The pair(s) of reagents that yield paramagnetic species is/are

The pair(s) of reagents that yield paramagnetic species is/are
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The pair(s) of reagents that yield paramagnetic species is/are A. Na and excess of `NH_(3)` B. K and ... `HNO_(3)` D. `O_(2)` and 2-ethylanthraquinol
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The pair(s) of reagents that yield paramagnetic species is/are

Description : The pair(s) of reagents that yield paramagnetic species is/are

Last Answer : The pair(s) of reagents that yield paramagnetic species is/are A. Na and excess of `NH_(3)` B. K and ... `HNO_(3)` D. `O_(2)` and 2-ethylanthraquinol

The pair(s) of reagents that yield paramagnetic species is/are

Description : The pair(s) of reagents that yield paramagnetic species is/are

Last Answer : The pair(s) of reagents that yield paramagnetic species is/are A. Na and excess of `NH_(3)` B. K and ... HNO_(3)` D. `O_(2)` and 2 - ethylanthraquinol

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How would you synthesise 4-methoxyphenol from bromobenzene in not more than five steps? State clearly the reagents used in each step and show the stru

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Which of the following reagents turns white precipitate of AgCl yellow ?

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which of the following reagents will not react with above compound?

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Which of the following pairs of reagents will not form ether

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Which of the following reagents can distinguish ethyl methyl either from isopropyl alcohol ?

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Ozone on reaction with one of the following reagents uses all its 3 oxygen atoms for oxidation

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Description : The leaks in a refrigeration system using Freon are detected by (a) halide torch which on detection produces greenish flame lighting (b) sulphur sticks which on detection gives white smoke (c) using reagents (d) sensing reduction in pressure.

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(4) None of these Explanation: Catalysis is the change in rate of a chemical reaction due to the participation of a substance called a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. A catalyst may participate in multiple chemical transformations. Catalysts that speed the reaction are called positive catalysts.

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Description : Name two reagents which can be used to distinguish between ethene and ethyne.

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Explain why Grignard reagents do not reacts with alkanes.

Description : Explain why Grignard reagents do not reacts with alkanes.

Last Answer : Ans. In alkanes , the C – H bond has very little polarity . The hydrogen cannot be abstracted by the Grignard reagent.

Why are Grignard reagents soluble in ether but not in benzene ?

Description : Why are Grignard reagents soluble in ether but not in benzene ? 

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Last Answer : Fluoro dinitro benzene, dansyl chloride, phenyl iso thio cyanate.

. Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C

Description : Which of the following reagents will react with furan to form 2-furansulfonic acid? (a) SO3 in pyridine at 100°C (b) Dilute H2SO4 at 200°C (c) SO2 at 100°C (d) Dilute H2SO4 at 100°C

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Which of the following reagents will react with pyrrole to form 2- formylpyrrole? (a) HCOOH (b) CHCl3/KOH (c) H2O2 (d) (CH3CO)2O/SnCl4

Description : Which of the following reagents will react with pyrrole to form 2- formylpyrrole? (a) HCOOH (b) CHCl3/KOH (c) H2O2 (d) (CH3CO)2O/SnCl4

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Which of the following reagents is used to prepare benzenediazoniumchloride from aniline?(a) NaNO2 + HCl(b) LiAlH4(c) NH2NH2 + KOH(d) NaOH

Description : Which of the following reagents is used to prepare benzenediazonium chloride from aniline? (a) NaNO2 + HCl (b) LiAlH4 (c) NH2NH2 + KOH (d) NaOH

Last Answer : NaNO2 + HCl

Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid

Description : Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid

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Which of the following reagents can be used to distinguish between chlorobenzene and benzyl chloride? (a) alcoholic AgNO3 (b) Br2 in CCl4 (c) KCN (d) Br2 in H2O

Description : Which of the following reagents can be used to distinguish between chlorobenzene and benzyl chloride? (a) alcoholic AgNO3 (b) Br2 in CCl4 (c) KCN (d) Br2 in H2O

