Identify the following compound: C10H10O2: NMR: δ 2.82 (6 H, s), δ 8.13 (4 H, s)...

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Question

Identify the following compound: C10H10O2: NMR: δ 2.82 (6 H, s), δ 8.13 (4 H, s)...

Identify the following compound:

C₁₀H₁₀O₂:
NMR: δ 2.82 (6 H, s), δ 8.13 (4 H, s)

IR: 1681 cm^-1, no O-H stretch

science chemistry

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Answer 1

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Concepts and reason

¹H NMR Spectroscopy:

• Nuclear magnetic resonance (NMR) spectroscopy is one of the techniques in analytical chemistry that is widely used to determine the purity of sample, and also to predict the structure of the organic compounds.

• The NMR spectroscopy is a phenomenon that is observed, when the frequency of nuclei of atoms (sample) resonates with frequency of the rotating magnetic field.

• The ΗΝMR spectroscopy determines different types of hydrogens (chemically non-equivalent hydrogens) that are present in a molecule.

Infrared Spectroscopy (IR):

• Infrared spectroscopy is an important analytical tool to determine the functional groups in the chemical compounds.

• It is also called as the vibrational spectroscopy.

• Any compound having covalent bonds absorbs a range of frequencies of the electromagnetic radiation in the infrared region of the electromagnetic spectrum.

• The IR radiations lie in the wavelength range of 400 - 800 nm.

Fundamentals

¹H NMR Spin-Spin Coupling Patterns:

neighboringNumber
(chemically
Number
of
of
Splitting
Peak
hydrogens
equivalent)
non-
peaks
(n 1)
heights
ratio
Name
n
Singlet

The degree of Unsaturation or index of hydrogen deficiency:

DoU = 2C +N- H-X+2
2
where
Degree of unsaturation is DoU
The number of carbons is C.
The number of nitrogen is N
The number o

The molecular formula represents the total number of atoms that are present in the compound. In Chemistry,

IHD refers to the index of hydrogen deficiency which is also called as the degree of unsaturation. IHD (index of hydrogen deficiency) is a formula, which is used to determine the chemical structure from the molecular formula.

A cyclic structure, which is a double and triple bond in structure, can be determined with the help of the degree of unsaturation values.

For example:

IHD = 0, no unsaturation in the molecule. The structure is saturated hydrocarbon. All bonds are single bonds in the compound.

IHD = 1, the structure may contain 1 double bond or 1 ring.

IHD = 2, the structure may contain 2 double bonds or 1 ring with 1 double bond.

IHD = 3, the structure may contain 3 double bonds or 1 ring with 2 double bonds.

IHD = 4, the structure may contain 4 double bonds or 2 triple bonds, or 1 ring with three double bonds or 2 rings with 2 double bonds or 3 rings with 1 double bond.

The mathematical equation for the IR wavenumber:

$k v = 2пс \и$

Where,

Wavenumber of absorption = .

Velocity of light = .

Force constant = .

Reduced mass = .

IR frequency and range of absorption:

absorption
of
Range
Functional group
(cm)
Alkane (C-H
2800-2900
Alcohol (O-H)
Alkene (C C)
3400-3600
1640-1680
3020-3100
(C-

The structure of the compound is:

Ans:

The structure for the given chemical formulae is:

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Answer 2

Identify the following compound: C10H10O2: NMR: δ 2.82 (6 H, s), δ 8.13 (4 H, s)...

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