Operating System (OS)
The instruction register

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
None of these
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
to build a uniform symbol table
to parse the source program into the basic elements or tokens of the language.
None of these
to build a literal table and an identifier table

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