Polymerization does not occur through intermediate formation of:

Polymerization does not occur through intermediate formation of:
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Polymerization does not occur through intermediate formation of: A. carbocations B. carbonions C. free radicals D. carbenes
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Reimer-Tiemann reaction of phenol with cholorform and aqueous alkali takes place through the intermediate formation of:

Description : Reimer-Tiemann reaction of phenol with cholorform and aqueous alkali takes place through the intermediate formation of:

Last Answer : Reimer-Tiemann reaction of phenol with cholorform and aqueous alkali takes place through the ... carbanions C. carbon radicals D. carbenes

`S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate:

Description : `S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate:

Last Answer : `S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate: ... B. carbocation C. carbanion D. none of these

A substance that is not an intermediate in the formation of D-glucuronic acid from glucose is (A) Glucoss-1-p (B) 6-Phosphogluconate (C) Glucose-6-p (D) UDP-Glucose

Description : A substance that is not an intermediate in the formation of D-glucuronic acid from glucose is (A) Glucoss-1-p (B) 6-Phosphogluconate (C) Glucose-6-p (D) UDP-Glucose

Last Answer : B

Fibrinolytic therapy is based on activation of plasminogen, the inactive proteolytic enzyme of plasma that binds to fibrin during the formation of thrombosis. Activation of plasminogen to plasmin results in selective thrombolysis at the fibrin clot surface. Which of the following statement(s) is/are true concerning agents used in thrombolytic therapy? a. Streptokinase is a bacterial protein which is antigenic in humans, resulting in allergic reactions in up to l5% of cases b. Tissue plasminogen activator acts directly on plasmin without an intermediate drug–plasmin complex c. The half-life of urokinase, streptokinase, and TPA all exceed 30 minutes d. Streptokinase is significantly cheaper than urokinase or TPA

Description : Fibrinolytic therapy is based on activation of plasminogen, the inactive proteolytic enzyme of plasma that binds to fibrin during the formation of thrombosis. Activation of plasminogen to plasmin results ... TPA all exceed 30 minutes d. Streptokinase is significantly cheaper than urokinase or TPA

Last Answer : Answer: a, b, d Streptokinase is a bacterial protein produced by group C b-hemolytic streptococci. It is therefore antigenic in humans and can be associated with allergic reaction in ... one agent over the other. Streptokinase however, is markedly less expensive than either urokinase or TPA

Imputed gross rent of owner-occupied buildings is a part of - (1) capital formation (2) final consumption (3) intermediate consumption (4) consumer durable

Description : Imputed gross rent of owner-occupied buildings is a part of - (1) capital formation (2) final consumption (3) intermediate consumption (4) consumer durable

Last Answer : (2) final consumption Explanation: The figure of final private consumption expenditure includes the imputed gross rent of owner-occupied dwellings, consumption of own-account production and payment by ... of production and hence an income and is also a part of final consumption expenditure.

Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the rate-determining step. (c) The carbocation intermediate contains an sp3 hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.

Description : Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the ... hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.

Last Answer : The addition product is a frequently observed minor product.

Imputed gross rent of owneroccupied buildings is a part of (1) capital formation (2) final consumption (3) intermediate consumption (4) consumer durable

Description : Imputed gross rent of owneroccupied buildings is a part of (1) capital formation (2) final consumption (3) intermediate consumption (4) consumer durable

Last Answer : final consumption

Why is the halogenation of alkanes considered a chain reaction? (a) it occurs quickly. (b) it occurs without the generation of intermediates. (c) each step generates the reactive intermediate that causes the next step to occur. (d) the reaction allows long chains of halogenated alkanes to be formed

Description : Why is the halogenation of alkanes considered a chain reaction? (a) it occurs quickly. (b) it occurs without the generation of intermediates. (c) each step generates the reactive intermediate that causes the next step to occur. (d) the reaction allows long chains of halogenated alkanes to be formed

Last Answer : each step generates the reactive intermediate that causes the next step to occur

What is polymerization ?

Description : What is polymerization ?

Last Answer : Answer : The Greek word poly means many and meros means part or unit . Thus polymerization is the process of creating large molecules from six single molecules. That is, a reaction in which a ... the presence of little oxygen, polythene is produced by the addition of 600 - 1000 ethin molecules.

What is a polymerization reaction ?

Description : What is a polymerization reaction ?

Last Answer : In polymer chemistry, the process of forming large molecules by combining numerous molecules of the same substance or numerous molecules of more than one substance is called polymerization reaction .

polymerization Who Say ?

