What are X,Y and Z in the following reactions ?
`(H_(3)C)_(3)C - overset(ɵ)(O) overset(o+)(N)a+CH_(3)CH_(2)Br rarr X + NaBr`
`(H_(3)C)_(3)C - Br + CH_(3)CH_(2)overset(ɵ)(O)overset(o+)(N)a rarr Y + Z`

Answer

c

Explanation

`(CH_(3))_(3)C-overset(-)(O)Na^(+) + CH_(3)CH_(2)Br rarr (CH_(3))_(3)underset((X))(CO)CH_(2)CH_(3) + NaBr`
`(CH_(3))_(3)C-Br + CH_(3)CH_(2)overset(-)(O)Na^(+) rarr CH_(3)-underset((Y))underset(CH_(3))underset(|)(C) = CH_(2)+CH_(3)underset((Z))(CH_(2))OH`
These reactions are known as Williamson synthesis where the product (ether or alkene) depends upon the type of halide and alkoxide ion. The reaction (I) involves `SN_(2)` attack of `3^(@)` alkoxide ion on `1^(@)` halide giving ether whereas in reaction. (II), a tertiary alkyl halide and primary alkoxide ion are present which gives alkene and alcohol.