Electrophilic Substitution Reactions of Haloarenes

Q.

State effective atomic number(EAN) rule.

Q. Phenol when first treated with concentrated ${\text{H}}_{2}S{O}_4$ and then with concentrated $HN{O}_3$ gives

1. $2,4,6-\text{Trinitrophenol}$
2. $\text{o-Nitrophenol}$
3. $\text{p-Nitrophenol}$
4. $\text{Nitrobenzene}$

Q.

Why Paras product is major and not ortho?

Q.

What is the correct sequence of reagents used for converting Nitrobenzene into m-dibromobenzene?

1. $\stackrel{\mathrm{Sn}/\mathrm{HCl}}{\to }/\stackrel{{\mathrm{Br}}_2}{\to }/\stackrel{{\mathrm{NaNO}}_2}{\to }/\stackrel{\mathrm{NaBr}}{\to }$

2. $\stackrel{\mathrm{Sn}/\mathrm{HCl}}{\to }/\stackrel{\mathrm{KBr}}{\to }/\stackrel{{\mathrm{Br}}_2}{\to }/\stackrel{{\mathrm{H}}^{+}}{\to }$

3. $\stackrel{{\mathrm{NaNO}}_2}{\to }/\stackrel{\mathrm{HCl}}{\to }/\stackrel{\mathrm{KBr}}{\to }/\stackrel{{\mathrm{H}}^{+}}{\to }$

4. $\stackrel{{\mathrm{Br}}_2/\mathrm{Fe}}{\to }/\stackrel{\mathrm{Sn}/\mathrm{HCl}}{\to }/\stackrel{{\mathrm{NaNO}}_2/\mathrm{HCl}}{\to }/\stackrel{\mathrm{CuBr}/\mathrm{HBr}}{\to }$

Q.

What happens when Benzene reacts with Bromine water?

Q. Aniline in a set of reactions yielded a product D.

The product D is:

1. $C_6{H}_{5}NHOH$
2. $C_6{H}_{5}NHC{H}_{2}C{H}_3$
3. $C_6{H}_{5}C{H}_{2}N{H}_2$
4. $C_6{H}_{5}C{H}_{2}OH$

Q. Ionisation constant of ch3cooh is 1.7 10-5

Q. Why Bromobenzene don't react with aq.NaOH ?

Q. A halogen compound A on hydrolysis with dil. alkali followed by acidification gives acetic acid. The compound A is

Q.

Conversion of chlorobenzene to a mixture of 2-chloroacetophenone and 4-chloroacetophenone Is an example of

1. Elimination reaction

2. Condensation reaction

3. Nucleophilic ring substitution

4. Electrophilic ring substitution

Q.

Which of the following is intermediate in Sandmeyer's reaction?

1. Diazonium salt

2. Nitronium ion

3. Ammonium salt

4. Hydronium ion

Q.

Which reagent (A) is used for the following given conversion?

1. $\mathrm{Cu}/∆/$high pressure

2. Molybdenum Oxide

3. Manganese Acetate

4. Potassium Permanganate

Q.

Reaction of alkyl halides with ammonia to form a mixture of primary, secondary and tertiary amine is:

1. Substitution

2. Addition

3. Ammonolysis

4. Elimination

Q. ethene +br2 in the presence of ccl4 and dark give

Q. Dihydrogen reacts with CO at 700K in the presence of a catalyst $ZnO/C{r}_2{O}_3$ to form

1. HCHO
2. 
3. 
4. 

Q. Which of the following sequence of reactions will give 1-bromo 4-trichloro methyl benzene

1. 
2. 
3. None of these
4. 

Q. 33 An aromatic compound A with molecular formula C7H5N on hydrolysis in presence of acid gives B which reacts with ammonia to give C . C on heating with P2O5 gives A back . Identify A, B, C and give the relevant chemical equations of the reactions.

Q.

Potassium chlorate on heating gives potassium chloride and oxygen.

1. True
2. False

Q.

the carbon-halogen bond has got to be broken because that gets easier as you go from fluoride to chloride to bromide to iodide, the compounds get more reactive in that order. Why then does the boiling point also increase shouldn't they decrease if its easier to break the bonds like for there reactivity.

Q. Benzene reacts with chlorine in presence of light to yield:

1. benzenehexachloride
2. chlorobenzene
3. tetrachlorobenzene
4. trichlorobenzene

Q. Which of the following is the incorrect statement concerning E1 reaction?

1. Polar protic solvent increases reactivity
2. Good leaving group favours the reation
3. Reaction proceeds via carbocation intermediates
4. Strong base is preferred for abstraction of proton

Q.

On mixing a certain alkane with chlorine and irradiating it with ultraviolet light it forms only one monochloroalkane. The alkane is:

1. Propane

2. Pentane

3. Isopentane

4. Neopentane

Q.

Method of preparation of haloarenes by electrophilic substitution reaction

Q.

When thiosulphate ion is oxidised by iodine, which one of the following ion is produced

1. 

2. 

3. 

4. 

Q. Which of the following can be used as the halide component for Friedel Crafts reaction ?

1. Bromobenzene
2. Chlorobenzene
3. Chloroethene
4. Isopropyl chloride

Q. In electrophilic aromatic substitution reactions of chlorobenzene, the ortho/para-directing ability of chlorine is due to its _______.

1. positive inductive effect $(+I)$
2. negative inductive effect $(-I)$
3. positive resonance effect $(+R)$
4. negative resonance effect $(-R)$

Q. Chlorobenzene on reaction with acetyl chloride in presence of anhydrous $AlC{l}_3$ gives major product of:

1. $2$ - chloro acetanilide
2. $2$ - chloro acetophenone
3. $3$ - chloro acetanilide
4. $4$ - chloro acetophenone

Q.

1 , 2 di-bromo cyclohexane on dehydro halogenation gives

[UPSEAT 2003]

1. 
   

2. 
   

3. 
   

4. None of these

Q.

Which of these reactions are possible?

1. A and D

2. B and D

3. B, C, and D

4. A and B

Q. \( \frac{ Br _{2}}{ FeBr _{3}} \) Majer product
(AIIMS 2018)