Last Answer : High Heat, Stressful Effect The same Of compounds Innumerable Molecules Of each other With Added Become Large Molecular Mass Prominent New Of compounds Molecules Structure To do To the process Polymerysation . _

The product of addition polymerization reaction is:

Description : The product of addition polymerization reaction is:

Last Answer : The product of addition polymerization reaction is: A. PVC B. nylon C. terylene D. polyamide

What type organic macro molecule is form polymerization reaction between amino acids?

Description : What type organic macro molecule is form polymerization reaction between amino acids?

Last Answer : This macromolecule is a protein.

What type organic macro-molecule is form polymerization reaction between amino acids?

Description : What type organic macro-molecule is form polymerization reaction between amino acids?

Last Answer : This macromolecule is a protein.

Insulin exists in polymeric forms, for polymerization it requires (A) Calcium (B) Magnesium (C) Manganese (D) Zinc

Description : Insulin exists in polymeric forms, for polymerization it requires (A) Calcium (B) Magnesium (C) Manganese (D) Zinc

Last Answer : Answer : D

Metalloenzyme-retinene for polymerization of insulin is (A) Copper (B) Zinc (C) Cobalt (D) Manganese

Description : Metalloenzyme-retinene for polymerization of insulin is (A) Copper (B) Zinc (C) Cobalt (D) Manganese

Last Answer : Answer : B

Metal required for polymerization of insulin is (A) Copper (B) Chromium (C) Cobalt (D) Zinc

Description : Metal required for polymerization of insulin is (A) Copper (B) Chromium (C) Cobalt (D) Zinc

Last Answer : Answer : D

High iodine value of a lipid indicates (A) Polymerization (B) Carboxyl groups (C) Hydroxyl groups (D) Unsaturation

Description : High iodine value of a lipid indicates (A) Polymerization (B) Carboxyl groups (C) Hydroxyl groups (D) Unsaturation

Last Answer : Answer : D

Hydrocarbons are decomposed into smaller hydrocarbons by a) reforming b) refining c) cracking d) polymerization

Description : Hydrocarbons are decomposed into smaller hydrocarbons by a) reforming b) refining c) cracking d) polymerization

Last Answer : Answer: c Explanation: Hydrocarbons are decomposed into smaller hydrocarbons by cracking while the molecular structure of the straight-run gasoline is changed by reforming.

The production of ammonia is important because it is used in the (a) manufacture of proteins by polymerization (b) preparation of soaps (c) manufacture of artificial foods (d) production of fertilizers

Description : The production of ammonia is important because it is used in the (a) manufacture of proteins by polymerization (b) preparation of soaps (c) manufacture of artificial foods (d) production of fertilizers

Last Answer : Ans:(d)

PVC is formed by polymerization of - (1) Styrene (2) Acetylene (3) Propene (4) Vinyl Chloride

Description : PVC is formed by polymerization of - (1) Styrene (2) Acetylene (3) Propene (4) Vinyl Chloride

Last Answer : (4) Vinyl Chloride Explanation: Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization.

The process involved in making soap is (1) Saponification (2) Hydrolysis (3) Condensation (4) Polymerization

Description : The process involved in making soap is (1) Saponification (2) Hydrolysis (3) Condensation (4) Polymerization

Last Answer : (1) Saponification Explanation: Saponification is a process that produces soap, usually from fats and lye. In technical teens, saponification involves base (usually caustic soda NaOH) hydrolysis ... of a carboxylate. In addition to soap, such traditional saponification processes produces glycerol.

The process of union of two or more molecules of a substance to form a large single molecule is called : (1) Fusion (2) Diffusion (3) Polymerization (4) Synthesis

Description : The process of union of two or more molecules of a substance to form a large single molecule is called : (1) Fusion (2) Diffusion (3) Polymerization (4) Synthesis

Last Answer : (3) Polymerization Explanation: Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.

Why should one always use purest monomer in free radical polymerization?

Description : Why should one always use purest monomer in free radical polymerization?

Last Answer : Ans: The impurities present in monomer may combine with free radical that slow the rate of polymerization.

What is addition polymerization ?

Description : What is addition polymerization ?

Last Answer : Ans: A chemical reaction in which monomer unit is repeated to produce a molecule without losing of molecule like water or ammonia. Ex. Polythene, Polyvinyl chloride

Teflon is prepared by the polymerization of (a) Butadiene (b) Vinyl cyanide (c) Vinyl chloride (d) Tetrafluoroethylene

Description : Teflon is prepared by the polymerization of (a) Butadiene (b) Vinyl cyanide (c) Vinyl chloride (d) Tetrafluoroethylene

Last Answer : Tetrafluoroethylene

Propyne is formed by (a) Polymerization of acetylene (b) Reaction of acetylene with methane (c) Reaction of acetylene with methyl chloride (d) Reaction of sodium acetylide with methyl chloride

Description : Propyne is formed by (a) Polymerization of acetylene (b) Reaction of acetylene with methane (c) Reaction of acetylene with methyl chloride (d) Reaction of sodium acetylide with methyl chloride

Last Answer : Reaction of sodium acetylide with methyl chloride

Which of following statements is false about propane? (a) all bond angles are 109.5° (b) each carbon is sp3 hybridized (c) the compound is combustible (d) the compound undergoes polymerization to give polypropylene.

