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Svetach [21]
3 years ago
10

In which region of the carbon-13 NMR spectrum would you expect to find a resonance for the carbonyl group of an aliphatic ketone

? The given chemical shift ranges are approximate.
A. 50-80 ppm
B. 180-210 ppm
C. 100-150 ppm
D. 65-85 ppm
E. 9-10 ppm
F. 110-170 ppm
Chemistry
1 answer:
Mkey [24]3 years ago
6 0

Answer:

Option B 180-210 ppm

Explanation:

C-13 NMR tells about the carbon skeleton and it is similar to proton NMR. Reference compound in C-13 NMR is tetramethylsilane (TMS) in which chemical shift of carbon is considered to be 0.0 ppm.

Chemical shift of carbon having different hybridization is different.

For example, chemical shift of sp3 hybridized carbon is in the region of 0 to 90 ppm.

Chemical shift of sp2 hybridized carbon is in the region of  110 to 220 ppm.

In aliphatic ketone, the carbolyl carbon atom is sp2 hybridized. So, C-13 chemical chemical shift range for carboly carbon is 110-220 ppm

Therefore, among the given option, option B is correct.

You might be interested in
Why do oxygen and sulfur have similar chemical properties?
Step2247 [10]

Answer:

Oxygen and sulfur have similar chemical properties because both elements have six electrons in their outermost electron shells. Indeed, both oxygen and sulfur form molecules with two hydrogen atoms: water and hydrogen sulfide

Explanation:

3 0
3 years ago
How much water (H2O ) would form if 4.04 g of hydrogen (H2) reacted with 31.98 g of oxygen (O2 )?
Norma-Jean [14]

Answer:

Mass = 36 g

Explanation:

Given data:

Mass of water formed = ?

Mass of hydrogen = 4.04 g

Mass of oxygen = 31.98 g

Solution:

Chemical equation:

2H₂ + O₂   →   2H₂O

Number of moles of hydrogen:

Number of moles = mass/molar mass

Number of moles = 4.04 g/ 2 g/mol

Number of moles = 2.02 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 31.98 g/ 32 g/mol

Number of moles = 1.0 mol

Now we will compare the moles of water with hydrogen and oxygen.

                O₂         :         H₂O

                 1           :           2

                H₂         :         H₂O

                 2          :          2

               2.02       :      2.02

Number of moles of water formed by oxygen are less thus oxygen will limiting reactant.

Mass of water:

Mass = number of moles × molar mass

Mass = 2 mol × 18 g/mol

Mass = 36 g

8 0
2 years ago
How many electrons will a metal generally have in its outer energy level?
Zarrin [17]

Answer:

Metals have one or two electrons in their outermost shell

C. 1-2

Explanation:

  • Metals have low ionisation energy because they easily looses the outermost electrons
  • They have only one- two electrons in the outer most shell.
  • They loose these electron to form charged species called cation.

4 0
3 years ago
I need help with my homework.Calculate the number of formula units in: 41.5 grams CaBr2
lana66690 [7]

Answer:

\text{ }1.25\times10^{23}\text{ formula units}

Explanation:

Here, we want to calculate the number of formula units in the given molecule

We start by getting the number of moles

To get the number of moles, we have to divide the mass given by the molar mass

The molar mass is the mass per mole

The molar mass of calcium bromide is 200 g/mol

Thus, we have the number of moles as follows:

\frac{41.5}{200}\text{ = 0.2075 mol}

The number of formula units in a mole is:

1\text{ mole = 6.02 }\times10^{22}\text{ formula units}

The number of formula units in 0.2075 mole will be:

0.2075\text{ }\times6.02\times10^{23}\text{ = }1.25\times10^{23}\text{ formula units}

5 0
1 year ago
What is the empirical formula for glucose<br> A)<br> B)<br> C)<br> D)
pshichka [43]
The Answer is A CH2O

The molecular formula for glucose is C6H12O6. The subscripts represent a multiple of an empirical formula. To determine the empirical formula, divide the subscripts by the GCF of 6 which gives CH2O.
4 0
3 years ago
Read 2 more answers
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