Preparation of Haloalkanes from Alcohol

Q.

Which of the following carbocation is most stable?

(a) (b) (c)

(d)

Q.

Write the equations for the preparation of 1-iodobutane from

1 - butanol

1-chlorobutane

but-1-ene

Q. 1) - In the following pairs of halogen compounds, which compound undergoes faster $S_{N}1$ reaction?


2) - In the following pairs of halogen compounds, which compouns undergoes faster $S_{N}1$ reaction?

Q. Arrange the compounds of each set in order of reactivity towards $S_{N}2$ displacement:

A $2$-Bromo-$2$-methylbutane,
$1$-Bromopentane,
$2$-Bromopentane

B $1$-Bromo-$3$-methylbutane,
$2$-Bromo-$2$-methylbutane,
$2$-Bromo-$3$-methylbutane

C $1$-Bromobutane,
$1$-Bromo-$2$, $2$-dimethylpropane,
$1$-Bromo-$2$-methylbutane,
$1$-Bromo-$3$-methylbutane

Q. Which of following condition is suitable while producing ethanol by fermentation?

1. Using anaerobic conditions till 14% alcohol is formed
2. Using anaerobic conditions
3. Using steam at ${30}^{\circ }C$
4. Using steam at ${450}^{\circ }C$

Q. From amongst the following alcohols the one that would react fastest with conc HCl and anhydrous $ZnC{l}_2$?

1. 2-butanol
2. 2-methylpropan-2-ol
3. 2-methylpropanol
4. 1-butanol

Q.

Pthalamide on treatment with ethanolic potassium hydroxide forms potassium salt of phthalimide which on heating with alkyl halide followed by alkaline hydrolysis produces the corresponding amine. This reaction is known as:

1. Gabriel phthalimide synthesis

2. Stephen reaction

3. Etard reaction

4. Hoffmann bromamide reaction

Q. What is the major product of the following reaction? $H_{2}C=CH-C{H}_{2}OH\stackrel{HBr\left(excess\right)}{\to }Product$

1. H₂C = CH–CH₂Br
2. CH₃–CHBr–CH₂OH
3. CH₃–CHOH–CH₂OH
4. CH₃–CHBr–CH₂Br

Q.

A compound X is formed by the reaction of carboxylic acid C₂H₄O₂ and alcohol in the presence of a few drops of H₂SO₄. The alcohol on oxidation with alkaline KMnO₄ followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of (a) carboxylic acid, (b) alcohol and (c) the compound X. Also write the reaction.

Q.
The major product obtained when this alkyl halide is subjected to E2 reaction under the treatment of potassium tert-butoxide will be:

1. 
2. 
3. both (A) and (B)
4. None of these

Q.

Give a chemical equation for the reaction between ethyl alcohol and acetic acid.

Q.

Write the chemical equation for each of the following:

Addition of hydrogen to ethene

Q.

The addition of $HBr$ to 1-butene gives a mixture of products a, b and c

The mixture consists of

1. B as major, A and C as minor products

2. A and B as minor and C as major products

3. B as minor, A and C as major products

4. A and B as major and C as minor products

Q.
Consider the above reaction, the major product P formed is,
Conc. HBr \( \longrightarrow \) P" (Major Product)

Q. Which of the following doesn’t give HVZ reaction :

1. $C{H}_{3}C{H}_{2}COOH$
2. $C{H}_{3}COOH$
3. $HCOOH$
4. $C{H}_3{)}_{2}CH-OH$

Q. The compounds A and B in the following reaction are, respectively:

1. A=Benzyl alcohol,
   B= Benzyl isocyanide
2. A=Benzyl alcohol,
   B=Benzyl cyanide
3. A=Benzyl chloride,
   B=Benzyl cyanide
4. A=Benzyl chloride,
   B=Benzyl isocyanide

Q.

Which of the following alcohols on oxidation gives a ketone with same number of carbon atoms?

