Amines as Bases

Q. Given below are two statements
Statement I:
Primary aliphatic amines react with $HN{O}_2$ to give unstable diazonium salts.
Statement II:
Primary aromatic amines react with $HN{O}_2$ to form diazonium salts which are stable even above $300\text{K}$. In the light of the above statements, choose the most appropriate answer from the options given below.

1. Statement I is incorrect but Statement II is correct.
2. Statement I is correct but Statement II is incorrect.
3. Both Statement I and Statement II are correct
4. Both Statement I and Statement II are incorrect.

Q. For which of the following compounds, can the Kjeldahl's method for nitrogen estimation be used?

1. 
2. 
3. 
4. 

Q.

Arrange the following in increasing order of their basic strength:

(i) C₂H₅NH₂, C₆H₅NH₂, NH₃, C₆H₅CH₂NH₂ and (C₂H₅)₂NH

(ii) C₂H₅NH₂, (C₂H₅)₂NH, (C₂H₅)₃N, C₆H₅NH₂

(iii) CH₃NH₂, (CH₃)₂NH, (CH₃)₃N, C₆H₅NH₂, C₆H₅CH₂NH₂.

Q. 50kg of nitrogen and 10 kg of hydrogen are mixed to produce ammonia . Calculate the ammonia formed and identify the limiting reagent in the production of ammonia in this situation .

Q.

Arrange the following:

(i) In the decreasing order of the $p{K}_b$ values
$C_2{H}_{5}N{H}_2,C_6{H}_{5}NHC{H}_3,(C_2{H}_5{)}_{2}NH$ and $C_6{H}_{5}N{H}_2$

(ii) In increasing order of basic strength:
$C_6{H}_{5}N{H}_2,C_6{H}_{5}N(C{H}_3{)}_2,(C_6{H}_5{)}_{2}NHandC{H}_{3}N{H}_2$

(iii) In increasing order of basic strength:
(a) Aniline, p-nitroaniline and p-toluidine
(b) $C_6{H}_{5}N{H}_2,C_6{H}_{5}NHC{H}_3,C_6{H}_{5}C{H}_{2}N{H}_2$

(iv) In decreasing order of basic strength in gas phase :

$C_2{H}_{5}N{H}_2,(C_2{H}_5{)}_{2}NH,(C_2{H}_5{)}_{3}NandN{H}_3$

(v) In increasing order of boiling point:

$C_2{H}_{5}OH,(C{H}_3{)}_{2}NH,C_2{H}_{5}N{H}_2.$

(vi) In increasing order of solubility in water :

$C_6{H}_{5}N{H}_2,(C_2{H}_5{)}_{2}NH,C_2{H}_{5}N{H}_2.$

Q. Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. $H_{2}S{O}_4$ followed by treatment with $NaOH$?

1. 
2. 
3. 
4. 

Q. For the following compound :


Choose the correct statement :

1. Nitrogen 1 is the most basic.
2. Nitrogen 2 is the most basic.
3. Nitrogen 3 is the most basic.
4. All nitrogens are equally basic.

Q. Arrange the following in the increasing order of basicity.

1. Pyrrole
2. Pyridine
3. Aniline
4. Benzylamine

Q.

Ain't there any trick or pneumonic to learn(remember) the electrochemical series.......

Q. 33. Phenol, when it first reacted with concentrated sulphuric acid and then with concentrated nitric acid, gives A)2, 4, 6-trinitrophenol B)o-nitrophenol C)p-nitrophenol D)nitrobenzene

Q.

Give plausible explanation for each of the following :

Why are aliphatic amines stronger bases than aromatic amines?

Q. Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?

1. $C_6{H}_{5}N{H}_2$
2. $C{H}_{3}C{H}_2–C\equiv N$
3. $C_6{H}_{5}N{O}_2$
4. $N{H}_{2}CON{H}_2$

Q. Which of the following compounds will give a positive iodoform test?
A. $C_2{H}_{5}OH$ B. $C{H}_{3}CHO$
C. $C{H}_{3}OH$ D. HCHO

1. Only compound A
2. Only compound B
3. Both A and B
4. Only compounds C and D

Q.

