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Which of the following compound is expected to show a sharp singlet for one of its protons at δ ≥ 8 ppm in 1H NMR spectrum, given that this signal remains unaffected on shaking the solution thoroughly with D2O?
Sometimes, the color observed in Lassaigne’s test for nitrogen is green. It is because of:
Arrange the following molecules, in their chemical shift value(s) of ortho hydrogen in 1H NMR:
Consider the following:
Order of C-H stretching frequency in IR-spectroscopy would be:
The complementary strand of DNA for the following single stranded DNA sequence: is:
The correct sequence of the amino acids present in the tripeptide given below is:
Consider the following:
Order of stretching frequency in IR-spectroscopy would be:
For the detection of sulfur in an organic compound, Lassaigne’s extract is acidified with acetic acid. Lead acetate solution is then added to it. The black precipitate formed is due to the formation of ?
Which of the following compound show only two signals in 1H NMR and a strong IR bond at
A compound with molecular formula C5H10O does not form, 2, 4-DNP derivative. It responds positively to Iodoform test and on ozonolysis gives one mole formaldehyde. It could be:
The correct match of the 1H NMR chemical shift d of the following species/compound is:
In the Lassaigne’s test for the detection of nitrogen in an organic compound, the Prussian blue colour is due to the formation of _______________:
The correct order of 1H NMR chemical shift (δ) values for the labeled methyl groups in the following compound is:
The Beckmann rearrangement of a bromo-acetophenone oxime (C8H8BrNO) gives a major product having the following 1H NMR – 9.85 (S, 1H), 7.88 (S, 1H), 7.45 (d, 1H, J=7.2), 7.17 (m, 1H, 7.12 (d, 1H, J=7.0 Hz), 2.06 (S, 3H). The structure of the product is:
The absorption at lmax 279 nm (ε = 15) in the UV spectrum of acetone is due to:
The structure of D-(+)-glucose is:
The structure of L-(–)-glucose is:
Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?
Consider the following:
Order of their stretching frequency in IR-spectroscopy would be:
In the UV-visible absorption spectrum of an α, β-unsaturated carbonyl compound, with increasing solvent polarity:
Among the following, the compound that displays an IR band at 2150 cm–1 is:
The compound which shows IR frequencies at both 3314 and 2126 cm–1 is:
Compound I gives a strong infrared absorption at 1730 cm–1. 1H NMR spectrum indicates that it has two types of hydrogen atoms; one H atom appearing as singlet at δ = 9.7 ppm and 9H atoms appearing as a singlet at δ = 1.2 ppm. The structure of I is:
Consider the following:
Order of C-O stretching frequency in IR-spectroscopy would be:
During the detection of sulfur in an organic compound, the violet color formed by the addition of Sodium nitroprusside to Lassaigne’s extract is due to _____________:
Lassaigne’s test for the detection of nitrogen do/does not fail in:
Which of the following compound exist(s) in Zwitter ion form:
Amino acids and Sulfamic acids exist as Zwitter Ions. Option C is neither an amino acid nor sulfamic acid so, does not exist as Zwitter ion where as the rest of them do.
An organic compound having the molecular formula C10H14 exhibited three singlets in the 1H NMR spectrum. The compound(s) may be:
Which of the following molecule/s will absorb infrared radiation?
Which of the following statement(s) is correct about the Amino acids:
Identify the correct pair of statements.
(i) Alternate name of thymine is 5-methyl uracil
(ii) Arachidonic acid molecule contains less number of carbons than palmitic acid
(iii) Cellulose contains complex halices
(iv) Aquaporin is a polypeptide
i) Thymine is a nitrogenous base which pairs with adenine by the formation of two hydrogen bond. The molecular structure includes a ring of carbon and nitrogen with nitrogen at first and third position. A methyl group is attached to fifth carbon and an oxygen atom is attached to the second carbon. It is also known as 5-methyl uracil.
iv) Aquaporin is a water transport channel present in the cell membrane which is present in the cell. It helps in the selective transport of the water molecules.
Whereas, cellulose is the polysaccharide of unbranched chain and arachidonic acid (C20H32O2) has more number of the carbon atom as compared to palmitic acid (C12H22O2).
So, the correct answer is option D.
Out of following which is not an excitation source in IR-spectroscopy is:
The maximum no of dipeptides that could be obtained by reaction of phenylalanine with leucine is____?
Calculate the isoelectric point (pI) of lysine. Given the pKa of α-NH3 is 8.95, pKa of side chain NH3 is 10.53 and pKa of α-COOH is 2.18………………: (up to 2 decimal place)
Thymine is a DNA base and has a –CH3 group at Xth position. ‘X’ is:
The value of (X + Y) would be if X = Total number of Monoterpenes and Y = Total number of Diterpenes
In the Iodoform reaction of RCOCH3, ‘X’ mole of I2 and ‘Y’ mole of NaOH are used. Find the value of ‘X + Y’:
Number of correct statements are:
I. Tertiary amines are insoluble in HBr
II. Secondary amines are insoluble in NaOH
III. Primary amines on treatment with NaNO2/HCl produce N2 gas
IV. Generally, amino acids on treatment with Ninhydrin produce blue-voilet color
V. Fehling’s solution gives positive test for both aliphatic and aromatic aldehydes
VI. Acetic acid on treatment with FeCl3 produces blood red coloration
VII. Formic acid gives positive Tollen’s test
How many of the following pairs give same osazone?
Glucose-Fructose, Galactose-Talose, Altrose-Allose, Ribose-Arabinose, Idose-Gulose
Given the fact that 1, 3-butadiene has a UV absorption of 217 nm, the absorption wavelength (in nm) for the conjugated system shown below is……………,
(Use these absorption values for auxochromes groups:Alkyl: + 5; exo-cyclic double bond: + 5 every additional conjugated C = C : + 30)
If 500 glucose molecules are used to make starch, how many molecules of water would be produced in the condensation reactions? [Think of starch as a linear chain of glucose molecules]:
How many essential amino acids are there among following?
Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine
How many of the following statements regarding structure of proteins is/are true?
I. Primary structure helps in sequencing of amino acids and location of disulfide bonds.
II. Secondary structure sets up Protein back-bone
III. Denaturation of proteins is reversible
IV. Tertiary structure is found in globular proteins and can be revealed by X-ray crystallography
V. Keratin form derivatives of skin like hairs, feathers, claws, horns etc.
VI. Actin and Myosin are called Muscle proteins
VII. Thrombin helps in blood coagulation
How many of the following compounds form zwittor ions?
Glycine, Sulphanilic acid, Anthranilic acid, Lysine, Tryptophan, Leucine.
The total number of compound for which δA>δB in 1H NMR spectroscopy:
The total number of carbonyl compounds which have higher IR stretching frequency than acetone:
If two signal differ by 1.5 ppm in 300 MHz spectrophotometer, how do they differ (in ppm) in 100 MHz?
How many different dipeptides could be made with 20 types of amino acids?