Hydroboration Oxidation

Q.

What is meant by hydroboration-oxidation reaction? Illustrate it with an example.

Q. Which of the following alcohols give immediate turbidity with Lucas reagent?

1. 2-Methyl-propanol
2. 2-Methyl-2-butanol
3. 3-Methyl-2-butanol
4. 2-Methyl-1-butanol

Q.

The salicylic acid reacts with the neutral FeCl3 solution and with CH3OH in esterification reaction because it contains:

1. Both an acid group and an alcoholic group
2. Both an acid group and an aldehydic group
3. Both an acid group and a phenolic group
4. Both an acid and ester group

Q. Propan-1-ol can be prepared from propene by alcohol

1. H₂O/ H₂SO₄
2. Hg(OAc)₂/H₂O followed by NaBH₄
3. B₂H₆ followed by H₂O₂
4. CH₃CO₂H / H₂SO₄

Q. Which of the following have highest boiling point? (i) 0.1m NaCl (ii) 0.05m HCl (iii) 0.1m MgCl2 (iv) 0.05 AlCl3

Q.

What is produced when ${\mathrm{CH}}_3{\mathrm{CONH}}_2$ reacts with $\mathrm{NaOBr}$? Is $\mathrm{NaOBr}$ a product of (or equivalent to) ${\mathrm{Br}}_2+\mathrm{NaOH}$ which are used in the Hoffmann bromamide degradation reaction?

Q. lowering of vapour pressure for 1 molal aqueous solution is 1.08 mm of Hg at 298 K. The vapour pressure of pure liquid at 298 K is 10x mm of Hg. The value of x will be, assuming very dilute aqueous solution

Q. Suggest the reagents for the following conversion.

1. Hg(OAc)₂, H₂O, NaBH₄

2. B₂H₆/ether, H₂O, H₂O₂/OH^-

3. H₂O/$H^{+}$

4. Grignard reagent

Q. 48. A first order reaction is 15% completed in 20 minutes. How long will it take to complete 60% (112.76min)

Q. For 1st order reaction A→ Product , the rate of reaction at \begin{bmatrix}A\end{bmatrix}=0.2 M is 1X10^{-3} mol /lLs. when will it be 75% completed?

Q.

Name the reaction when an alkyl halide is treated with alcoholic potassium hydroxide.

Q. The end product in the following sequence of reaction is
$$HC\equiv CH\underset{HgS{O}_4}{\overset{H_{2}S{O}_4}{\to }}A\underset{H_{2}O}{\overset{C{H}_{3}MgX}{\to }}B\stackrel{PCC}{\to }$$

1. 
   Acetic acid
2. 
   Isopropyl alcohol
3. 
   Acetone
4. 
   Ethanol

Q. Which of the following does not give iodoform test?

1. n-Butyl alcohol
2. sec-Butyl alcohol
3. Acetophenone
4. Acetaldehyde

Q. Two liquids A and B mixed in 1:4 mole ratio to form an ideal solution.If pure liquid A and B exerts a pressure of 75mmHg and 22mmHg respectively, the vapour pressure of liquid A in the vapour phase would be

Q. 38 If at certain temperature the vapour pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5mm of Hg, the molality of solution is (1)0.02 (2)1.2 (3)1.11 (4)0.08 (5)0.06

Q. The relative order of esterification of alcohols is :-

1. $1^{\circ }<2^{\circ }<3^{\circ }$
2. $1^{\circ }>2^{\circ }>3^{\circ }$
3. $1^{\circ }>3^{\circ }>2^{\circ }$
4. $1^{\circ }<3^{\circ }<2^{\circ }$

Q.

What is meant by hydroboration-oxidation reaction? Illustrate it with an example.

Q. 36.time of 75 percent reaction is thrice of time of 50 percent reaction. then the order of the reaction is

Q. In the following reactions:

Compound X is:

1. 
2. 
3. 
4. 

Q. A compound is heated with zinc dust and ammonium chloride followed by addition of the Tollen's reagent. Formation of silver mirror indicates the presence of following group?

1. $-N{O}_2$
2. 
3. $-CHO$
4. $N{H}_2$

Q. Suggest the reagents for the following conversion.

1. Hg(OAc)₂, H₂O, NaBH₄

2. B₂H₆/ether, H₂O, H₂O₂/OH^-

3. H₂O/$H^{+}$

4. Grignard reagent

Q.

When Hydrogen is added to Ethylene (Ethene) in the presence of nickel $2000-{3000}^{\circ }\mathrm{C}$, which product is formed?

Q.

Ozonolysis of alkenes gives ozonide which gives aldehydes and/or ketones. When a stream of $O_3$ is passed through a solution of alkene in an inert solvent at low temperature, the molecule adds up to form ozonide. This ozonide is unstable and easily decomposes either by reduction or hydrolysis and forms compound having the carbonyl group $>C=O$. This is known as ozonolysis. 2-Methyl-but-2-ene on ozonolysis followed by reductive hydrolysis gives:

1. 2 moles of $C{H}_{3}CHO$

2. 1 mole of acetone and one mole of acetaldehyde

3. 1 moles of $C{H}_{3}CHO$

4. 2 moles of $C{H}_{3}COC{H}_3$

Q. Baeyers reagent is $KMn{O}_4$ in which medium?

1. Alkaline
2. Acidified
3. Neutral
4. Alkaline and acidified both

Q. Name the reagents used in the following reactions:
$\left(i\right)C{H}_3-CO-C{H}_3\stackrel{?}{\to }C{H}_3-\underset{\underset{OH}{|}}{\stackrel{\stackrel{C{H}_3}{|}}{C}}-C{H}_3$
$\left(ii\right)C{H}_3-COOH\stackrel{?}{\to }ClC{H}_2-COOH$

Q. Solution A and B are formed by dissolving certain amount of glucose and sucrose in water. Vapour pressure of these solutions are 660 and 560 mm Hg respectively at 100 degree celsius. Ratio of molality of solutions A and B will be - (1) 14/13 (2) 33/14 (3) 15/35 (4) 35/15

Q.

What is the relationship between average rate of reaction and instantaneous rate of reaction?

1. 

2. 

3. 

4. 

Q. An aromatic compound X, $C_7{H}_{7}Cl$ on oxidation gives an aromatic compound Y. The soda-lime decarboxylation of Y gives benzene. X is

1. O – Cholorotoluene
2. P – Cholorotoluene
3. Benzyl Chloride
4. M – Cholorotaluene

Q.

Ethanol reacts with sodium and forms two products. These are

1. Sodium ethanoate and Hydrogen

2. Sodium ethanoate and Oxygen

3. Sodium ethoxide and Hydrogen

4. Sodium ethoxide and Oxygen

Q. 7. For first order reaction as time duration goes from 10 minute to 30 minute rate of reaction decreases from 0.4 to 0.04M sec. What is the half life of the reaction?