Reaction of Grignard reagent with ethyl formaldehyde (HCHO) give a: a) primary a

Question

Reaction of Grignard reagent with ethyl formaldehyde (HCHO) give a: a) primary alcohol b) secondary alcohol c) tertiary alcohol d) primary alcohol + 2 extra carbons Which one of the following would not be a suitable solvent for Grignard reagents? a) diethyl ether (CH_3CH_2OCH_2CH_2) (b) THF (tetrahydrofuran) c) acetone (CH_3COCH_3) d) all are suitable How many moles of pyruvaldehyde (CH_3COCH_2CHO) could be reduced with one mole of sodium borohydride (NaBH_4)? A. 1 b. 2 c. 3 d. 4 e. 5 The reaction of Grignard reagent with ethylencoxide followed by hydrolysis yields: a. tertiary alcohol b. a ketone c. a primary alcohol d. a secondary alcohol with two extra carbons e. none of them Rank the activity of the following aromatic compounds in order of decreasing reactivity (most reactive first) A) benzene B) toluene C) benzoic acid D) phenol a. D>B>A>C b. D>C>B>A c. B>A>D>C d. B>C>D>A Which of the following statements about organometallic compounds is not true? a. organolithium reagents (RLi) react with aldehydes and ketones. b. Grignard reagents (RMgBr) react with aldehydes and ketones. c. organolithium and Grignald reagents do not react with esters. d. Grignard reagents are prepared in anhydrous ether or tetrahydrofuran (THF). Arrange the following compounds in order of decreasing chemical shift for the underlined hydrogens (largest delta value first, smallest value last). A. CH_3CH_2CH_3 B. CH_3OCH_2CH_3 C. CI_2CHCH_2CH_3 D. CICH_2CH_3 a. B>C>A>D b. B>C>D>A c. C>B>A>D d. C>B>D>A The reaction of E-2-butene with IZnCH_2I (Cu) creates a: a) cyclopropane with trans substituents b) cyclopropane with cis substituents c) diastereoselective reaction d) a mixture of the isomers Which of the following groups are not ortho/para director A. -CH_3 B. -COOCH_2CH_3 C) -OCH_2CH_3 D) -NO_2 a) B&C; b) B, C&D; c) A&C; d) B&D;

Explanation / Answer

1. reaction grignard reaction with formaldehyde will give primary alcohol (option a)

2. acetone is not suitable solvent for grignard reaction (option c)

3. pyurvaldehyde will react with 2 moles of sodium borohydride (option b)

4. answer secondary alcohol with extra carbon (option d)

5. option a. D>B>A>C

6. organolithium and grignard reagent do not react with esters (option c)

7. B>C>D>A (option b)

8. cyclopropane with trans sustitutents (option a)

9. D. NO2

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