Preparation of Alcohols from Grignard Reagents

Q.

Give structures of the products you would expect when each of the following alcohol reacts with (a) HCl-ZnCl₂ (b) HBr and (c) SOCl₂.

(i) Butan-1-ol

(ii) 2-Methylbutan-2-ol

Q. If $20.0\text{g}$ of $CaC{O}_3$ is treated with $20.0\text{g}$ of $HCl$, how many grams of $C{O}_2$ can be obtained according to the following reaction:
$CaC{O}_3\left(s\right)+2HCl\left(aq\right)⟶CaC{l}_2\left(aq\right)+H_{2}O\left(l\right)+C{O}_2\left(g\right)$

1. $8.80\text{g}$
2. $27.4\text{g}$
3. $4.20\text{g}$
4. $13.7\text{g}$

Q. The value of rate constant of a pseudo first order reaction ____________.

1. depends only on temperature.
2. depends on the concentration of reactants present in small amounts.
3. is independent of the concentration of reactants.

4. depends on the concentration of reactants present in excess.

Q.

Show how are the following alcohols prepared by the reaction of a suitable

Grignard reagent on methanal?

(i)

(ii)

Q.

In this reaction, ${\mathrm{CH}}_3\mathrm{COONa}+\mathrm{NaOH}\stackrel{\mathrm{CaO}}{\to }$the gas obtained is

1. ${\mathrm{C}}_2{\mathrm{H}}_6$

2. ${\mathrm{C}}_2{\mathrm{H}}_2$

3. ${\mathrm{CH}}_4$

4. ${\mathrm{C}}_3{\mathrm{H}}_8$

Q. For and elementary reaction 2A B, the rate of disappearance of A is equal to :- (1) 2k1[A]2 + 2k2[B] (2) 2k1[A]2 – 2k2[B] (3) 2k1 – k2[A]

Q. 50. The bromination of acetone that occurs in acid solution is represented by this equation CH3COCH3(aq)+Br2(aq)__>CH3COCH2Br(aq)+H(aq)+Br-(aq) These kinetic dara were obtained for a given reaction concentration

Q.

Acetone reacts with Grignard reagent to form:

1. $3^{°}\mathrm{alcohol}$

2. $2°\mathrm{alcohol}$

3. Ether

4. No reaction

Q.

What is the end product when ${\mathrm{CH}}_3{\mathrm{CONH}}_2$reacts with ${\mathrm{Br}}_2+\mathrm{KOH}$?

1. ${\mathrm{CH}}_3{\mathrm{CH}}_2-{\mathrm{NH}}_2$

2. ${\mathrm{CH}}_3\mathrm{Br}$

3. ${\mathrm{CH}}_3\mathrm{CONHBr}$

4. ${\mathrm{CH}}_3{\mathrm{NH}}_2$

Q.

Complete the equation:

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{ONa}+{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}\to$

Q. Benzene reacts with n - propyl chloride in the presence of anhydrous $AlC{l}_3$ to give predominatly:

1. n - propylbenzene
2. Isopropylbenzene
3. 3 - propyl - 1- chlorobenzene
4. 2 - Propyl - 1 - chlorobenzene

Q.

Name the product which is obtained on oxidation of sodium borohydride by iodine

Q. The reaction of compound P with $C{H}_{3}MgBr$(excess) in $(C_2{H}_5{)}_{2}O$ followed by addition of $H_{2}O$ gives Q. The compound Q on treatment with $H_{2}S{O}_4$ at $0^{\circ }C$ gives R. The reaction of R with $C{H}_{3}COCl$ in the presence of anhydrous $AlC{l}_3$ in $C{H}_{2}C{l}_2$ followed by treatment with $H_{2}O$ produces compound S [Et in compound P is ethyl group]


The reactions, Q to R and R to S, are:

1. Dehydration and Friedel-Crafts acylation
2. Aromatic sulfonation and Friedel-Crafts acylation
3. Friedel-Crafts alkylation, dehydration and Friedel-Crafts acylation
4. Friedel-Crafts alkylation and Friedel-Crafts acylation

Q.

