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Suggest a suitable reagent to prepare se...

Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.

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The suitable reagent used to prepare secondary alcohol using Grignard reagent is ethanal.
`underset("Ethyl magnesium bromide") (CH_(3)CH_(2).MgBr) + underset("Ethanal acetaldehyde")(CH_(3)CHO) overset("Ether")to [CH_(3)CH_(2) -overset(CH_(3))overset(|)underset(H)underset(|)C-OMgBr] overset(H_(2)O)underset(H^(+)) to CH_(3)CH_(2)underset(OH)underset(|)(CH)CH_(3) + Mg(OH) Br`
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