Reactions of Haloarenes with Metals

Q.

Galena is an ore of

1. Zinc

2. Lead

3. Mercury

4. Tin

Q.

What happens when chlorine gas is passed in an aqueous solution containing sodium iodide?

Q. Reduction of aldehydes and ketones into hydrocarbon using zinc amalgam and conc. HCl is called:

1. Clemmensen reduction
2. Stephen reduction
3. Wolf-Kishner reduction
4. None of the above

Q. why vinyl chloride doesnot form grignard reagent on reaction with mg in the prescence of ether

Q. Fluorobenzene can be synthesised in the laboratory by :

1. from aniline by diazotisation followed by heating the diazonium salt with $HB{F}_4$.
2. By direct fluorination of benzene with $F_2$ gas.
3. By reacting bromobenzene with NaF solution.
4. By reacting phenol with HF and KF.

Q. 41. What is Zeises salt, Ferrocene and Dibenzene chromium? Explain the structure of these.

Q.

Biphenyl is obtained by treating chlorobenzene with Na metal in presence of ether, the reaction is called as :

1. Wurtz reaction

2. Fittig reaction

3. WurtzFittg reaction

4. None

Q.

The preparation of ethane by electrolysis of aqueous solution of potassium acetate is

1. Grignard reaction

2. Kolbe’s synthesis

3. sabatier-senderen’s reaction

4. wurtz reaction

Q. Which of the following is an example of Sandmeyer's reaction?

1. $C_6{H}_5{N}_2^{+}C{l}^{-}\stackrel{C{u}_{2}C{l}_2}{\to }{C}_6{H}_{5}Cl$
2. $C_6{H}_5{N}_2^{+}C{l}^{-}\stackrel{H_{2}O}{\to }{C}_6{H}_{5}OH$
3. $C_6{H}_5{N}_2^{+}C{l}^{-}\stackrel{KCN}{\to }{C}_6{H}_{5}CN$
4. None of the above

Q. ntWhat is the major product formed when but-2-enal is treated with lithium aluminium hydride in dry ether solvent?n ntCH3-CH=CH-CHO + LiAlH4/dry ether → ?n

Q.

CaC₂ $\stackrel{\mathrm{Hydrolysis}}{\to }$ A $\stackrel{{\mathrm{HgSO}}_{4_{}}+\mathrm{Dil}{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }$ B

Identify A and B.

Q. 42 Why diphenyl Ether does not react with hydrogen iodide?

Q.

A double displacement reaction involves the breaking of old bonds and the formation of new bonds. Do you agree? Justify your answer with an example.

Q. 13. Pthalamide when reacts with (Br2+KOH ) in presence of H+ , what is the major product?

Q. What is The role of Positive Kernel In forming metallic bonds

Q.

What happens when ${\mathrm{CO}}_2$ gas is passed through lime water for a long time?

Q.
In the above reaction sequence, $D$ is:

1. 
2. 
3. 
4. 

Q. Chlorobenzene on treatment with sodium in dry ether gives diphenyl. The name of the reaction is ?

1. fittig reaction
2. Sandmeyer reaction
3. Wurtz.Fittg reaction
4. Gattermann reaction

Q. The structure of product C, formed by the following sequence of reaction is :

\( CH _{3} COOH + SOCl _{2} \longrightarrow A \stackrel{\text { Benzene }}{ AlCl _{3}} \rightarrow B \frac{ KCN }{- OH } \rightarrow C \)

Q. R-CO-R REACTING WITH CONC.H2SO4 GIVES ? R-CO-R REACTING WITH DIL. H2SO4 GIVES ? R-OH REACTING WITH CONC.H2SO4 GIVES ? R-OH REACTING WITH DIL.H2SO4 GIVES ? SYMMETRICAL ETHER REACTING WITH HI GIVES ? UNSYMMETRICAL ETHER REACTING WITH HI GIVES ?

Q. 15 A compound C( molecular formula C2H4O2) reacts with Na metal to form a compound R and evolves a gas which burns with pop sound. Compound C in treatment with an alcohol A in presence of an acid forms a sweet smelling compound S( molecular formula C3H6O2) on addition of NaOH to C it also gives R and water. S on treatment with NaOH solution gives back R and A. A) identity C, R, A and S. B) write the reaction for compound S formed?

Q. Which of following statements about sulphur is wrong

1. molecule is paramagnetic
2. The vapour at consists mostly of rings
3. At the gas consists of molecules
4. The oxidation state of sulphur is never less that the is its compounds

Q.

Give one example of a double decomposition reaction that is accompanied by the evolution of gas..

Also, suggest one chemical test to identify the evolved gas.

Write relevant chemical reactions in support of your answer.

Q. Which of the following will not give Claisen condensation product?

1. $(C{H}_3{)}_{3}CCOOEt$
2. $H_{2}C=CHC{H}_{2}C{H}_{2}COOEt$
3. $C_6{H}_{5}C{H}_{2}COOEt$
4. $(C{H}_3{)}_{2}CHC{H}_{2}COOEt$

Q. Explain the Wurtz-Fittig reaction.

Q. What is the product of the following reaction
$Ca{C}_2+C{H}_{3}C{H}_{2}Cl\left(excess\right)\to$

1. $1-butyne$
2. $3-hexyne$
3. $Cl-C\equiv C-Cl$
4. $Ca(C_2{H}_5{)}_2$

Q. What is Stephens reaction which is used for preparation of ketones in alehyde ketones chapte

Q. Explain Wurtz-Fitting reaction.

Q. Halo arenes undergo Wurtz-Fitting reaction.
(i) What is Wurtz-Fitting reaction?

Q. A mixture of two organic compounds was treated with sodium metal in ether solution. Isobutane was obtained as a product. The two chlorine compounds are:

1. methyl chloride and propyl chloride
2. methyl chloride and ethyl chloride
3. isopropyl chloride and ethyl chloride
4. isopropyl chloride and Methyl chloride