1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ASHA 777 [7]
3 years ago
13

How many different sets of equivalent protons are there for para-xylene (1,4-dimethylbenzene)? only 1 two three four?

Chemistry
1 answer:
ELEN [110]3 years ago
7 0

Answer:

Two  

Step-by-step explanation:

There are two ways to determine the number sets of equivalent protons in a compound.  

(a) By substitution

Replace each H with a different group and see if you get a different compound

For example, the six CH₃ H atoms are an equivalent set, because, if I replace any one of them, I will always get the same compound: 1-chloromethyl-4-methylbenzene (Fig. 1).

Similarly, the four aromatic H atoms are an equivalent set. If I replace any one of them, I will always get the same compound: 2-chloro-1,4-dimethylbenzene (Fig. 2).

Thus, there are two sets of equivalent protons in p-xylene.

(b) By symmetry

Two atoms are equivalent if one can be converted into the other by a <em>symmetry operation</em> on the molecule.

The methyl hydrogens can be interconverted by a combination of <em>reflections</em> about the AB and CD mirror planes and by<em> </em><em>rotation</em>s about the C-C bonds to the ring (Fig. 3).

Similarly, the four aromatic H atoms can be interconverted by a combination of <em>reflections</em> about the AB and CD mirror planes.

Again, we find two sets of equivalent protons.

You might be interested in
3. Complete the following conversions.
Tasya [4]
A. 0.0105 kg
b. 1570 m
c. 3.5x10^-6
d. 3500000
e. 1000 mL
f. 0.000358 m3
g. 548.6 cm3
3 0
3 years ago
GUYS I REALLY NEED THIS ASAP!!!!!​
Nastasia [14]

Answer:

I don't think so

Explanation:

The equation doesn't look balanced

8 0
3 years ago
90.00 ml of 0.25 M calcium hydroxide are required to titrate 100.00 ml of hydrochloric acid. What is the molarity of the HCI?
bezimeni [28]

Answer:

50000mm u add subtract multiply divide

Explanation:

4 0
3 years ago
Which of the following is part of the central nervous system?
OLga [1]

The brain is part of the central nervous system.

Nerves and sensors are part of the peripheral nervous system. Only the brain and spinal cord make the central nervous system.

3 0
2 years ago
Read 2 more answers
Question 3 of 10
oksian1 [2.3K]
It’s sulfur because it shows little reactivity.
6 0
3 years ago
Other questions:
  • How many atoms of each element are present in 3.2 moles of k2so3
    11·2 answers
  • help me please. In a certain organic compound, one of the carbon atoms is bonded to two atoms: a hydrogen atom and a carbon atom
    13·1 answer
  • Consider the following reaction at 298K.
    7·1 answer
  • Which particles can be stopped by human skin? ) alpha and beta particles only alpha particles alpha and gamma particles beta and
    15·2 answers
  • Na2CO3 + 2HCl ---------&gt; 2NaCl + CO2 + H2O How many moles of NaCl are produced from the reaction of 1.67 x 1022 molecules of
    11·1 answer
  • Workers on a movie set are stacking fake glass to use in a scene. The diagram above shows the pieces of fake glass before they t
    12·1 answer
  • If you have 3.5 L of He to blow up balloons... at STP...
    5·1 answer
  • Which one of the following produces hydrogen ions in a water solution?
    7·1 answer
  • Determine the number of grams of carbon 3.14x 1023 atoms of carbon
    8·2 answers
  • Calculate the wavelength and frequency of an emitted photon of gamma radiation that has energy of 3.02 × 1011 J/mol.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!