Description : Which of following statements is false about propane? (a) all bond angles are 109.5° (b) each carbon is sp3 hybridized (c) the compound is combustible (d) the compound undergoes polymerization to give polypropylene.

Last Answer : the compound undergoes polymerization to give polypropylene.

Polymerization helps to improve the property of (A) Strength (B) Rigidity (C) Elasticity (D) All of these

Description : Polymerization helps to improve the property of (A) Strength (B) Rigidity (C) Elasticity (D) All of these

Last Answer : Answer: Option D

For obtaining vinyl chloride acetate, the method used, is (A) Addition polymerization (B) Condensation polymerization (C) Co-polymerization (D) None of these

Description : For obtaining vinyl chloride acetate, the method used, is (A) Addition polymerization (B) Condensation polymerization (C) Co-polymerization (D) None of these

Last Answer : Answer: Option C

Which one of the following polymers is obtained from condensation polymerization? (A) Phenol formaldehyde (B) Carbamide (C) Melamine-formaldehyde (D) All of these

Description : Which one of the following polymers is obtained from condensation polymerization? (A) Phenol formaldehyde (B) Carbamide (C) Melamine-formaldehyde (D) All of these

Last Answer : Answer: Option D

The method of addition polymerization is used for obtaining: (A) Polystyrene (B) Polypropylene (C) Polyvinylchloride (D) All of thesea

Description : The method of addition polymerization is used for obtaining: (A) Polystyrene (B) Polypropylene (C) Polyvinylchloride (D) All of thesea

Last Answer : Answer: Option D

In the method of condensation polymerization, (A) Low-molecular substances are removed from the high molecular substance (B) The reaction proceeds with an evolution of ammonia (C) The reaction proceeds with an evolution of hydrogen chloride (D) All of the above

Description : In the method of condensation polymerization, (A) Low-molecular substances are removed from the high molecular substance (B) The reaction proceeds with an evolution of ammonia (C) The reaction proceeds with an evolution of hydrogen chloride (D) All of the above

Last Answer : Answer: Option D

Vinca alkaloids exert antitumor activity by: A. Activating topoisomerase II to cause breaks in DNA strands B. Crosslinking DNA strands C. Inhibiting DNA mediated RNA synthesis D. Inhibiting polymerization of tubulin to form intracellular microtubules

Description : Vinca alkaloids exert antitumor activity by: A. Activating topoisomerase II to cause breaks in DNA strands B. Crosslinking DNA strands C. Inhibiting DNA mediated RNA synthesis D. Inhibiting polymerization of tubulin to form intracellular microtubules

Last Answer : D. Inhibiting polymerization of tubulin to form intracellular microtubules

Differentiate between addition and condensation polymerization process.

Description : Differentiate between addition and condensation polymerization process.

Last Answer : Differentiate between addition and condensation polymerization: Addition polymerization Condensation polymerization Produces by addition of monomers Produces by condensation of monomers Monomers must have ... multiple of monomers e.g. Polypropylene e.g. Bakelite

Explain the condensation polymerization for phenyl formaldehyde.

Description : Explain the condensation polymerization for phenyl formaldehyde. 

Last Answer : Condensation polymerization for phenol formaldehyde: Phenol formaldehyde resins are synthetic polymers obtained by the reaction of phenol with formaldehyde(Bakelite). used for the production of molded products including ... gives a methylene bridge, and the second forms an ether bridge: 

Explain addition polymerization for polystyrene.

Description : Explain addition polymerization for polystyrene.

Last Answer : Explain addition polymerization for polystyrene. Ans : Synthesis - Styrene (C6H5CH=CH2) , undergoes addition polymerization to form polystyrene , --( C6H5CH=CH2)- It is prepared by the ... is stronger than the π bond that was broken, thus it is difficult to depolymerize polystyrene. 

