Reactions of Aryl Amines (Diazo Salts)

Q.

25.4 g of iodine and 14.2 g of chlorine are made to react completely to yield a mixture of ICl and$IC{l}_3$. Calculate the number of moles of ICl and $IC{l}_3$ is formed

1. 0.1 mole, 0.2 mole

2. 0.1 mole, 0.1 mole

3. 0.5 mole, 0.5 mole

4. 0.2 mole, 0.2 mole

Q.

What is the Gattermann Reaction?

Q.

Predict the products of the following reactions:

(i)

(ii)

(iii)

(iv)

Q. Vinyl and aryl halides do not ​undergo $S_{N}1$ and $S_{N}2$ reaction. Which of the following is the correct reason behind this ?

1. Unstable Aryl cation​
2. $\pi -e^{-}$ cloud of haloarenes​
3. Partial double bond character of $C-X$ bond​
4. All of the above

Q. The increasing order of reactivity of the following bromides in $S_{N}1$ reaction is

1. III > I > II > IV
2. III > I > IV > II
3. II > III > I > IV
4. II > I > III > IV

Q.

Give simple chemical test to distinguish between the following pair of compounds $\mathrm{Pentan}-2-\mathrm{one}$ and $\mathrm{Pentan}-3-\mathrm{one}$.

Q.

Out of C₆H₅CH₂Cl and C₆H₅CHClC₆H₅, which is more easily hydrolysed by aqueous KOH?

Q.

Which of the following is the most stable diazonium salt?

1. ${\mathrm{CH}}_3{{\mathrm{N}}_2}^{+}{\mathrm{X}}^{–}$

2. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2{{\mathrm{N}}_2}^{+}{\mathrm{X}}^{–}$

3. ${\mathrm{C}}_6{\mathrm{H}}_5{{\mathrm{N}}_2}^{+}{\mathrm{X}}^{–}$

4. ${\mathrm{CH}}_3{\mathrm{CH}}_2{{\mathrm{N}}_2}^{+}{\mathrm{X}}^{–}$

Q.

How will you distinguish between primary, secondary, and tertiary amines?

Q. In polythionic acid, $H_2{S}_x{O}_6(x=3\text{to}5)$ the oxidation state(s) of sulphur is/are :

1. $0\text{and}+5\text{only}$
2. $+5\text{only}$
3. $+6\text{only}$
4. $+3\text{and}+5\text{only}$

Q. Ethanol on reaction with acetic anhydride gives-

1. Acetic ester
2. Formic ester
3. Ethanoic acid
4. Both acetic ester and ethanoic acid

Q.

Account for the following

(i) $p{K}_b$ of aniline is more than that of methyl amine.

(ii) Ethylamine is soluble in water whereas aniline is not

(iii) Methyl amine in water reacts with ferric chloride to precipitate hydrated ferric oxide

(iv) Although amino group is o- and p- directing in aromatic electrophilic substitution, aniline on nitration gives a substantial amount of m-nitroaniline

(v) Aniline does not undergo Friedel Crafts reaction

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines

Q.

Complete the following reactions:

(i) $C_6{H}_{5}N{H}_2+CHC{l}_3+alc.KOH\to$

(ii) $C_6{H}_5{N}_{2}C{l}_3+H_{3}P{O}_2+H_{2}O\to$

(iii) $C_6{H}_{5}N{H}_2+H_{2}S{O}_4(conc.)\to$

(iv) $C_6{H}_5{N}_{2}Cl+C_2{H}_{5}OH\to$

(v) $C_6{H}_{5}N{H}_2+B{r}_2\left(aq\right)\to$

(vi) $C_6{H}_{5}N{H}_2+(C{H}_{3}CO{)}_2\to$

(vii) $C_6{H}_5{N}_{2}Cl\underset{\left(ii\right)NaN{O}_2/Cu,\Delta }{\overset{\left(i\right)HB{F}_4}{\to }}$

Q. The product(s) of the following reaction sequence is/are:

1. 
2. 
3. 
4. 

Q.

Methyl Chloride reacts with Silver acetate to yield

1. Acetic Acid

2. Methyl Acetate

3. Acetyl Chloride

4. None of these

Q. Find the major product when propene reacts with diborane followed by oxidation with hydrogen peroxide in the presence of aqueous sodium hydroxide.

1. Propanol
2. Propan$-2-$ol
3. Dipropylether
4. Propanal

Q. Calculate the oxidation number of phosphorus in the following species.

A) $HP{O}_3^2-$

B) $P{O}_4^3-$

Q. Out of chlorobenzene and benzyl chloride, which one gets easily hydrolysed by aqueous NaOH and why?

Q. Why do amino acids have high melting point ?

Q.

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile, $E^{+}$
(a)Chlorobenzene, 2, 4-dinitrochlorobenzene, p-nitrochlorobenzene

(b)Toluene, $p-H_{3}C-C_6{H}_4-N{O}_2,p-O_{2}N-C_6{H}_4-N{O}_2.$

Q.

Give two examples each of deliquescent salts and efflorescent salts?

Q. Weight of NaOH required to react completely with 0.1 equivalent of H2SO4??

Q. The product formed on the reaction of chloroform with aniline and alcoholic $KOH$ is:

1. Phenyl isocyanide
2. Chlorobenzene
3. Phenol
4. Phenyl cyanide

Q.

. In the extraction of chlorine from brine _____________.

1. $E^{\circ }$ for the overall reaction has a positive value
2. $\Delta G^{\circ }$ for the overall reaction is positive

3. $\Delta G^{\circ }$ for the overall reaction is negative.

4. $E^{\circ }$ for the overall reaction has a negative value.

Q. In the diazotisation of aniline with sodium nitrite and hydrochloric acid, an excess of hydrochloric acid is used primarily to :

1. Suppress the concentration of free aniline available for coupling
2. Suppress hydrolysis of phenol
3. Insure a stoichiometric amount of nitrous acid
4. Neutralize the base liberated

Q.

Benzene diazonium chloride on reaction with KCN in the presence of CuCN yields X. X on hydrolysis gives Y. Y can also be obtained from

1. Toulene by the action of Cl₂/ FeCl₃

2. Toulene by the oxidation by KMnO₄

3. Toulene by nitration

4. Toulene by sulphonation

Q. 27. Ethyl Chloride react with aqueous KOH and the product is (a)Ethyl alcohol (b)Ethene (c)Mixture of both (d)none

Q. Among the following compounds which can be dehydrated very easily?

1. $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}C{H}_{2}OH$
2. 
3. 
4. 

Q. The major product formed on oxidation of toluene using chromyl chloride in presence of $C{S}_2$ followed by hydrolysis is

1. Benzoic acid
2. Benzaldehyde
3. $2-$Methyl phenol
4. Phenol

Q.

For the reaction$\underset{\mathrm{Hydrogen}\mathrm{gas}}{\underbrace{{\mathrm{H}}_2\left(\mathrm{g}\right)}}+\underset{\mathrm{chlorine}\mathrm{gas}}{\underbrace{{\mathrm{Cl}}_2\left(\mathrm{g}\right)}}\stackrel{\mathrm{Sunlight}}{\to }\underset{\mathrm{Hydrochloric}\mathrm{acid}}{\underbrace{2\mathrm{HCl}\left(\mathrm{l}\right)}}$. The order of the reaction is

1. $0$

2. $1$

3. $2$

4. $3$