31. Which of the following order is not correct ?
A
$$MeBr > M{e_2}CHBr > M{e_3}CBr$$ $$ > E{t_3}CBr\left( {{S_N}2} \right)$$
B
$$PhC{H_2}Br > Ph\,CHBrMe > $$ $$PhCBrM{e_2} > PhCBrMePh\left( {{S_N}1} \right)$$
C
$$MeI > MeBr > MeCl > MeF\left( {{S_N}2} \right)$$
D
$${\text{All are correct}}$$
Answer :
$$PhC{H_2}Br > Ph\,CHBrMe > $$ $$PhCBrM{e_2} > PhCBrMePh\left( {{S_N}1} \right)$$
32.
Match the column I with column II and mark the appropriate choice.
Column I
Column II
a.
$$C{H_3}CHC{l_2}$$
1.
Vinyl halide
b.
$$C{H_2}ClC{H_2}Cl$$
2.
Alkylidene halide
c.
$$CHCl = C{H_2}$$
3.
Alkylene dihalide
d.
$$ClC{H_2} - CH = C{H_2}$$
4.
Allyl halide
A
a - 1, b - 2, c - 4, d - 3
B
a - 2, b - 3, c - 1, d - 4
C
a - 3, b - 4, c - 2, d - 1
D
a - 4, b - 1, c - 3, d - 2
Answer :
a - 2, b - 3, c - 1, d - 4
33.
Among the given halides, which one will give same product in both $${S_N}1$$ and $${S_N}2$$ reactions ?
A
(III) only
B
(I) and (II)
C
(III) and (IV)
D
(I), (III) and (IV)
Answer :
(III) and (IV)
34.
Arrange the following compounds in decreasing order of their boiling points.
$$\eqalign{
& \left( {\text{i}} \right)C{H_3}Br \cr
& \left( {{\text{ii}}} \right)C{H_3}C{H_2}Br \cr
& \left( {{\text{iii}}} \right)C{H_3}C{H_2}C{H_2}Br \cr
& \left( {{\text{iv}}} \right)C{H_3}C{H_2}C{H_2}C{H_2}Br \cr} $$
A
(i) > (ii) > (iii) > (iv)
B
(iv) > (iii) > (ii) > (i)
C
(i) > (iii) > (ii) > (iv)
D
(iii) > (iv) > (i) > (ii)
Answer :
(iv) > (iii) > (ii) > (i)
35.
The major product formed in the following reaction is
\[C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
H
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,C{{H}_{2}}Br\xrightarrow[C{{H}_{3}}OH]{C{{H}_{3}}{{O}^{-}}}\]
A
\[C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
H\,
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,C{{H}_{2}}OC{{H}_{3}}\]
B
\[C{{H}_{3}}\underset{\begin{smallmatrix}
|\,\,\,\, \\
\,\,\,OC{{H}_{3}}
\end{smallmatrix}}{\mathop{-CH-}}\,C{{H}_{2}}C{{H}_{3}}\]
C
\[C{{H}_{3}}-\overset{\begin{smallmatrix}
\,C{{H}_{3}} \\
|\,\,\,\,\,
\end{smallmatrix}}{\mathop{C=}}\,C{{H}_{2}}\]
D
\[C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,\,\,\,\,\,OC{{H}_{3}}
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,C{{H}_{3}}\]
Answer :
\[C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,\,\,\,\,\,OC{{H}_{3}}
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,C{{H}_{3}}\]
36. Which of the following statements is correct?
A
In the electrophilic substitution of toluene with $$B{r_2},$$ iron (III) bromide acts as a Lewis acid.
B
In the reaction of toluene with $$\frac{{C{l_2}}}{{FeC{l_3}}},ortho$$ and $$para$$ isomers are easily separated.
C
Similar reaction with iodine is reversible in nature.
D
All of these
Answer :
All of these
37. Which of the following compounds will have highest melting point?
A
Chlorobenzene
B
$$o$$ - Dichlorobenzene
C
$$m$$ - Dichlorobenzene
D
$$p$$ - Dichlorobenzene
Answer :
$$p$$ - Dichlorobenzene
38. The reaction of toluene with chlorine in presence of ferric chloride gives predominantly :
A
benzoyl chloride
B
$$m $$ - chlorotoluene
C
benzyl chloride
D
$$o $$ - and $$p $$ - chlorotoluene
Answer :
$$o $$ - and $$p $$ - chlorotoluene
39. Which of the following statements regarding the $${S_N}1$$ reaction shown by alkyl halide is not correct?
A
The added nucleophile plays no kinetic role in $${S_N}1$$ reaction.
B
The $${S_N}1$$ reaction involves the inversion of configuration of the optically active substrate.
C
The $${S_N}1$$ reaction on the chiral starting material ends up with racemisation of the product.
D
The more stable the carbocation intermediate the faster the $${S_N}1$$ reaction.
Answer :
The $${S_N}1$$ reaction involves the inversion of configuration of the optically active substrate.
40.
Arrange the following compounds in order of their reactivity towards $${S_N}2$$ reaction.
\[\begin{align}
& \left( \text{i} \right)C{{H}_{3}}{{\left( C{{H}_{2}} \right)}_{3}}C{{H}_{2}}Br \\
& \left( \text{ii} \right){{\left( C{{H}_{3}} \right)}_{2}}CHC{{H}_{2}}C{{H}_{2}}Br \\
& \left( \text{iii} \right)C{{H}_{3}}C{{H}_{2}}\underset{{}}{\overset{\begin{smallmatrix}
\,C{{H}_{3}} \\
|\,\,\,\,\,
\end{smallmatrix}}{\mathop{-CH-}}}\,C{{H}_{2}}Br \\
& \left( \text{iv} \right)C{{H}_{3}}\underset{\begin{smallmatrix}
| \\
\,\,\,\,C{{H}_{3}}
\end{smallmatrix}}{\overset{\begin{smallmatrix}
\,\,\,\,\,C{{H}_{3}} \\
|
\end{smallmatrix}}{\mathop{-C-}}}\,C{{H}_{2}}Br \\
\end{align}\]
A
(i) > (ii) > (iii) > (iv)
B
(ii) > (iii) > (iv) > (i)
C
(iii) > (i) > (ii) > (iv)
D
(iv) > (ii) > (i) > (iii)
Answer :
(i) > (ii) > (iii) > (iv)