Restriction enzymes are used in one of these techniques: (a). Sequencing (b). Genotyping (c). RFLP (d). Polymerization

Description : Restriction enzymes are used in one of these techniques: (a). Sequencing (b). Genotyping (c). RFLP (d). Polymerization

Last Answer : Ans: (c). RFLP

Coacervates were formed by a) DNA b) Radiations c) Polymerization d) Polymerisation and aggregation

Description : Coacervates were formed by a) DNA b) Radiations c) Polymerization d) Polymerisation and aggregation

Last Answer : d) Polymerisation and aggregation

Define polymerization. Explain addition polymerization with at least one example.

Description : Define polymerization. Explain addition polymerization with at least one example.

Last Answer : Polymerization: - The process in which a large number of small molecules (monomers) linking together to form a large molecule (polymer) under specific conditions of temperature, pressure & catalyst is ... catalyst. iv) No byproduct is obtained. v) It yields polymer having linear chain structure.

In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred (A) Through a metallic wall (B) By direct contact of hot flue gas with air (C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material (D) None of these

Description : In regenerative air preheater (as practised in heating of coke ovens), the heat is transferred (A) Through a metallic wall (B) By direct contact of hot flue gas with air (C) By ... material (like chequor bricks) and then heating the air from this hot material (D) None of these

Last Answer : (C) By heating an intermediate material (like chequor bricks) and then heating the air from this hot material

Through a point in a loaded soil, the principal stress is maximum on (A) Minor principal plane (B) Intermediate principal plane (C) Major principal plane (D) None of these

Description : Through a point in a loaded soil, the principal stress is maximum on (A) Minor principal plane (B) Intermediate principal plane (C) Major principal plane (D) None of these

Last Answer : (C) Major principal plane

Assertion : In the human the temperature of scrotum is `2-2.5^(@)C` lesser then normal body temperature . Reason : Formation of sperm does not occur a

Description : Assertion : In the human the temperature of scrotum is `2-2.5^(@)C` lesser then normal body temperature . Reason : Formation of sperm does not occur a

Last Answer : Assertion : In the human the temperature of scrotum is `2-2.5^(@)C` lesser then normal body ... False . D. If both Assertion & Reason are False.

What must occur within a gene pool before the formation of new species?

Description : What must occur within a gene pool before the formation of new species?

Last Answer : Answer: Reproductive Isolation

Diabetes mellitus can occur due to all of the following except (A) Deficient insulin secretion (B) Tumour of β−cells (C) Decrease in number of insulin receptors (D) Formation of insulin antibodies

Description : Diabetes mellitus can occur due to all of the following except (A) Deficient insulin secretion (B) Tumour of β−cells (C) Decrease in number of insulin receptors (D) Formation of insulin antibodies

Last Answer : Answer : B

In human body, the cell growth and differentiation are highly controlled and regulated, but in cancer cells. (a) there is breakdown of these regulatory mechanism leading to formation of benign and malignant tumors (b) controlled cell division and over production of genetic material occur (c) RNA is mutated and produced in less amount (d) DNA is mutated and produced in less amount

Description : In human body, the cell growth and differentiation are highly controlled and regulated, but in cancer cells. (a) there is breakdown of these regulatory mechanism leading to formation of benign and malignant ... is mutated and produced in less amount (d) DNA is mutated and produced in less amount

Last Answer : Ans:(a)

During crystallisation, formation of crystal can occur in __________ solution only. (A) Saturated (B) Supersaturated (C) Under-saturated (D) All (A), (B) and (C)

Description : During crystallisation, formation of crystal can occur in __________ solution only. (A) Saturated (B) Supersaturated (C) Under-saturated (D) All (A), (B) and (C)

Last Answer : (B) Supersaturated

Following an acute inflammation, the following may occur: a. complete resolution b. abscess formation c. chronic inflammation d. all above

Description : Following an acute inflammation, the following may occur: a. complete resolution b. abscess formation c. chronic inflammation d. all above

Last Answer : all above

For union between stock and scion in grafting which one is the first to occur? (a) Formation of callus (b) Production of plasmodesmata (c) Differentiation of new vascular tissues (d) Regeneration of cortex and epidermis

Description : For union between stock and scion in grafting which one is the first to occur? (a) Formation of callus (b) Production of plasmodesmata (c) Differentiation of new vascular tissues (d) Regeneration of cortex and epidermis

Last Answer : (a) Formation of callus

During the carbonisation of coal (A) All tar is evolved at < 600°C (B) Evolution of H2 and formation of methane and aromatics occur at > 700°C (C) Hard semi-coke starts shrinking at 600°C (D) All (A), (B) and (C)

Description : During the carbonisation of coal (A) All tar is evolved at < 600°C (B) Evolution of H2 and formation of methane and aromatics occur at > 700°C (C) Hard semi-coke starts shrinking at 600°C (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)