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

Question

Which of the following reagent (s) can be used to convert an ester to aldehyde (A) DIBALH then H_3O^- (B) NBS (C) H_2 (D) NaBH_4 then H_3O (E) LiAIH_4/H_O Which of the following reagent(s) can be used to prepare CH_3CH_2CH_2-CN from I -chloropropane? (A) CH_2(CN)_2, (B) NH_2-NH_2 (C) CH_3 - CN (D)KCN (E)NH_3 The product expected in the following reaction is an; (A) amine (B) ammonium (C)amide (I)) enamine (E) imine Which of the following reagent(s) can be used to convert 3-methyl pentanoic acid to 3-methyl I pentanol? (A) H_2/Pd-C (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_3H_2Br/H_2SO_4 (C) C_2H_5ONa, C_2H_5Br (D) C_2H_2ONa, C_2H_3COCI (E) C_2H_5CHO, C_2H_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^+ Common name of the following compound (A) benzoic acid (B) aniline (C) phenylmethylamine (D) benzamide (E) benzaidehyde 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) NaBH_4/H_3O^- (D) LiAIH_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)C1 - (CH_2)_4 - CI (C) HO - (CH_2)_4 - CI (D) HO - (CH_2)_2 - CI (E) CI - (CH_2)_2 - CI 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

(19) : (D) Benzamide

(22) : (D) CHCH2COCH3, because it contains the C=O group with alkyl groups on both its sides, thus it qualifies as a ketone

(24) : (A) HO-(CH2)4-OH, this is because the THF ring opens on reaction with aqueous to form alcohol

(25) : (D) Primary alcohol, the reaction taking place can be represented as:

RMgBr + HCHO ----> RCH2OH

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