Nucleophilic Substitution in Alkyl Halides

Q.

Which one is most reactive towards SN¹ reaction?

1. C₆H₅CH₂Br

2. C₆H₅CH(Br)C₆H₅

3. C₆H₅CH(CH₃)Br

4. C₆H₅C(CH₃)(C₆H₅)Br

Q. Which among the following compounds will undergo $S_{N}2$ reaction at the fastest rate ?

1. $({\mathrm{CH}}_3{)}_3\mathrm{CCl}$
   
2. $({\mathrm{CH}}_3{)}_2\mathrm{CHCl}$
   
3. ${\mathrm{CH}}_3\mathrm{Cl}$
   
4. ${\left(C_2{H}_5\right)}_2\mathrm{CHCl}$
   

Q. Which of the following is most reactive towards nuclephilic substitution reaction?

1. CH₂ = CH–Cl
2. CH₃CH = CHCl
3. C₆H₅Cl
4. ClCH₂–CH = CH₂

Q.

What are the uses of dihydrogen?

Q.

Which of the following alkyl halides will undergo $S_{N}1$ reaction most readily?

(a) $(C{H}_3{)}_{3}C-F$ (b)$(C{H}_3{)}_{3}C-Cl$ (c) $(C{H}_3{)}_{3}C-Br$ (d) $(C{H}_3{)}_{3}C-I$

Q.

Write the reaction for the conversion of ethene to ethane?

Q. Which of the following compounds has the most acidic nature?

1. 
2. 
3. 
4. 

Q. Toluene reacts with chlorine in the presence of light to give

1. benzoyl chloride
2. p – chlorotoluene
3. O – chlorotoluene
4. benzyl chloride

Q. The strongest acid amongst the following compounds is

1. $C{H}_{3}C{H}_{2}CH\left(Cl\right)C{O}_{2}H$
2. $ClC{H}_{2}C{H}_{2}C{H}_{2}COOH$
3. $C{H}_{3}COOH$
4. $HCOOH$

Q.

Which of the following has the shortest C-Cl bond ?

1. $\mathrm{Cl}-\mathrm{CH}={\mathrm{CH}}_2$

2. $\mathrm{Cl}-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

3. $\mathrm{Cl}-\mathrm{CH}=\mathrm{CH}-{\mathrm{OCH}}_3$

4. $\mathrm{Cl}-\mathrm{CH}=\mathrm{CH}-{\mathrm{NO}}_2$

Q.

${\mathrm{Mg}}_2{\mathrm{C}}_3$ reacts with water to form Propyne. ${\mathrm{C}}_3^{4-}$has

Q. Reaction between benzaldehyde and acetophenone in presence of dilute $NaOH$ is known as:

1. Cross Cannizzaro's reaction
2. Cross Aldol condensation
3. Aldol condensation
4. Cannizzaro's reaction

Q.

Give some uses of dihydrogen.

Q.

Which is faster SN1 or SN2?

Q.

Give the chemical reaction between Acetyl chloride and Dimethyl cadmium.

Q. Which of the following amines can be prepared by Gabriel synthesis?

1. $N-$Methylbenzylamine
2. $2-$Phenylethylamine
3. Isobutyl amine
4. Aniline

Q. On treating a mixture of two alkyl halides with sodium metal in dry ether, $2-\text{methyl propane}$ was obtained as one of the products. The alkyl halides are:

1. $\text{1-chloropropane and chloroethane}$
2. $\text{2-chloropropane and chloroethane}$
3. $\text{2-chloropropane and chloromethane}$
4. $\text{1-chloropropane and chlorothane}$

Q.

Which of the following compounds will give racemic mixture on nucleophilic substitution by $O{H}^{-}$ ion?

(a) (i) (b) (i), (ii) and (iii) (c) (ii) and (iii) (d) (i) and (iii)

Q. Toluene, when treated with $B{r}_2/FeC{l}_3$ gives p-bromotoluene as the major product because the $C{H}_3$ group:

1. is ortho-para directing
2. is meta directing
3. deactivates the ring
4. None of the above

Q. The decreasing order of relative nucleophilicity of the following nucleophiles in a protic solvent is
$S{H}^{-},Ac{O}^{-},Ph{O}^{-},O{H}^{-},H_{2}O$

1. $S{H}^{-}>O{H}^{-}>H_{2}O>Ac{O}^{-}>Ph{O}^{-}$
2. $S{H}^{-}>O{H}^{-}>Ph{O}^{-}>Ac{O}^{-}>H_{2}O$
3. $S{H}^{-}>Ph{O}^{-}>O{H}^{-}>H_{2}O>Ac{O}^{-}$
4. $O{H}^{-}>S{H}^{-}>Ph{O}^{-}>Ac{O}^{-}>H_{2}O$

Q. The rate constant for a first order reaction is given by the following equation:
$\text{ln k}=33.34-\frac{2.0\times {10}^4}{T}K$
The activation energy for the reaciton is given by $kJ{\text{mol}}^{-1}$. (In nearest integer)
(Given: $R=8.3J{K}^{-1}mo{l}^{-1}$

Q.

Predict all the possible products for the reaction of 2-chlorobutane with alcoholic $KOH$.

1. 1-Butene
2. Cis-2-butene
3. Trans-2-butene
4. 2-Butyne

Q.

Which one of the following halogen compounds is difficult to be hydrolyzed by S_N1 mechanism?

1. Tertiary butyl chloride

2. Isopropyl chloride

3. Benzyl chloride

4. Chlorobenzene

5. Allyl chloride

Q. The best leaving group among the given options is:

1. 
2. 
3. 
4. 

Q.

The major product formed when methyl iodide reacts with sodium nitrite is

1. Nitro ethane

2. Nitro methane

3. Nitrous acid

4. Methyl nitrite

Q. 50.The empirical formula of none electrolyte is CH2O. A solution containing 3g of compound exerts the same osmotic pressure as that of 0.05M glucose solution. the molecular formula if the compound is A)CH2O B)C2H4O2 C)C4H8O4 D)C3H6O3

Q. 29. Cyclohexanone is treated with CH3MgBr followed by hydrolysis gives A . A on reaction with HBr gives B. What is B ?

Q. In the reaction $ROH+PC{l}_5\to RCl+X$ the by-product form is :

1. $H_{3}P{O}_3$
2. $POC{l}_3$
3. $H_{3}P{O}_2$
4. None of the above

Q.

What solvent is best for ${\mathbf{E}}_{\mathbf{2}}$ reaction?

Q. Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion: Acylation of amines gives a monosubstituted product whereas alkylation of amines gives polysubstituted product.

Reason: Acyl group sterically hinders the approach of further acyl groups.

1. Both assertion and reason are correct statements but reason is not the correct explanation of assertion.
2. Assertion is wrong statement but reason is correct statement.
3. Both assertion and reason are wrong.
4. Both assertion and reason are correct statements and reason is correct explanation of assertion.
5. Assertion is correct statement but reason is wrong statement.