What are the packets sent in a TCP connection?

Syn // Syn - Ack // Ack

It's either you are so confused with the question or that question actually is very vague. It is not very clear. It seems that's obviously not the actual question you heard. The interviewer is probably asking "What are the information is in a TCP packet?" - This question makes lot of sense.

Whoever answered it with a 3 way handshake (SYN/SYN-ACK/ACK) does not know what the question is about.

Packets in TCP are called segments. Endpoints of TCP connections are identified by host IP and port number. Ports 0 through 1023 are privleged. Only root can open them

TCP divides a stream of data into chunks, and then adds a TCP header to each chunk to create a TCP segment. A TCP segment consists of a header and a data section. The TCP header contains 10 mandatory fields, and an optional extension field. The payload data follows the header and contains the data for the application.