Sandmeyer Reaction

Q.

What is Barfoed’s test?

Q.

Name the gas used in holmes signal and how.

Q. Assertion: Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.

Reason: Phosphorus chlorides give pure alkyl halides.
[1 Mark]

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is NOT the correct explanation of A
3. A is true but R is false
4. Both A and R are false

Q. 8. If a reactant A is tetramerised, then the vant Hofffactor (i) is equal to1(1) 0.75(2) 0.20(4) 0.25(3) 0.15

Q. Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains

1. Mixture of o - and p - bromoanilines
2. Mixture of o - and m - bromotoluenes
3. Mixture of o - and p - bromotoluenes
4. Mixture of o - and p – dibromobenzenes

Q.

Conversion of Chlorobenzene to 1-Chloro-4-methylbenzene is

1. Wurtz reaction

2. Swarts reaction

3. Wurtz-Fittig reaction

4. Friedel-Crafts reaction

Q.

The conversion of primary aromatic amines into diazonium salts is known as:

1. Displacement

2. Diazotisation

3. Alkylation

4. Acylation

Q. Diazonium salts +,

the reaction is known as

1. Chlorination
2. Perkin reaction
3. Substitution reaction
4. Sandmeyer’s reaction

Q. 47 Write the following naming reactions. 1) Wurtz Fittig reaction 2)Fittig reaction

Q. The reagent used in Rosenmund reduction is:

1. $LiAl{H}_4$
2. $NaB{H}_4$
3. $H_2,Pd-BaS{O}_4$
4. Zinc amalgam and conc. $HCl$

Q. The compound Q is

1. benzyl bromide
2. chlorobenzene
3. benzyl chloride
4. bromobenzene

Q. When a mixture of calcium acetate and calcium formate is dry distilled, the possible product(s) formed is/are :-

1. ethanal
2. butanone
3. methanal
4. acetone

Q.

Assertion: Chemical combinations always take place between two elements.

Reason: A single substance is formed in a combination reaction.

1. If both assertion and reason are true and the reason is the correct explanation of assertion.

2. If both assertion and reason are true but the reason is not the correct explanation of assertion.

3. If the assertion is true but the reason is incorrect.

4. If the assertion is incorrect but the reason is correct.

Q. On treating Aniline with nitrous acid and HCl at $0-5^{\circ }C$ gives

1. An alcohol
2. Diazonium salt
3. Aniline hydrogen chloride
4. Nitro Aniline

Q. Give product for following reaction:

1. 
2. None of these
3. 
4. 

Q.

The benzene diazonium chloride needed for the sandmeyer reaction to produce aromatic halides is produced by diazotisation reaction that takes place at

1. 0-5⁰C

2. 5-10⁰C

3. 10-15⁰C

4. 15-20⁰C

Q. Diazomethane reacts with acid chloride followed by Ag2o and hydrolysis to produce

Q. Assertion :Benzaldehyde does not undergoes aldol condensation. Reason: Benzaldehyde does not contain acidic $\alpha$-Hydrogen.

1. Statement - I is True, Statement-II is True ; Statement-II is a correct explanation for Statement-I
2. Statement-I is True, Statement-II is True ; Statement-II is NOT a correct explanation for Statement-I
3. Statement-I is True, Statement-II is False.
4. Statement-I is False, Statement-II is True.

Q. Why pyridine only is used as a base and not other bases in the acetylation of alcohols

Q. Acetamide is treated with the following reagents separately. Which one of these would yield methylamine?

1. $NaOH-B{r}_2$
2. $\text{Sodalime}$
3. $PC{l}_5$
4. $\text{Hot conc.}{H}_{2}S{O}_4$

Q. Explain the following named reactions:

Q. 24. Why the O-nitrophenol as the major product of the reaction of dil.HNO3 with alcohol in elactrophilic aromatic substitution

Q. Conversion of benzene diazonium chloride to chlorobenzene is:

1. Stephen's reaction
2. Gomberg reaction
3. Sandmeyer's reaction
4. Schotten-Baumann reaction

Q.

Give the chemical properties of sulphuric acid with complete reaction.

Q. How will you prepare chlorobenzene from benzene diazonium chloride?

Q. $C_6{H}_5{N}_{2}Cl\underset{HCl}{\overset{CuCl}{\to }}{C}_6{H}_{5}Cl$

1. Gattermann's reaction
2. Sandmeyer's reaction
3. Frankland's reaction
4. Wurtz's reaction

Q. The carboxylic acids react with hydrazoic acid to form a primary amine. This reaction is called as :

1. Schmidt reaction
2. Curtius rearrangement
3. Schotten-Boumann reaction
4. Lossen rearrangement

Q. Which of the following reaction represents Schmidt reaction?

1. $C_2{H}_{5}COOH+H{N}_3\stackrel{conc.H_{2}S{O}_4}{\to }{C}_2{H}_{5}N{H}_2+C{O}_2+N_2$
2. $C_2{H}_{5}CO{N}_3\stackrel{heat}{\to }{C}_2{H}_{5}NCO\stackrel{H_{2}O}{\to }{C}_2{H}_{5}N{H}_2$
3. $C{H}_3-C{H}_2-N=C=O+2KOH\to C_2{H}_{5}N{H}_2+K_{2}C{O}_3$
4. $C{H}_{3}CHO+N{H}_3+H_2\stackrel{Ni{150}^{0}C300atm}{\to }{C}_2{H}_{5}N{H}_2+H_{2}O$

Q. Conversion of benzene diazonium chloride to chlorobenzene is an example of which of the following reactions?

1. Claisen
2. Friedel-craft
3. Sandmeyer
4. Wurtz

Q. In order to convert aniline into chlorobenzene, the reagents needed are:

1. $CuCl$
2. $Na{NO}_2/HCl$ and $CuCl$
3. ${Cl}_2/C{Cl}_4$
4. ${Cl}_2/Al{Cl}_3$