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What combination of Grignand reagent and...

What combination of Grignand reagent and alkyl nitirle is useful to prepare butanone

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(a) `CH_(3)CN underset((ii) H_(2)O)overset((i) C_(2)H_(5)MgBr)rarr CH_(3)COCH_(2)CH_(3)`
(b) `CH_(3)CH_(2)CN underset((ii)H_(2)O)overset((i) C_(2)H_(5)MgBr)rarr CH_(3)CH_(2)COCH_(3)`
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