In what region of the 1H-NMR spectrum would you expect to observe signals for hy

Question

In what region of the 1H-NMR spectrum would you expect to observe signals for hydrogens
bound to an alkene carbon?

CHE202/4 Final Exam B 1. (44 pts) Circle the correct answer for each question. (4 points each) (a) In what region of the 1H-NMR spectrum would you expect to observe signals for hydrogens bound to an alkene carbon? (A) 1.0 1.5 (B) 5.0 6.0 (C 7.0-8.0 (D) 9.5-10.5 (b) Which of the following reagents will convert cyclohexene into cis-1,2-cyclohexanediol? (A) OsO4 (CH3,COOH, (CH3,COH and HOT (B) HIO. (C) Os followed by Zn H2O. (D CH,CO H (peroxyacetic acid) followed by HOlH20. (c) Which of the following compounds will not react with CH3CHO to form a cyclic acetal. HO OH (B) (A) OH (D) (C) OH HO OH (d) Which of the following ring substituents most strongly deactivates a benzene ring towards electrophilic substitution by Brz? (A) NCCH3. (B) OCH (C)-CF (D) NO2 (e) Polymers which soften on heating and harden when cooled are called: (b) Thermoplastics (a) Thermosetting polymers (c Cross-linked polymers (d) Copolymers 2 of 17

Explanation / Answer

answer=

1..option (b) ......{5.0-6.0} alkene hydrogen

2...option (A)...IS CORRECT [ OsO4] GIVE CIS ADDITION ALWAYS

3 option (c) is correct ,, when we see chair conformation sterio of molecule not allowed.

4 option (d) is correct. becuase high (-) I effect cause ortho and pera position deactivated and meta product found.

5 option (b) is correct. thermoplastic soft on heating while hard on cooling..

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