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are

1. $–{\mathrm{SO}}_3\mathrm{H}\mathrm{and}–\mathrm{COOH}$

2. $–{\mathrm{SO}}_3\mathrm{H}\mathrm{and}–{\mathrm{NH}}_2$

3. $–{\mathrm{NH}}_2\mathrm{and}–{\mathrm{SO}}_3\mathrm{H}$

4. $–{\mathrm{NH}}_2\mathrm{and}–\mathrm{COOH}$

Q. Carboxylic acids contain the carbonyl group but do not show nucleophilic addition reactions like aldehydes or ketones. Why?

Q.

What are acidic hydrogens? Give an example.

Q. Enol content is highest in

1. Acetophenone

2. Acetic acid
3. Acetyl acetone

4. Acetone

Q. The correct order of the basic strength of methyl substituted amines in aqueous solution is:

1. $(C{H}_3{)}_{2}NH>C{H}_{3}N{H}_2>(C{H}_3{)}_{3}N$
2. $(C{H}_3{)}_{3}N>C{H}_{3}N{H}_2>(C{H}_3{)}_{2}NH$
3. $(C{H}_3{)}_{3}N>(C{H}_3{)}_{2}NH>C{H}_{3}N{H}_2$
4. $C{H}_{3}N{H}_2>(C{H}_3{)}_{2}NH>(C{H}_3{)}_{3}N$

Q. 45 When phenol reacts with conc. nitric acid + sulphuric acid it gives 2, 4, 6- trinitro phenol and 1, 4-benzoquinone

Q.

What is the correct order of decreasing stability of following cations?

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

Q.

Sir could you please tell me what is valency factor of KMnO4.

And how to find it.

Thank you sir.

Q.

The basic character of ethyl amine, diethyl amine and triethyl amine in chlorobenzene is

1. $C_2{H}_{5}N{H}_2<(C_2{H}_5{)}_{2}NH<(C_2{H}_5{)}_{3}N$

2. $C_2{H}_{5}N{H}_2<(C_2{H}_5{)}_{3}N<(C_2{H}_5{)}_{2}NH$

3. $(C_2{H}_5{)}_{3}N<(C_2{H}_5{)}_{2}NH<C_2{H}_{5}N{H}_2$

4. $(C_2{H}_5{)}_{3}N<C_2{H}_{5}N{H}_2<(C_2{H}_5{)}_{2}NH$

Q.

Which is the strongest acid?Why?

HI, HF HCl HBr

Q.

When stearic acid reacts with polyethylene glycol what type of detergent is formed?

1. Cationic

2. Catalytic

3. Anionic

4. Non-ionic

Q. The increasing order of reduction of alkyl halides with zinc and dilute $HCl$ is

1. $R-Cl<R-Br<R-I$
   
   
2. $R-Br<R-I<R-Cl$
3. $R-Cl<R-I<R-Br$
   
   
   
   
4. $R-I<R-Br<R-Cl$
   
   

Q. Considering the basic strength of amines in aqueous solutions, which one has the smallest $p{K}_b$ value?

1. $(C{H}_3{)}_{2}NH$
2. $C{H}_{3}N{H}_2$
3. $(C{H}_3{)}_{3}N$
4. $C_6{H}_{5}N{H}_2$

Q.

What is an Anionic Surfactant?

Q. Which of the following is an example of trihydric phenol?

1. Catechol
2. Quinol
3. Pyrogallol
4. Cresol

Q.

How hyperconjugation affects acidity or basicity and stability...

Q.

Which of the following compound cannot act as Lewis base?

1. ${\mathrm{ClF}}_5$

2. ${\mathrm{PCl}}_5$

3. ${\mathrm{NF}}_3$

4. ${\mathrm{SF}}_4$