Which of the following reagent(s) gives the reaction below (A) CH_3MgBr (B) CH_3

Question

Which of the following reagent(s) gives the reaction below (A) CH_3MgBr (B) CH_3MgBr/H_2O^- (C) NaBH_4/H_2O^- (D) LiAlH_4/H_3O^- (E) BH_3/THF The ketone compound of the group is: (A) CH_3CHO (B) CH_3CO_2H (C) CH_2CH_2OH (D) CHCH_2COCH_3 (E) CH_3OCH_2CH_3 Final product after two reactions 1 and 2 is: (A) 1 -phenylethanol (B) ethylbenzene (C) benzyl methyl ether (D) 2-phenylethanol (E) phenylethene Product of the following reaction is: (A) HO-(CH_2)_4-OH (B)Cl-(CH_2)_4Cl (C) HO-(CH_2)_4-Cl (D) HO-(CH_2)_2-Cl (E) Cl-(CH_2)2-Cl The reaction between formaldehyde and a Grignard reagent gives a (an) (A) ether (B) ester (C) ketal (D) primary alcohol (E) secondary alcohol

Explanation / Answer

Ans 21. D) LiAlH4/H3O+

lithium aluminium hydride is a strong reducing agent.

The ester propyl benzoate is hydrolysed in the presence of strong rducing agent such as LiAlH4 to produce benzyl alcohol and propanol

lithium alumunium hydride is an expensive agent hence commercially the alcohols are prepared by catalytic hydrogenation of esters

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