1.

CH_(3)I overset(DMSO)rarr[X]. The major product [X] is

Answer»

`"["Me _(3)overset(+)S=O"]"I^(-)`
`"["Me _(2)overset(+)S-OMe"]"I^(-)`
both (a) and (b)
none of these.

Solution :`DMSO "(" Me_(2)overset(..)(S)=overset(..)(O)")"` is an ambident NUCLEOPHILE. i.e., the NUCLEOPHILES which have more than one ( generally two ) suitable atoms through which they can attack the substrate are known as ambident nucleophiles.
`:.` Methylation of DMSO with Mel gives two isomers (A) and (B) from S-methylation and from O-methylation, respectively.
Since .S. is better nucleophilic site ( because .O. is more electronegative than .s. ), (A) is the major product


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