Nitration of Aromatics

Q.

Arrange the compounds of each set in order of reactivity towards S_N2 displacement:

(i) 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

(ii) 1-Bromo-3-methylbutane, 2-Bromo-2-methylbutane, 3-Bromo-2- methylbutane

(iii) 1-Bromobutane, 1-Bromo-2, 2-dimethylpropane, 1-Bromo-2-methylbutane, 1-Bromo-3-methylbutane.

Q.

Which compound in each of the following pairs will react faster in S_N2 reaction with OH⁻?

(i) CH₃Br or CH₃I

(ii) (CH₃)₃CCl or CH₃Cl

Q. Nitrobenzene can be prepared from benzene by using a mixture of conc.$HN{O}_3$ and conc.$H_{2}S{O}_4$.In the nitrating mixture, $HN{O}_3$ acts as a

1. Base
2. Acid
3. Reducing agent
4. Catalyst

Q. The -COOH group in electrophilic aromatic substitution is :

1. ortho directing
2. para directing
3. ortho and para directing
4. meta directing

Q. The reaction between phenol and chloroform in the presence of aqueous $NaOH$ is?

1. nucleophilic substitution reaction
2. electrophilic addition reaction
3. electrophilic substitution reaction
4. nucleophilic addition reaction.

Q. Wilkinsons' catalyst used as a homogeneous catalyst in the hydrogenation of alkenes contains

1. Iron
2. Aluminium
3. Rhodium
4. Cobalt

Q. Is the below conversion correct
Conversion of bromobenzene Tu benzoic acid
C6h5Br+KCN = C6h5CN
C6H5CN + H3O = C6H5COOH

Q. The most reactive nucleophile among the following is: 1.CH3O– 2.C6H5O– 3.(CH3)2CHO– 4.(CH3)3CO–

Q. Consider the given reaction, percentage yield of:

1. A > C > B
2. B > C > A
3. C > B > A
4. C > A > B

Q. 1, 2-dimethylcyclohexene is treated with $B{r}_2/CC{l}_4$. The product is

1. Cis-1, 2-dibromo-1, 2-dimethylcyclohexane.
2. Trans-1, 2-dibromo-1, 2-dimethylcyclohexane
3. Both (a) and (b)
4. 3-bromo-1, 2-dimethylcyclohexene

Q. 8. What will be the order of reactivity of following towards HCN; formaldehyde Propionaldehyde Acetone Ethyl methyl ketone

Q. Aniline reacts with excess $B{r}_2/H_{2}O$ to give the major product:

1. 
2. 
3. 
4. 

Q.

In nitration reaction during the generation of nitronium ion, the role of sulphuric acid and Nitric acid are respectively

1. Lewis acid and Lewis acid

2. Lewis acid and Lewis base

3. Lewis base and Lewis acid

4. Lewis base and Lewis base

Q. 1) - Among the isomeric alkanes of molecular formula $C_5{H}_{12},$ identify the one that on photochemical chlorination yields
A) A single monochloride.

2) - Among the isomeric alkanes of molecular formula $C_5{H}_{12},$ identify the one that on photochemical chlorination yields
B) Three isomeric monochlorides.

3) - Among the isomeric alkanes of molecular formula $C_5{H}_{12},$ identify the one that on photochemical chlorination yields
C) Four isomeric monochlorides.

Q. Attacking or reactive or electrophilic species in nitration of benzene is or in the nitration of benzene with concentrated $HN{O}_3$ and $H_{2}S{O}_4$ the attack on the ring is made by

1. $N{O}_2^{-}$
2. $N{O}_2^{+}$
3. $N{O}_3^{-}$
4. $N{O}^{+}$

Q. 75 Why phenol is more reactive than toluene towards electrophilc substituion reaction

Q. Which of the following reactions gives a racemic mixture?

1. 
2. 
3. 
4. 

Q. The coordination complex chloridotris (triphenylphosphine) rhodium (l) is used in the hydrogenation of alkenes. It is also known as ________ catalyst.

1. Grubb
2. Pearlman
3. Wilkinson
4. Ziegler-Natta

Q. Which of the following doesn’t react with ethanol KCN?

1. Ethyl chloride
2. acetyl chloride
3. chlorobenzene
4. Benzaldehyde

Q. Nitration of benzene by nitric acid and sulphuric acid is

1. Electrophilic substitution reaction
2. Electrophilic addition reaction
3. Nucleophilic substitutionreaction
4. Free radical substitution reaction

Q.
What is the major product for the above reaction?

1. cis-2-butene
2. trans-2-butene
3. but-1, 3-diene
4. but-1-yne

Q.

An alkyl halide may be converted into an alcohol by?

1. Dehydrohalogenation

2. Addition

3. Substitution

4. Elimination

Q. The compound that is most reactive towards electrophilic nitration among the following is:

1. Toluene
2. Benzene
3. Benzoic Acid
4. Nitrobenzene

Q. Which of the following intermediate is formed when benzene reacts with $C{H}_{3}COCl$ in presence of anhydrous $AlC{l}_3$ ?

1. 
2. 
3. 
4. No intermediate is formed.

Q. List the following compounds in order of decreasing reactivity towards ch3o- in an sn2 reaction carried out in ch3oh:ch3f, ch3cl, ch3br, ch3i, ch3oso2cf3, 14ch3oh.

Q. Nitration of benzene by conc. nitric acid and conc. sulphuric acid is an exampe of:

1. Electrophilic substitution reaction
2. Electrophilic addition reaction
3. Nucleophilic substitutionreaction
4. Free radical substitution reaction

Q. Nitrobenzene can be prepared from benzene by using a mixture of conc. $HN{O}_3$ and conc. $H_{2}S{O}_4$
Then choose the correct statement regarding the mechansim of the reaction :

1. $H_{2}S{O}_4$ acts as a base.
2. $HN{O}_3$ acts as a base
3. Both $H_{2}S{O}_4$ and $HN{O}_3$ acts as acids.
4. None of the above

Q. among the following the most reactive towards alc KOH is 1)CH2=CHBr 2)Ch3CoCh2CH2Br (3)Ch3Ch2Br (4)CH3CH2Ch2B

Q. what effect temperature play on carbocation rearrangement

Q. Nitrobenzene can be prepared from benzene by using a mixture of conc. $HN{O}_3$ and conc. $H_{2}S{O}_4$. In the nitrating mixture, $HN{O}_3$ acts as:

1. An acid
2. A base
3. A reducing agent
4. A catalyst