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To prepare 3-ethylpentan-3-ol, the reagents needed are 

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To prepare 3-ethylpentan-3-ol, the reagents needed are 

(a) CH3CH2MgBr + CH3COCH2CH3  

(b) CH3MgBr + CH3CH2CH2COCH2CH3 

(c) CH3CH2MgBr + CH3CH2COCH2CH3 

(d) CH3CH2CH2MgBr + CH3COCH2CH3

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(c) CH3CH2MgBr + CH3CH2COCH2CH3 

3-Ethyl-pentan-3-ol is a tert-alcohol which can be prepared from ketones and Grignard reagent The above structure of the alcohol clearly indicates that the ketone and Grignard reagents are CH3CH2COCH2CH3 and CH3CH2MgBr respectively.

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