Can a 802.11g client be connected to 802.11a Access Point?
No. 802.11g uses the 2.4 GHz band. 802.11a uses the 5 GHz band. Consider a radio station broadcasting on 102 FM and a car radio tuned to 1060 AM. There is no common medium for communication, so no possibility for reception whatsoever.
You can purchase a dual-band AP that is able to connect to 802.11a and 802.11g stations. This is kind of like to having a car radio that can be tuned to either AM or FM, letting it receive transmissions on either band.
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