How ConnectionPool works in RAC?

For example, we create a ConnectionPool .if one of the instances in RAC is down, and some connections in ConnectionPool just connect this instance, then this connection become invalid. Can ConnectionPool automatically eliminate this connection from the pool?
If happened, How can I deal with it?

For example, we create a ConnectionPool .if one of the instances in RAC is down, and some connections in ConnectionPool just connect this instance, then this connection become invalid. Can ConnectionPool automatically eliminate this connection from the pool?
If happened, How can I deal with it?

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