What information about polymers is obtained by using a magnet during NMR spectroscopy

Q: The chromatographic purification of 1 g of (-)-ethyl lactate with an ee of 85% yields the optically…

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Q: CH3 oH Mcthod analysis for this compound by using UV ?

A: The solution of the question is given below:

Q: Explain the differences observed in the T, and Tm values for each pair of polymers: (a) polyester A…

A: Given that, a)

Q: What proportion of benzoic acid should be used with an equimolar mixture of adipic acid and…

A:

Q: Why anilinium ion absorbs at 254 nm in the UV and aniline  absorbs at 281nm?

A: In UV visible spectrum of a aniline or anilinium cation peak appears due to π to π* of double bond…

Q: Select which type of GC column is best suited to analyze a mixture containing o-xylene, m-xylene,…

A: The method of separating a compound which can be vaporized without the decomposition process and…

Q: Why does methyl methacrylate not undergo cationic polymerization?

A: In cationic polymerization the initiator is an electrophile that adds to the alkene monomer causing…

Q: 21) Benzoyl peroxide is a common radical initiator for polymerization reactions, such as the…

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Q: How you would analyse acylcarnitines with electrospray mass spectrometry?

A: Acylcarnitines are the fatty acids for the ester group of L-carnitine. It can cause various…

Q: Interpret the infrared spectra for carvone and limonene and the proton and carbon-13 NMR spectra of…

A: The structure of limonene is represented as follows:  Limonene will have C-H stretching at 3000…

Q: Two samples of polystyrene, samples A and B, were synthesised. A from the addition of n- butyl…

A: Introduction: Polymers: Polymers are the large molecules made up of repeating units. The physical…

Q: bead resin with functional group R-CH2-SO3- will have highest relative capacity at pH ___.     8…

A:

Q: lumefantrine synthesis

A: Lumefantrine  is an antimalarial agent which helps to treat acute malaria.

Q: Explain UV spectrum of isoprene ?

A: Like any other absorption spectrum, the UV–vis spectrum of a substance is the graph drawn between…

Q: Select which type of GC column is best suited to analyze a mixture containing o-xylene, m-xylene,…

A: The isomers of xylene i.e., o-xylene, m-xylene and p-xylene are difficult to seperate from each…

Q: -gold-Prelog sequence rules.

A: CIP rule is used for ranking in the group and then give the perioriy. For Highest perioriy we can…

Q: What is the formaldehyde emission rate of fiberwood?

A: Answer -  formaldehyde emission  - A colourless and strong-smelling gas, formaldehyde is naturally…

Q: Which layer (aqueous or organic) will phenylalanine partition into during extraction? water  or…

A: Solubility depends on the polarity of the compound and solvents .

Q: Select a suitable solvent for analysis of one of these terpenes by UV spectroscopy. Explain your…

A: The solvents for analysis of one the terpenes by UV spectroscopy  does not absorb above the 210 nm…

Q: What should you do if there is some question about which layer is the organic one during an…

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Q: Which of the ff. turbidity measurements is the least accurate? Secchi Disk Method Jackson Candle…

A: Answer  All given methods are used for measurement of turbidity

Q: он он

A: The answer is given as follows

Q: What spectral features including mass spectra, IR spectra, proton spectra and carbon spectra allow…

A: Benzoic acid is a carboxylic acid because of the presence of a carboxyl group. Benzonitrile is a…

Q: What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of…

A: Benzoyl peroxide acts as initiator in polymerization of alkenes by giving chain reactions. The…

Q: Liquid-liquid extraction is particularly effective for separating organic compounds that have…

A: The process in which a solvent A is pulled from another solvent B which are partially miscible or…

Q: What are the fundamental differences between a good solvent and a theta solvent, and how do they…

A: Good solvent And theta Solvent  differs in interaction   in polymer  chains

Q: How would you distinguish between methyl benzoate and phenylacetic acid using 1H NMR spectroscopy?

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Q: What may have caused the separation of the dye components?

A: ✓The dyes are carried at different rates because they are not equally soluble. A dye  that is the…

Q: ADDED REAGENT(S) OBSERVATIONS Ba(NO3)2 NVR HNO3, Fe(NO3)3 Blood red aqueous layer; pink toluene…

A: Anions can be detected by various reagents such as ferric nitrate, potassium permanganate and barium…

Q: How can I calculate polycarboxylate(liquid) density?

A: To explain: The procedure for calculating the density of polycarboxylate liquid.

Q: UV, IR, and MS (Interpretation of Structure) 1.) Predict the structure of the two unknown…

A: 1. Odd mass, odd no of nitrogens present. Therefore one nitrogen present. Therefore the compound…

Q: Why are alcohols usually bad electrophiles? You must support your answer with data on the…

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Q: Is it possible to extract benzoic acid using ethanol, instead of DCM, during solvent extraction?…

A: Solvent extraction is a technique in which the compounds are based on solubilities. In this…

Q: Explain the differences observed in the Tg and Tm values for each pair of polymers: (a) polyester A…

A: (a) The glass transition temperatureTg of Polyester A is less than 0°C and for PET it is 70°C. It…

Q: What is the IUPAC of the image attached?

A: Hydrocarbons are defined as the group of organic compounds that contain only carbon and hydrogen…

Q: Explain Retrosynthetic Analysis ?

A: Organic chemistry is about synthesis of the compounds. From simpler organic compounds to complex…

Q: the

A: Dear student I have given answer to your question in the image format

Q: For the electrophilic aromatic iodination of vanillin 0.00348 moles of vanillin were used along with…

A: The main reaction takes place between vanillin and KI while ozone is used to accelerate the reaction…

Q: When would you use recrystallization technique as opposed to extraction? What is the relative…

A: Recrystallization is often used as a final step after other separation methods such as extraction,…

Q: how the polyesters is synthesied using reactive distillation

A: Solution:        Reactive distillation is an efficient and economic method for the completion of…

Q: The following IR is a (n-Butylamine). Please complete the chart corresponding to the IR

A: n-Butylamine is an amine with the condensed formula CH3CH2CH2CH2NH2.

Q: Why 9(t-butyl) anthracence has a lower quantum yield than 9-methyl anthracence?

A: The quantum yield (Φ) is a measure of the efficiency of photon emission as defined by the ratio of…

Q: what is the wavelength of the HOMO- LUMO transition in this polyene dyes?

A: Fieser Kuhn rule for conjugated polyenes:  λmax = 114 + 5M +n (48 -1.7n)-16.5 Rendo-10 Rexo M is…

Q: Determine the starting material needed to prepare pseudoepherine using reductive amination

A: In this question, we will Identify starting material.  You can see details explanation and Solution…

Q: Among the three solvents used in the separation of spinach pigments which produced the most…

A: There are different types of pigments present in the green plants like spinach. Each pigment shows a…

Q: Explain the Mechanism - Forming Branched Polyethylene During RadicalPolymerization ?

A: A polymerization in which the polymers are formed by the successive addition of building blocks.…

Q: As a method for the synthesis of cinnamaldehyde (3-phenyl-2-propenal), a chemist treated…

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Q: Why does the nylon form at the interface of sebacoyl chloride and hexamethylene diamine?

A: We have to discuss the reason as to why nylon is formed at the interface of sebacoyl chloride and…

UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.