free radical chlorination of methane

Q.

Which of the following cleavage of bond can result in Homolytic Cleavage?

1. 

2. 

3. 

4. 

Q. Photochemical chlorination is initiated by a process of

1. Pyrolysis
2. Substitution
3. Cracking
4. Homolysis
5. Oxidation

Q. Which of the following is a suithble condition for homolytic bond fission?

1. High temperature
2. Ultraviolet radiation
3. Polar solvent
4. All of these

Q. Which of the following is solid at room temperature?

1. $CO$
2. $C{O}_2$
3. $Si{O}_2$
4. $O{F}_2$