The reaction,
`RX-R'-ONatoR'-O-R+NaX` is called

The reaction, RX + R-ONa to R-O-R + NaX is called

The reaction R-X+NaItoR-I+NaX is called as

The reaction, RX + OH^(-) to R-OH + X^(-) , is

For the reaction R- Br to R- O - N =O the suitable reagent is

For the reaction R- Br to R- O - N =O the suitable reagent is

Reaction OF R-OH || R-X || R-O-R

In the Williamson synthesis of ethers given by the general equation. R-X+ R'ONa to R-O-R' the order of reaction of RX is __________.