Why in Arduino UNO pin 5 of the Reset button (it is pin of metal case) not connected to GND?
reset button is connected to the RESET pin of Atmel 328p
Why do you think it should be ?
If that pin goes LOW the chip RESETs.
What metal case? You mean the button casing? I guess it's a designer's whim to leave it unconnected...
Yes, button casing, middle pin.
So that the user could decide whether they want it grounded or not? 
IDK, myself I have more serious criticisms, like headers that don't line up on 0.1" centres, so you can't just slap a perfboard on top...
From that picture, it appears that the button they used doesn't have the 5th terminal.
So that the user could decide whether they want it grounded or not?
But in the Arduino WiFi, pin 5 of Reset button is connected to GND (see below)
Go figure.
if you connect reset to gnd manually using the pin or the connection of the button, arduno cant gonna reset
if you connect reset to gnd manually using the pin or the connection of the button, arduno cant gonna reset
This is the pcb of the Arduino UNO board (see below). Pins 1, 2, 3, 4, 5 refer to the Reset button. Try shorting pin 5 and pin 1. The reset function will work, do an experiment.
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