Free Radical Mechanism

Q.

Differentiate between buna-N and buna-S.

Q.

What is the difference between plastic and polymer?

Q.

Name the advantages of polymers.

Q. The intermediate formed when propene react with $HCl$ in presence of peroxide is

1. 
2. 
3. 
4. 

Q. SBR (GRS, Buna-S, Cold Rubber) is obtained by a free radical co-polymerisation of:

1. Buta-1, 3-diene (70%) and 30% phenyl ethane (styrene)
2. Chloroprene and styrene
3. Vinyl acetylene and styrene
4. Isoprene and 1, 3-butadiene

Q. Nylon 6, 6 is a polyamide obtained by the reaction of:

1. $COOH(C{H}_2{)}_{4}COOH+N{H}_2{C}_6{H}_{4}N{H}_2-(p)$
2. $COOH(C{H}_2{)}_{4}COOH+N{H}_2(C{H}_2{)}_{6}N{H}_2$
3. $COOH(C{H}_2{)}_{6}COOH+N{H}_2(C{H}_2{)}_{4}N{H}_2$
4. $COOH{C}_6{H}_{4}COOH-\left(p\right)+N{H}_2(C{H}_2{)}_{6}N{H}_2$

Q. convert the followuing 1 chloro propane to butanoic acid

Q. 35 Which of the following is not chiral ? a- 2-butanol b- 2, 3-dibromo pentane c- 3-bromo pentane d- 2-hydroxy propanoic acid

Q. why is phenyl a secondary radical

Q.

Why should the monomer used in addition polymerisation through free radical pathway be very pure?

Q.

Give an example of a polymerization reaction?

Q. Among the following, the branched chain polymer is :

1. Polyvinyl chloride
2. Bakelite
3. Low density polythene
4. High density polythene

Q. When acetaldol is treated with excess of acid thenunsaturated product will be :(1) Alcohol(3) Acid(2) Aldehyde(4) Alkyl halide

Q. Aniline on reaction with aqueous solution of bromine gives

1. o-Bromo aniline
2. p-Bromo aniline
3. 2, 4, 6-Tribromo aniline
4. m-Bromo aniline

Q. What happens When Benzene Diazonium Chloride reacts with Naphthol? Give Mechanism of this Reaction

Q.

Which is true regarding free radical polymerisation of Ethylene?

1. Molecular weight gain occur in propagation step of polymerisation
2. Polymerisation is involved by either peroxide initiator (or) radiation
3. polymerisation is exothermic in nature
4. All the above

Q.

Does Lactic Acid Show Optical Isomerism?

Q. Which of the following polymer is not an addition polymer?

1. BUNA-N
2. PAN
3. Teflon
4. Propylene

Q. Which is rate determining step of chain initiation step?

1. Chain propogation
2. Chain initiation
3. Initiator decomposition
4. None of the above

Q. Arrange the following in decreasing rate in $E2$ reaction

1. $1>2>3$
2. $3>1>2$
3. $3>2>1$
4. $2<3<1$

Q. Out of these which factor can affect the termination mechanism in free radical polymerisation ?

1. Type of active centre
2. Nature of monomer
3. All the above
4. Reaction condition

Q. Free radical polymerisation requires a free radical initiator. The most commonly used free radical initiator is:

1. $Ph-CO-O-O-CO-Ph,$ benzoylperoxide
2. $(C{H}_3{)}_{3}C-O-O-C(C{H}_3{)}_3$, tert - butyl peroxide
3. 
4. $C{H}_2{N}_2$, diazomethane

Q.

Which of the following is a chain growth polymer

1. Nucleic acid
2. Polystyrene
3. Protein
4. Starch

Q. SBR (GRS, Buna-S, Cold Rubber) is obtained by a free radical co-polymerisation of:

1. Buta-1, 3-diene (70%) and 30% phenyl ethane (styrene)
2. Chloroprene and styrene
3. Vinyl acetylene and styrene
4. Isoprene and 1, 3-butadiene

Q. Hexanon and CH2CHCOCH3 reaction product in presence of EtoNa and EtO

Q. Seliwanoff test and Xanthoproteic test are used for the identification of __________ and ___________ respectively

1. ketoses, proteins
2. proteins, ketoses
3. aldoses, ketoses
4. ketoses, aldoses

Q.

Write the name and structure of one of the common initiators used in free radical addition polymerization.

Q. 97.Which of the following caids forms lactide on heating with dilute acid ? (1) 3-hydroxy butanoic acid (2) 4-hydroxy butanoic acid (3)6-hydroxy hexanoic acid (4) 2-hydroxy propanoic acid

Q. The D, L system of relative configuration is not 100% correct, and hence R, S system was adopted as a defect proof, absolute configuration. The R, S system involves the following steps:
Step l: The four atoms or groups attached to the chiral carbon atom are assigned a sequence of priorities according to sequence rules.
Step ll: The arrangement of these four atoms is observed by drawing a curved arrow from the atom with the highest priority (1) to the atoms with next highest (2) and if the direction of this arrows is clockwise it indicates R configuration. While the anticlockwise direction from group (1) to group (2) indicates S configuration. However, this convention is true only when the atom with the lowest priority (4) is present on the vertical bond, in case of Fischer projection. In case, the atom (4) lies on the horizontal bond opposite configuration is assigned.
Now observe the monochlorination of 2- chlorobutane.


Priority order of some groups:
$Cl>C{H}_{2}C{H}_3>C{H}_3>H;C{H}_{2}Cl>C{H}_{2}C{H}_3,C{H}_{2}C{H}_{2}Cl>C{H}_3$

Which of the following structures can exist as mesomer?

1. B
2. D
3. E
4. None of these

Q. Assertion: LDPE is a branched polymer

Reason: It is prepared by coordination polymerization of ethylene

1. A

2. B

3. C

4. D