Heterolytic Cleavage

Q. Among the following, the aromatic compounds are:


Choose the correct answer from the following options:

1. (A), (B) and (C) only
2. (B), (C) and (D) only
3. (B) and (C) only
4. (A) and (B) only

Q.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

Q. Number of heteroatoms (other than C) present in the following heterocyclic compound is :

1. 3
2. 2
3. 1
4. 0

Q.

Why is DNA insoluble in alcohol?

Q. Heterolysis of carbon-chlorine bond produces

1. Two carbonium ions
2. Two free radicals
3. Two carbanions
4. One cation and one anion

Q. Arrange the given compounds in decreasing order of boilling points.

1. $\text{I}>\text{III}>\text{II}$
2. $\text{III}>\text{I}>\text{II}$
3. $\text{II}>\text{I}>\text{III}$
4. $\text{I}>\text{II}>\text{III}$

Q. Which of the following intermediate is formed during heterolytic cleavage of $C-Cu$ bond in $C{H}_{3}C{H}_{2}Cu$?

1. $C{H}_{3}C{H}_2^{-}$
2. $C{H}_{3}C{H}_2^{+}$
3. $C{u}^{-}$
4. $C{u}^{+}$

Q.

In${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$, the bond that undergoes heterolytic cleavage most readily is:

1. $\mathrm{O}-\mathrm{H}$

2. $\mathrm{C}-\mathrm{O}$

3. $\mathrm{C}-\mathrm{H}$

4. $\mathrm{C}-\mathrm{C}$

Q. Which of the following intermediate is formed during heterolytic cleavage of $C-Cu$ bond in $C{H}_{3}C{H}_{2}Cu$?

1. $C{H}_{3}C{H}_2^{-}$
2. $C{H}_{3}C{H}_2^{+}$
3. $C{u}^{-}$
4. $C{u}^{+}$

Q. Which of the following intermediate is formed, due to heterolytic cleavage of $C-Cl$ bond in $C{H}_{3}Cl$ molecule ?

1. $\stackrel{\bullet }{C}{H}_3$ and $\stackrel{\bullet }{C}l$
2. $\stackrel{-}{C}{H}_3$ and $C{l}^{+}$
3. $\stackrel{+}{C}{H}_3$ and $C{l}^{-}$
4. $\stackrel{\bullet }{C}{H}_3$ and $C{l}^{-}$

Q.

Which of the following statement is true?

1. The boiling point of NO is higher because of greater vander Waals forces than in $N_2$
   

2. The boiling point of NO is higher than that of $N_2$ because of dipole-dipole forces.
   

3. Th boiling point of NO is higher than that of $N_2$ because the former has higher moleculer weight
   

4. The boiling point of $N_2$ is higher because $N_2$ is inert.

Q.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

(a)

(b)

(c)

(d)

Q. Which of the following is an example of Heterolytic fission?

1. $C{H}_3-OH$
2. $C{H}_3-Cl$
3. F - F
4. None of these

Q.

What are hyperconjugation and inductive effect?

Q. The correct order of normal boiling points of $O_2,N_2,N{H}_3$ and $C{H}_4$ for whom the values of van der Waal's constant ${}^{\prime }{a}^{\prime }$ are $1.360,1.390,4.170\text{and}2.253{\text{L}}^2{\text{atm mol}}^{-2}$ respectively is :

1. $O_2<N_2<N{H}_3<C{H}_4$
   
2. $O_2<N_2<C{H}_4<N{H}_3$
3. $N{H}_3<C{H}_4<N_2<O_2$
4. $N{H}_3<C{H}_4<O_2<N_2$

Q. The reaction $(C{H}_3{)}_{3}C-Br\to (C{H}_3{)}_3{C}^{+}+B{r}^{-}$ is an example of:

1. homolytic fission
2. heterolytic fission
3. cracking
4. all of the above

Q. Which of the following intermediate is formed, due to heterolytic cleavage of $C-Cl$ bond in $C{H}_{3}Cl$ molecule ?

1. $\stackrel{\bullet }{C}{H}_3$ and $\stackrel{\bullet }{C}l$
2. $\stackrel{+}{C}{H}_3$ and $C{l}^{-}$
3. $\stackrel{\bullet }{C}{H}_3$ and $C{l}^{-}$
4. $\stackrel{-}{C}{H}_3$ and $C{l}^{+}$

Q.

For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.

(a)

(b)

(c)

(d)

Q. Heterolytic fission of $C-Br$ bond results in the formation of _______

1. Free radicals
2. Cations
3. Anions
4. Carbocation and anion

Q. The number of compounds which can undergo tautomerism are :

1. 1
2. 2
3. 3
4. 4

Q. Formation of a carbocation is an example of:

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

Q. A carbocation formed by heterolytic cleavage of bond is:

1. planar in shape ($s{p}^2$ hybridized carbon), with empty p orbital perpendicular to the plane of the molecule.
2. reactive towards electron rich species.
3. has a positive charge.
4. all of these

Q. Arrange the following in increasing order of $p{K}_a$ values:

1. $\text{(I) < (II) < (III) < (IV)}$
2. $\text{(I) < (II) < (IV) < (III)}$
3. $\text{(IV) < (III) < (II) < (I)}$
4. $\text{(III) < (IV) < (II) < (I)}$

Q. In $C{H}_{3}C{H}_{2}OH,|$ the bond that undergoes heterolytic cleavage most readily is -

1. C - C
2. C - O
3. C - H
4. O - H

Q. In a heterolytic bond fission of $2-$methyl$1-$phenylpropane, which of the following stable carbocation will form?

1. $C_6{H}_5-C{H}_2^{+}$
2. $(C{H}_3{)}_{2}C{H}^{+}$
3. $C{H}_3^{+}$
4. $C_6{H}_5^{+}$

Q. In which molecule is the van der Waals's force likely to be most important in determining melting point and boiling point?

1. $ICl$
2. $CO$
3. $B{r}_2$
4. $H_2$S

Q.

Conisder the above chemical reaction and identity product "A".
\( \frac{ H _{2} O }{ H ^{+}} \) "A" (Major Product)

Q. In heterolytic bond fission the formed carbanions are:

1. has octet configuration
2. $s{p}^3$ hybridized
3. reactive towards the positive charge
4. all of these

Q. Which of the following relation is correct for reactivity?
${\mathrm{CH}}_3{\mathrm{COO}}^{-}\mathrm{or}{\mathrm{CH}}_3{\mathrm{CH}}_2{S}^{-}\mathrm{with}{\mathrm{CH}}_{3}I\mathrm{in}\mathrm{ethanol}$

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2{S}^{-}>{\mathrm{CH}}_3{\mathrm{COO}}^{-}$
2. ${\mathrm{CH}}_3{\mathrm{CH}}_2{S}^{-}<{\mathrm{CH}}_3{\mathrm{COO}}^{-}$
3. ${\mathrm{CH}}_3{\mathrm{CH}}_2{S}^{-}={\mathrm{CH}}_3{\mathrm{COO}}^{-}$
4. Cannot be compared

Q.
The number of compounds which can undergo tautomerism are :