Exams What is the major product? 8. 11. What is the major product? NaBH4 1. BH,

Question

Exams What is the major product? 8. 11. What is the major product? NaBH4 1. BH, THF 2.H 02 NaOH OCH-CH3 CH CHOH 0 OCH2CH3 (B) O (C) HOH 12. Which atoms have a & charee? OCH2CHs (D) HOH (A) 1 and iv (C) 11 and (B) 1 and I (D) II and 9. What are the major products? 13. Based on the reaction coondinate diagram, which statement is true? H2 Pd (A) 1 and 2 (C) 2 and 3 Which product will be formed in the highest yield from (B) 3 and4 1,2,3, and 4 (A) 1 is the kinetic product, 2 is the thermodynamic (B) 1 is the thermodynamic product, 2 is the kinetic (C) 1 is the kinetic and thermodynamic product (D) Which reagent would be best to bring about this (D) 10. the following reaction? Br HNO3 H2SO4 2 is the kinetic and thermodynamic product Br (B) HO3S Br 14. transformation? HO3S 0 Br (D) ON Br Cl (A) CH,CH Li (C) (CH,CH) CuLi (D) (B) CH,CH.Mgc CH,CH Br

Explanation / Answer

8) option C is correct

Explanation: NaBH4 is a mild reducing agent which reduces ketone to secondary alcohol and it cannot reduce ester group.

9) option A is correct

Explanation: H2, Pd reduces alkene to alkene. Addition of H2 is syn addition.

10) option C is correct

Explanation; -Br is an electron donating group which directs the incoming electrophile to para position.

11) option C is correct

Explanation; Hydroboration - oxidation of alkene with BH3, THF and H2O2, NaOH produces less substituted alcohol as product.

12) option C is correct

Explanation: cabronyl carbon and carbon at 1,4-position has partial positive charge.

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