Which of the following π bonds is IR inactive? 
Definitions:
Neurotransmitter
Chemical messengers that transmit signals across synapses from one neuron to another in the brain and nervous system.
Gap Junction
Specialized intercellular connections between a multitude of animal cell-types that directly connect the cytoplasm of two cells, allowing various molecules, ions and electrical impulses to directly pass through a regulated gate between cells.
Synaptic Transmission
The process through which neurotransmitters are released by one neuron and taken up by another, facilitating communication between neurons.
Electrical Synaptic Transmission
A form of neural communication that occurs through electrically conductive gap junctions directly connecting the cytoplasm of adjacent neurons.
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