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Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni(b) Br2 in CCl4(c) Zn/HCl(d) NH2NH2

Description : Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni (b) Br2 in CCl4 (c) Zn/HCl (d) NH2NH2

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Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH

Description : Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH

Last Answer : Benzene + Br2/FeBr3

Which of the following reagents is most suitable for preparing chlorobenzene from benzene? (a) Aqueous chlorine (b) Chlorine in the presence of ultraviolet light (c) Chlorine in acetic acid (d) Chlorine in the presence of FeCl3

Description : Which of the following reagents is most suitable for preparing chlorobenzene from benzene? (a) Aqueous chlorine (b) Chlorine in the presence of ultraviolet light (c) Chlorine in acetic acid (d) Chlorine in the presence of FeCl3

Last Answer : Chlorine in the presence of FeCl3

Which of the following reagents will react with methyl group rather than thebenzene ring in methylbenzene?(a) Chlorine in the presence of uv light(b) CH3Cl in the presence of AlCl3(c) CH3COCl in the presence of AlCl3(d) Hydrogen in the presence of nickel

Description : Which of the following reagents will react with methyl group rather than the benzene ring in methylbenzene? (a) Chlorine in the presence of uv light (b) CH3Cl in the presence of AlCl3 (c) CH3COCl in the presence of AlCl3 (d) Hydrogen in the presence of nickel

Last Answer : Chlorine in the presence of uv light

Which of the following reagents will react with acetamide to form methylamine? (a) LiAlH4 (b) Br2/NaOH (c) PCl5 (d) H2/Ni

Description : Which of the following reagents will react with acetamide to form methylamine? (a) LiAlH4 (b) Br2/NaOH (c) PCl5 (d) H2/Ni

Last Answer : Br2/NaOH

Which of the following reagents will convert acetic acid into acetyl chloride? (a) NaCl (b) HCl/ZnCl2 (c) SOCl2 (d) HCl

Description : Which of the following reagents will convert acetic acid into acetyl chloride? (a) NaCl (b) HCl/ZnCl2 (c) SOCl2 (d) HCl

Last Answer : SOCl2

Which of the following reagents can be used to reduce acetaldehyde to ethyl alcohol? (a) 1. LiAlH4 / 2. H3O+ (b) 1. NaBH4 / 2. H3O+ (c) H2/Pt (d) All of these

Description : Which of the following reagents can be used to reduce acetaldehyde to ethyl alcohol? (a) 1. LiAlH4 / 2. H3O+ (b) 1. NaBH4 / 2. H3O+ (c) H2/Pt (d) All of these

Last Answer : All of these

Which of the following reagents will react readily with both aldehydes and ketones? (a) Grignard reagent (b) Fehling's reagent (c) Tollens' reagent (d) Schiff's reagen

Description : Which of the following reagents will react readily with both aldehydes and ketones? (a) Grignard reagent (b) Fehling's reagent (c) Tollens' reagent (d) Schiff's reagen

Last Answer : Grignard reagent

Which of the following reagents readily react with ethyl methyl ether? (a) NaOH (b) Conc HI (c) KMnO4 (d) H2O

Description : Which of the following reagents readily react with ethyl methyl ether? (a) NaOH (b) Conc HI (c) KMnO4 (d) H2O

Last Answer : Conc HI

Which of the following reagents can be used to oxidize 1° alcohols to aldehydes? (a) KMnO4 (b) MnO2 (c) K2Cr2O7 (d) PCC

Description : Which of the following reagents can be used to oxidize 1° alcohols to aldehydes? (a) KMnO4 (b) MnO2 (c) K2Cr2O7 (d) PCC

Last Answer : PCC

Which of the following reagents will replace –OH group by a halogen atom? (a) HOCl (b) Br2 (c) SOCl2 (d) I2

Description : Which of the following reagents will replace –OH group by a halogen atom? (a) HOCl (b) Br2 (c) SOCl2 (d) I2

