Which of the following reagent(s) can be used to convert an ester to an aldehyde

Question

Which of the following reagent(s) can be used to convert an ester to an aldehyde (A) DIBALH/H_3O_ (B) NBS (C) H_2 (D) NaBH_4/HO^- (E) LiAH_4/H_3O^- Which of the following reagent(s) can be used to prepare CH_3CH_2CN from ethyibromide (A) CH_2(CN)_2 (B) NH_2NH_2 (C) CH_3CN (D) KCN (E) NH_3 The product expected in the following reaction is an (A) amine (B) ammonium (C) amide (D) enamine (E) imine which of the following reagent(s) can be used to convert 3methyl pentanoie acid to 3-methyl 1-pentanol? (A) H_2/PdC (B) CH_3MgBR/H_3O^- (C) NaBH_4/H_3O^- (D) LiAIH_4/H_3O^- (E) PCC Which of the following combination of reactants/reagents can be used to prepare an ether? (A)CH_2O C_2H_5MgBr/H_3O (B) C_2H_5ONa CHBr (C) C_3H_2OH/H_2SO_4 (D) CH_3ONa C_2COCl (E) C_2H_5CH_5MgBr/H_3O Which of the following reagent(s) can be used to prepare propionic acid from ethylmagnesiumbromide (A) HCOOH (B) NaCN/H_3O (C) CH_3OH/H_3O (D) CO/H_3O (E) CO_2/H_3O Product of the following reaction (A) benzoic acid (B) aniline (C) phenylmethylamine (D) benzamide (E) benzaldehyde Product of the following reaction (A) 3 ethyl 3 hexanol (B) 2 hexanone (C) 2 pentanone (D) 2 pentanol (E) 3-hexanone Which of the following reagent(s) gives the reaction below (A) CH_3MgBr (B) CH_3MgBr/H_3O (C) NsaBH_4/H_3O^- (D) LiAIH/H_3O (E) Bh_3/THF The most acidic compound of the group is: (A) CH,CHO (B) CH_2CO_2H (C) CH_2CH_2OH (D) CHCH_2COCH_3 (E) CH_3OCH_2CH_3 Product of the following reaction is: (A) phenylethene (B) ethylbenzene (C) benzyl methyl ether (D) 2-phenylethAnol (E) 1-phenylethanol The reaction between a ketone and excess alcohol in the presence of sulfuric acid catalyst gives (A) ether (B) ester (C) ketal (D) amide (E) secondary alcohol Product of the following reaction is: (A) HO(CH_2)_4 OH (B) Br(CH_2)_4Br (C) HO(CH_2)_4 Br (D) HO (CH_2)_4 Br (E) Br (CH_2)_4 Br

Explanation / Answer

The image is taken at vey bad angle. The first question that i could see clearly is no.4

Ans 4 . D) LiAlH4 / H3O+

The alcohol 3 methyl pentanol can be prepared from 3 methyl pentanoic acid by strong reducing agent such as lithium aluminium hydride.

However , LiAlH4 is an expensive agent , so it is used to prepare special chemicals only . Commercially the carboxylic acids are prepared by reduction of esters by catalytic hydrogenation.

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