To solve this problem, we need to analyze each statement regarding synapses and identify the incorrect one. Let's examine each option:$\newline \bullet$Option 1: The membranes of presynaptic and postsynaptic neurons are in close proximity in an electrical synapse.$\newline$ - In electrical synapses, the presynaptic and postsynaptic membranes are indeed in close proximity, allowing ions to pass directly between cells.$\newline$ - This statement is correct.$\newline \bullet$Option 2: Electrical current can flow directly from one neuron into the other across the electrical synapse.$\newline$ - Electrical synapses allow direct flow of electrical current between neurons through gap junctions.$\newline$ - This statement is correct.$\newline \bullet$Option 3: Chemical synapses use neurotransmitters.$\newline$ - Chemical synapses rely on neurotransmitters to transmit signals across the synaptic cleft.$\newline$ - This statement is correct.$\newline \bullet$Option 4: Impulse transmission across a chemical synapse is always faster than that across an electrical synapse.$\newline$ - In reality, electrical synapses are faster because they allow direct ion flow, whereas chemical synapses involve neurotransmitter release and binding, which takes more time.$\newline$ - This statement is incorrect.$\newline$Therefore, the incorrect statement is Option 4.