What is enolization reaction?

Q. The catalyst used in the manufacture of methanol from water gas is

Q. Benzaldehyde reacts with $C{l}_2$ in presence of $FeC{l}_3$ to give major product as:

1. o-Chlorobenzaldehyde
2. p-Chlorobenzaldehyde
3. m-Chlorobenzaldehyde
4. (a) and (b) above.

Q. following mechanism has proposed for reaction 2A+B→ D+E A+B→ C+D\cdot\cdot\cdot\cdot\cdot\cdot\cdot(slow) A+C→ E\cdot\cdot\cdot\cdot\cdot\cdot\cdot\cdot\cdot\cdot(fast) the rate law expression for the reaction

Q.

When 3-methylbutan-2-ol is treated with HBr, the following reaction takes

place:

Give a mechanism for this reaction.

(Hint : The secondary carbocation formed in step II rearranges to a more

stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.

Q.

When methyl iodide is heated with ammonia, the product obtained is

1. Methylamine

2. Dimethylamine

3. Trimethylamine

4. All of the above.

Q. Hydrolysis of isocyanate gives

1. Nitrile and $O_2$
2. Amine and $C{O}_2$
3. Amine and $N_2$
4. Amide

Q.

What would you see, when ethyne is bubbled through a solution of Bromine in Carbon tetrachloride?

Q. Consider all possible isomeric ketones including stereoisomers of MW = 100. All these isomers are independently reacted with $NaB{H}_4$. The total number of ketones that gives a racemic product(s) is/are___

Q. Dry distillation of calcium formate produces:

1. $C{H}_{3}OH$
2. $C{H}_{3}CHO$
3. $HCHO$
4. $Noneofthese$

Q. Major product obtained when propanone reacts with methylmagnesium bromide followed by hydrolysis.

1. 2-methyl-propan-2-ol
2. propane
3. 1-butene
4. 2-butanol

Q. Formaldehyde gives an additive product with methyl magnesium iodide which on aqueous hydrolysis yields:

1. ethyl iodide
2. ethyl alcohol
3. methyl alcohol
4. methyl iodide

Q. Match the following reactants in Column I with the corresponding reaction products in Column II.

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \left(A\right)& \text{Benzene}& \left(i\right)& \text{Benzoic acid}\\ & +C{l}_2\stackrel{AlC{l}_3}{\to }& & \\ \left(B\right)& \text{Benzene}& \left(ii\right)& \text{methyl}\\ & +C{H}_{3}Cl\stackrel{AlC{l}_3}{\to }& & \text{phenyl}\\ & & & \text{ketone}\\ \left(C\right)& \text{Benzene}& \left(iii\right)& \text{Toluene}\\ & +C{H}_{3}COCl\stackrel{AlC{l}_3}{\to }& & \\ \left(D\right)& +C{H}_{3}COCl\stackrel{KMn{O}_4/NaOH}{\to }& \left(iv\right)& \text{Chlorobenzene}\\ & & \left(v\right)& \text{Benzene}\\ & & & \text{hexachloride}\end{array}$

Q. Identify the product.

$C{H}_3-CH=C{H}_2+NOCl\to P$

1. 
2. 
3. 
4. 

Q. 66. A first order reaction completes 60% in 20 min. The time required for the completion of 90% of the reaction is ?

Q.

An organic compound A reacts with methyl magnesium iodide to form an addition product, which on hydrolysis forms the compound B. Compound B gives blue coloured salt in Victor-Meyer test. The compounds A and B respectively are

1. acetaldehyde and tertiary butyl alcohol

2. acetaldehyde and ethyl alcohol

3. acetaldehyde and isopropyl alcohol

4. acetone and isopropyl alcohol

Q. 5. Which of the following will have three stereoisomeric forms :- (i) [Cr(NO3)3(NH3)3] (ii) K3[Co(C2O4)3] (iii) K3[CoCl2(C2O4)2] (iv) [Co BrCl(en)2] (1) iii, iv (2) i, ii and iv (3) Only iv (4) All