PROBLEM What of the following statements is true regarding the limited use of the Friedel-Crafts reaction? A. This product has higher reactivity than the base material, resulting in uncontrolled polyalkylation. B. There are also side reactions that can result from carbocation rearrangements. The C. The Friedel-Crafts reaction is only possible in the presence of meta-directing electrons withdrawing substituents that are attached to the benzene rings. D. The Reactivity of the haloalkane rises directly in line with the polarity of the CX bond in the order C-F >C-Cl > C-Br > CI E. Haloalkenes as well as haloalkanes can’t undergo reactions with benzene rings since the resulting vinyl cations as well as aryl cations are inaccessible to energetically.
Problem Details
Which one of the above assertions is true regarding the limited utility of synthetics in the Friedel-Crafts-alkylation reaction?
A. It is more reactive to the initial material, resulting in uncontrolled polyalkylation.
B. some side effects could result from rearrangements in carbocation.
C. The Friedel-Crafts Alkylation reaction is only possible in the presence of meta-directing electron-withdrawing substitutes attached to the benzene rings.
D. The Reactivity of the haloalkane grows proportionally to the polarity of the C-X bond within the order C-F >C-Cl > C-Br > C. I
E. Haloalkenes and Haloalrenes cannot undergo reactions with benzene rings as the resulting vinyl cations, and the aryl cations are not accessible to energy.
Which Of The Following Statements About Receptor Potentials Is False?
The receptor potential, also called generator potential, a form of graded potential, is the transmembrane-potential change that occurs when you activate a sensory receptor.
The process of sensor transduction usually generates the receptor potential. It’s usually an event of depolarization that results from the flow of current inward. The current flow is often a catalyst to bring the potential of the membrane for the sensor to the threshold that triggers the action potential. The receptor potential may initiate an action potential in the neuron or adjacent cells. Inside the same nerve, the possibility of a receptor can create a local currency that flows into a region capable of creating an action potential through opening the voltage-gated ion channels.
The potential for a receptor can trigger the release of neurotransmitters from one cell to be absorbed by another cell, which will trigger an action potential within that second cell. The size of the possibility of the receptor determines the frequency at that action potentials are created and is controlled through adaptation to stimulus strength and the temporal summation of subsequent receptor potentials. Receptor potential depends on receptor sensitivities that can change slow, leading to the slow decay of the receptor potential, or it can be rapidly fading and resulting in a rapidly generated but less lasting receptor potential that is shorter-lasting.
