I tried some commands like
iw list and
iwconfig but couldn't see the supported wifi version (b/g/n/ac).
The simplest way is to find out your card type and search online its capabilities. The command to find your hardware is
lshw -c network. In my case, this gives:
*-network description: Wireless interface product: QCA9565 / AR9565 Wireless Network Adapter vendor: Qualcomm Atheros physical id: 0 bus info: pci@0000:02:00.0 logical name: wlan7 version: 01 serial: d0:53:49:3d:53:fd width: 64 bits clock: 33MHz capabilities: bus_master cap_list rom ethernet physical wireless configuration: broadcast=yes driver=ath9k driverversion=4.4.0-31-generic firmware=N/A ip=192.168.0.78 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn resources: irq:17 memory:d0700000-d077ffff memory:d0780000-d078ffff WARNING: output may be incomplete or inaccurate, you should run this program as super-user.
Note, that in your case as shown in comments for your card it's just a lucky coincidence that the card product description shows
product: BCM4352 802.11ac Wireless Network Adapter In my example description shows model only.