Sulphonation by Conc H2SO4, Oleum

Q.

In nitration HNO₃ and H₂SO₄ act as:

1. Both acid

2. Both base

3. HNO₃: acid and H₂SO₄: base

4. HNO₃: base and H₂SO₄: acid

Q. In the sulphonation of benzene, the active electrophilic species is:

1. $S{O}_2$
2. $S{O}_3$
3. $S{O}_4^{3-}$
4. $HS{O}_4^{-}$

Q. The electrophile in sulphonation of benzene using fuming sulphuric acid is:

1. $S{O}_3^{+}$
2. $S{O}_3$
3. $S{O}_3^{-}$
4. $HS{O}_4^{+}$

Q. Which of the following undergoes sulphonation fastest?

1. 
2. 
3. 
4. 

Q. Arrange the following reaction mechanism of sulphonation of benzene

1. $\mathrm{Formation}\mathrm{of}\mathrm{Arenium}\mathrm{ion}$
2. $\mathrm{Formation}\mathrm{of}\mathrm{electrophile}$
3. $\mathrm{Formation}\mathrm{of}\mathrm{benzene}\mathrm{sulphonate}\mathrm{anion}$
4. $\mathrm{Formation}\mathrm{of}\mathrm{benzene}\mathrm{sulphonic}\mathrm{acid}$

Q. In halogenation of arenes, the main function of using a lewis acids like $AlC{l}_{3}orFeB{r}_3$ is for the generation of :
(Here X is the halogen)

1. $X$
2. $X^{-}$
3. $X^{+}$
4. $\stackrel{\bullet }{X}$

Q. 1 mole of phenol reacts with bromine to give 2, 4, 6-tribromophenol. The amount of bromine required is:

1. 3.0 moles
2. 1.5 moles
3. 4.5 moles
4. 6.0 moles

Q. How many coordinated water molecule(s) is/are present in brown ring complex ?

Q. The brown ring test for $N{O}_2^{-}$ and $N{O}_3^{-}$ is due to the formation of complex ion with formula :

1. $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$
2. $\left[Fe\right(NO\left)\right(CN{)}_5{]}^{2-}$
3. $\left[Fe\right(H_{2}O{)}_{5}NO{]}^{2+}$
4. $\left[Fe\right(H_{2}O\left)\right(NO{)}_5{]}^{2+}$

Q. $FeS{O}_4$ solution gives a brown coloured ring during the test for nitrates or nitrites. This is due to the formation of :

1. $\left[Fe\right(H_{2}O{)}_{5}NO{]}^{2+}$
2. $\left[Fe\right(H_{2}O{)}_{5}N{O}_2{]}^{2+}$
3. $\left[Fe\right(H_{2}O{)}_4(NO{)}_2{]}^{2+}$
4. $\left[Fe\right(H_{2}O{)}_{4}NO{]}^{2+}$

Q. How many number of moles of Grignard reagent are consumed by the given compound, when treated with excess of $MeMgBr$?

Q. Arrange the following reaction mechanism of sulphonation of benzene

1. $\mathrm{Formation}\mathrm{of}\mathrm{Arenium}\mathrm{ion}$
2. $\mathrm{Formation}\mathrm{of}\mathrm{electrophile}$
3. $\mathrm{Formation}\mathrm{of}\mathrm{benzene}\mathrm{sulphonate}\mathrm{anion}$
4. $\mathrm{Formation}\mathrm{of}\mathrm{benzene}\mathrm{sulphonic}\mathrm{acid}$

Q. Arrange the following reaction mechanism of sulphonation of benzene

1. $\mathrm{Formation}\mathrm{of}\mathrm{Arenium}\mathrm{ion}$
2. $\mathrm{Formation}\mathrm{of}\mathrm{electrophile}$
3. $\mathrm{Formation}\mathrm{of}\mathrm{benzene}\mathrm{sulphonate}\mathrm{anion}$
4. $\mathrm{Formation}\mathrm{of}\mathrm{benzene}\mathrm{sulphonic}\mathrm{acid}$

Q. The reagent that gives an orange colouration with acetaldehyde is:

1. $NaHS{O}_3$
2. $I_2$
3. $2,4-DNP$
4. $N{H}_{2}OH$

Q. How many moles of Grignard reagent will be required by one mole of given compound?

1. 7
2. 6
3. 8
4. 5

Q. Which of the following procedures would be best for the preparation of phenyl benzyl ether?
$C_6{H}_{5}OC{H}_2{C}_6{H}_5$.

1. $C_6{H}_{5}Cl+C_6{H}_5{H}_2{O}^{(-)}N{a}^{(+)}$
2. $C_6{H}_5{O}^{(-)}N{a}^{(+)}+C_6{H}_{5}C{H}_{2}Cl$
3. $2C_6{H}_{5}Cl+N{a}_{2}O$
4. $2C_6{H}_{5}MgBr+C{H}_{2}O$

Q. When $HI$ is added in excess to the unsymmetrical ether, it yields:

1. $PhC{H}_{2}OH$
2. $PhI$
3. $HOC{H}_{2}C{H}_{2}Ph-N{O}_2$
4. $IC{H}_{2}C{H}_{2}PhN{O}_2$

Q. Fehling's solution can make distinction between :

1. ${CH}_{3}CHO$ and $C_6{H}_{3}CHO$
2. ${CH}_{3}CHO$ and ${CH}_3\underset{\begin{array}{c}\parallel \\ O\end{array}}{C}{CH}_{2}OH$
3. ${CH}_3\underset{\begin{array}{c}\parallel \\ OH\end{array}}{CHC}\underset{\begin{array}{c}\parallel \\ O\end{array}}{{CH}_3}$ and $HCHO$
4. ${CH}_{3}CHO$ and $HCHO$