Polymerisation of Alkynes

Q. Acetic acid dimerises in benzene solution .The value of vant Hoff factor for dimerization of acetic acid is 0.6. Find out the % dimerization of acetic acid

Q. Arrange the following in the decreasing order of acidic strength. 1. o-fluoro benzoic acid 2. o-chloro benzoic acid 3. o-bromo benzoic acid 4. o-iodo benzoic acid

Q.

What is the potential energy of an electron present in N shell of the Be³⁺ ion

Q. Why benzoic acid is stronger than acetic acid but weaker than formic acid?

Q. When ethyne is passed through a red hot tube, is formed

1. Cyclohexane
2. Methylbenzene
3. Benzene
4. Ethane

Q. Polymerisation product of propyne is

1. 1, 3, 5-trimethylbenzene
2. Ethylbenzene
3. Benzene
4. 
   Propylbenzene

Q. ntacetic acid dimerises in benzene solution, i=0.8. The % of dimerisation of acetic acid isn

Q. which of the following compounds is most acidic? a)benzoic acid b)ortho nitro benzoic acid c)para nitro benzoic acid d)meta nitro benzoic aci

Q. 17. Which of the following does not give benzoic acid on hydrolysis 1) phenyl cyanide 2) benzyl chloride 3) benzoyl chloride 4) methyl benzoate

Q. which of the following with aqueous KOH will give acetaldehyde? 1) 1, 2-dichloroethane 2) 1, 1-dichloroethane 3) Chloroacetic acid 4) Ethyl chlorid

Q. 7. acetic acid dimerisws in benzene solution.the vant Hoff factor for the dimerisation of acetic acid is 0.8 .The % of dimerisation of acetic acid is 1.)20% 2.)40% 3.)60% 4.)80%

Q. compare the acidity of o-methyl benzoic acid, o- methoxy benzoic acid , o-nitrobenzoicacid i.e. order of orthro effect for CH3, OCH3, NO2

Q. Which of the following structure contain a hemiacetal group?

1. 
2. 
3. 
4. 

Q. 43. Which compound is least acidic ? 1. Benzoic acid 2. o-chloro benzoic acid 3. o-methyl benzoic acid 4. o-nitro benzoic acid

Q.

The following cyclic polymerization is called

1. Ring synthesis

2. Phenolic Dehydration

3. Aromatization

4. Diazotisation

Q. Calculate the number of $FeS{O}_4.7H_{2}O$ formula units in $0.2$ millimoles of pure $FeS{O}_4.7H_{2}O$

1. $0.2N_A$
2. $0.0002N_A$
3. $0.002N_A$
4. $2000N_A$

Q.

74 (iii) Write the name and formula of monomer of polyethylene.

Q.

Benzene is a polymer of

1. Methane

2. Acetylene

3. Ethane

4. None of these

Q. in haber process 30l of dihydrogen and 30l of dinitrogen were taken for reaction which yielded only 50% of the expected product.What will be the composition of gaseous mixture under the aforesaid condition in the end

Q. 6. How to convert Acetaldehyde to Prop-2-enoic acid?

Q. 33. Why soul phonation of benzene is a reversible reaction

Q.

1. None of these

2. 

3. 

4. 

Q. Acetic anhydride is prepared in the laboratory by heating sodium acetate with:

1. ethyl chloride
2. conc.$H_2{SO}_4$
3. acetyl chloride
4. zinc dust

Q. Write an article of about 1000 words explaining the structure, methods of preparation, properties and isomerism in Amines.

Q. An atom has 7 electrons in its M - shell and contains 18 neutrons in its nucleus. What is its mass number

1. 22
2. 30
3. 35
4. 45

Q. Which of the following statements about Grignard reagent is false?

1. An organosodium compound is not very reactive compared to a Grignard reagent
2. Grignard reagents are prepared in ether or tetrahydrofuran (THF)
3. Grignard reagents are decomposed by water and alcohol
4. Grignard reagents (RMgBr) add to the carbonyl group of aldehydes and ketones
   

Q. The equivalent weight of a divalent metal is $W$. The molecular weight of its chloride is:

1. $W+35.5$
2. $2W+35.5$
3. $W+71$
4. $2W+71$

Q. Benzene was first synthesized by passing acetylene through iron catalyst at room temperature.

1. True
2. False

Q. Complete the missing products (X), (Y) and (Z) by making an appropriate choice.

$C{H}_{3}COOH\stackrel{PB{r}_3/B{r}_2}{\to }X\stackrel{KCN}{\to }Y\stackrel{H_3{O}^{+}}{\to }Z$

1. X	Y	Z
   $C{H}_{3}COBr$	$C{H}_{3}COCN$	$C{H}_{3}COOH$

2. X	Y	Z
   $BrC{H}_{2}COOH$	$\underset{CN}{\underset{|}{C}}{H}_2-COOH$	$HOOC-C{H}_{2}COOH$

3. X	Y	Z
   $BrC{H}_{2}COOH$	$C{H}_2\left(CN\right)COOH$	$\underset{COOH}{\underset{|}{C}OOH}$

4. X	Y	Z
   $B{r}_{2}CHCOOH$	$B{r}_{2}C\left(CN\right)COOH$	$C{H}_{3}C{H}_{3}COOH$

Q. Xylene was synthesized by passing a mixture of acetylene and propyne (2:1) through red hot tube.

1. True
2. False