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How many isomar of C(4)H(8)O when react ...

How many isomar of `C_(4)H_(8)O` when react with `CH_(3)MgBr` followed by acidification to give `2^(@)` alcohol?

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The correct Answer is:
2
(a) `CH_(3)-CH_(2)-CH_(2)CHO underset((ii) H^(+))overset((i) CH_(3)MgBr)rarr 2^(@)` alcohol
(b) `CH_(3)-overset(CH_(3))overset(CH)-CHO underset((ii) H^(+))overset((i) CH_(3)MgBr)rarr 2^(@)` alcohol
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