1. (CH₃)₃COH

2. (CH₃)₂CHCH₂OH

3. CH₃CHOHCH₂CH₃

4. CH₃CH₂CH₂CH₂OH

Q. Gabriel phthalimide reaction is used for the preparation of

1. Primary Aromatic Amines
2. Secondary Amines
3. Primary Aliphatic Amines
4. Tertiary Amines

Q.

The thionyl chloride method is preferred over hydrogen chloride or phosphorous chloride method for the preparation of haloalkanes because both the by-products (SO₂ and HCl) in this case are gases and escape leaving behind pure chloroalkane. This reaction takes place in the presence of

1. Conc. sulphuric acid

2. Phosphoric acid

3. Anhydrous zinc chloride

4. Pyridine

Q. Which of the following compound(s) will not release $C{O}_2$ on reaction with $NaHC{O}_3$?

1. Hexanol
2. Phenol
3. Acetic acid
4. Acetylene

Q. All the compounds listed in Column I react with water. Match the result of the respective reactions with the appropriate options listed in Column II.
$\begin{array}{cccc}& \text{Column 1}& & \text{Column 2}\\ \left(A\right)& (C{H}_3{)}_{2}SiC{l}_2& \left(P\right)& \text{Hydrogen halide formation}\\ \left(B\right)& Xe{F}_4& \left(q\right)& \text{Redox reaction}\\ \left(C\right)& C{l}_2& \left(r\right)& \text{Reacts with glass}\\ \left(D\right)& VC{l}_5& \left(s\right)& \text{Polymerization}\\ & & \left(t\right)& O_2\text{formation}\end{array}$

1. a
2. c
3. d
4. b

Q. Identify Z in the following reaction sequence, $C{H}_2=C{H}_2\stackrel{HBr}{\to }x\stackrel{Ag.NaOH}{\to }Y\stackrel{N{a}_{2}C{O}_3/Excess{I}_2}{\to }$

1. CH₃CH₂I
2. CHI₃
3. CH₃CHO
4. CH₃CH₂OH

Q. Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?

1. $C{H}_{3}C{H}_2-C{H}_2-OH$
2. 
3. 
4. 

Q.

A solution contains a mixture of $A{g}^{+}$ $\left(0.10M\right)$ and $H{g}^{2+}$ $\left(0.10M\right)$ which are to be separated by selective precipitation. Calculate the maximum concentration of iodine ion at which one of them gets precipitated almost completely. What percentage of that metal ion is precipitated ? $K_{sp}$:$AgI$ = $8.5\times {10}^{-17}$, $Hg{I}_2$ = $2.5\times {10}^{-26}$

1. 

2. 

3. 

4. 

Q.

In the conversion of Grignard reagent into higher aldehydes, the other compound used is

1. Ethyl formate

2. Ethyl acetate

3. HCN

4. Both A and C

Q.

In order to prepare 1-chloropropane which of the following reactants can be employed?

1. Propene and Cl₂ followed by treatment with aq. KOH
2. Propan-1-ol and SOCl₂/pyridine
3. Propene and HCl in presence of peroxide
4. Any of the above can used

Q. t-butyl chloride combine with hydroxy anion by which mechanism? (1) SN 1 (2) SN 2 (3) SE 1 (4) SE 2

Q. Dehydration of alcohol is an example of

1. addition reaction
2. elimination reaction
3. substitution reaction
   
4. redox reaction

Q.

Which of the following is not an organic compound?

1. Hexane

2. Urea

3. Ammonia

4. Ethyl alcohol

Q. In the preparations of ethyl chloride by Grooves’ method, $C{H}_{3}C{H}_{2}OH+HCl\stackrel{Anhyd.ZNC{l}_2}{\to }C{H}_{3}C{H}_{2}Cl+H_{2}O$ the main reason for using anhydrous $ZnC{l}_2$ as catalyst is that

1. it coordinates with the product CH₃CH₂Cl and
2. it helps in producing the nucleophile Cl^– from HCl
3. it coordinates with oxygen of ethyl alcohol and thus increases the leaving group ability of the –OH group
4. it absorbs water thereby pushing the equilibrium to the right