Last Answer : SOCl2

Lucas reagents is (a) HCl/NaNO2 (b) H2/Pd (c) HCl/ZnCl2 (d) H2/Pd/BaSO4

Description : Lucas reagents is (a) HCl/NaNO2 (b) H2/Pd (c) HCl/ZnCl2 (d) H2/Pd/BaSO4

Last Answer : HCl/ZnCl2

Ketones react with Grignard reagents to form an addition product which on hydrolysis gives a (a) Primary alcohol (b) Tertiary alcohol (c) Secondary alcohol (d) Ketal

Description : Ketones react with Grignard reagents to form an addition product which on hydrolysis gives a (a) Primary alcohol (b) Tertiary alcohol (c) Secondary alcohol (d) Ketal

Last Answer : Tertiary alcohol

Grignard reagents do not show any reaction with (a) Alkoxyalkanes (b) Alkanones (c) Alkyl alkanoates (d) Acyl halides

Description : Grignard reagents do not show any reaction with (a) Alkoxyalkanes (b) Alkanones (c) Alkyl alkanoates (d) Acyl halides

Last Answer : Alkoxyalkanes

Which of the following factors influence whether a reaction will proceed by an SN1, SN2, E1, or E2 mechanism? (a) Structure of the alkyl halide (b) Solvent (c) Concentration of reagents (d) Nature of the nucleophile (e) All of these

Description : Which of the following factors influence whether a reaction will proceed by an SN1, SN2, E1, or E2 mechanism? (a) Structure of the alkyl halide (b) Solvent (c) Concentration of reagents (d) Nature of the nucleophile (e) All of these

Last Answer : All of these

Which of the following reagents cannot be used to prepare an alkyl chloride from an alcohol? (a) HCl + ZnCl2 (b) SOCl2 (c) NaCl (d) PCl5

Description : Which of the following reagents cannot be used to prepare an alkyl chloride from an alcohol? (a) HCl + ZnCl2 (b) SOCl2 (c) NaCl (d) PCl5

Last Answer : NaCl

Which of the following reagents will react with propene? (a) Hot alkaline KMnO4 (b) Sodium metal (c) Cold dilute HNO3 (d) LiAlH4

Description : Which of the following reagents will react with propene? (a) Hot alkaline KMnO4 (b) Sodium metal (c) Cold dilute HNO3 (d) LiAlH4

Last Answer : Hot alkaline KMnO4

Ammonia leakage in the refrigeration system is detected by (A) Sulphur stick, which on detection gives white smoke (B) Using chemical reagents (C) Its smell (D) Soap solution

Description : Ammonia leakage in the refrigeration system is detected by (A) Sulphur stick, which on detection gives white smoke (B) Using chemical reagents (C) Its smell (D) Soap solution

Last Answer : Option A

Reagents vs. Modern Biotechnology:

Description : Reagents vs. Modern Biotechnology: 

Last Answer : Reagents vs. Modern Biotechnology: Application of the reagent has aided not only the correct sequencing of peptide segments of many proteins but also the production, through genetic engineering, of ... , automated synthesis of polypeptide and polynucleotide chains and the sequencing of DNA and RNA.

Protein Chemistry (sequencing) vs. Application of Reagents:

Description : Protein Chemistry (sequencing) vs. Application of Reagents:

Last Answer : Protein Chemistry (sequencing) vs. Application of Reagents: A simple chemical applied according to a well recognized concept can be responsible for a great advance in biological chemistry. Thus, ... participation into selective, limited, non-enzymatic cleavage at methionine in a peptide chain. 

[Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic. Explain. (At. no. Fe = 26) -Chemistry

Description : [Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic. Explain. (At. no. Fe = 26) -Chemistry

Last Answer : In both the cases, Fe is in oxidation state +3. Outer electronic configuration of Fe+3 is : In the presence of CN-, the 3d electrons pair up leaving only one unpaired electron. The ... sp3d2 forming an outer orbital complex. As it contains five unpaired electrons so it is strongly paramagnetic. .