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(A) Condensation polymeristion is called...

(A) Condensation polymeristion is called step growth polymerisation.
(R) In condensation polymerization each step produces a distinct functional group, which is independent of each other.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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(A) Addition polymerisation is also known as step growth polymerisation. (R) Addition polymers are always homo- polymers.

Which one of the following is obtained by step growth polymerization ?

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Chain initiation and chain propagation steps are involved in a) Cationic polymerization b) Anionic polymerization Free radical polymerization d) Condensation polymerization The correct answer is

Structural isomers have different covalent linkage of atoms. Stereoisomers are compounds that have same sequence of covalent bonds but differ in the relative dispositions of their atoms in space. Geometri cal and optical isomers are the two important types of configurational isomers. The compound with double bonds or ring structure have restricted rotation, so exist in two geometrical forms. The double bonds in larger rings (ring size 10 carbon large) can also cause geometrical isomerism. The optical isomers rotate the plane of plane-polarised light. A sp^(3) -hybridised carbon atom bearing four different types of substituents is called an asymmetric centre or chiral centre. A chiral object or molecule cannot be superimposed on its mirror image. Stereoisomers that are mirror images of each other are called enantiomers. The stereosomers that the pot mirror images of each other are called diastereomers. Diasteremers have different physical properties. A racemic mixture is optically inactive and contains equal amounts of both the enantiomers. Resolution refers to method of separating a racemic mixture. Into two pure enantiomers. A meso compound is an optically inactive stereoisomer, which is achiral due to the presence of an internal plane of symmetry or centre of symmetry within the molecule. The number of chiral centres present in the following compounds is

Structural isomers have different covalent linkage of atoms. Stereoisomers are compounds that have same sequence of covalent bonds but differ in the relative dispositions of their atoms in space. Geometri cal and optical isomers are the two important types of configurational isomers. The compound with double bonds or ring structure have restricted rotation, so exist in two geometrical forms. The double bonds in larger rings (ring size 10 carbon large) can also cause geometrical isomerism. The optical isomers rotate the plane of plane-polarised light. A sp^(3) -hybridised carbon atom bearing four different types of substituents is called an asymmetric centre or chiral centre. A chiral object or molecule cannot be superimposed on its mirror image. Stereoisomers that are mirror images of each other are called enantiomers. The stereosomers that the pot mirror images of each other are called diastereomers. Diasteremers have different physical properties. A racemic mixture is optically inactive and contains equal amounts of both the enantiomers. Resolution refers to method of separating a racemic mixture. Into two pure enantiomers. A meso compound is an optically inactive stereoisomer, which is achiral due to the presence of an internal plane of symmetry or centre of symmetry within the molecule. The following two compounds are

AAKASH SERIES-POLYMERS-OBJECTIVE EXERCISE - 4
  1. (A) Ethylene can not be prepared by anionic polymerisation. (R) Eth...

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  2. (A) Teflon is used in nonstick cookwere (R) Teflon is resistant to a...

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  3. (A) Condensation polymeristion is called step growth polymerisation. ...

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  4. (A) Nylon-6 is condensation homo polymer. (R) Nylon-6 is a fibre.

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  5. (A) Dacron is used as reinforcing material in safety helmets. (R) Da...

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  6. (A) Novolac is a linear polymer. (R) Bakelite is obtained from novol...

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  7. (A) Melamine is a thermosetting polymer (R) Melamine is a condensati...

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  8. (A) Melamine polymers are used to prepare unbreakable crockery items. ...

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  9. (A) Vulcanised Rubber suits industry than natural Rubber. (R) Elasti...

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  10. (A) Rubber latex is colloidal dispersion in water with negatively char...

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  11. (A) Ebonite contain a high percentage of sulphur. (R) Ebonite is a h...

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  12. (A) The process of vulcanization can be accelerated by Zno or zinc ace...

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  13. (A) Position of double bond in poly isoprene can be detected by ozonol...

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  14. (A) Neoprene is a synthetic Rubber. (R) Neoprene is obtained from ch...

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  15. (A) The P.D.I of synthetic polymer is greater than one. (R) Syntheti...

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  16. (A) P.H.B.V is used in spaciality packing. (R) P.H.B.V is a Biodegra...

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  17. (A) Biodegradable polymers are ecofriendly. (R) Biodegradable polyme...

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  18. (A) Poly glycolic acid is used as post operative sutures. (R) Poly g...

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  19. (A) Poly vinyl pyrrolidone is an addition homo polymer. (R) Poly vin...

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  20. (A) In the preparation of plexi glass acetone is used. (R) Poly meth...

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