13. Markovnikov\'s theory states 19. What is the intermediate in the addition of

Question

13. Markovnikov's theory states 19. What is the intermediate in the addition of Brz to cyclohexene in presence of peroxides? a) An equatorial substtuent in cyclohexane results in a b) In electrophilic addition of an unsymmetrical reagent to more stable conformation than an axial substituent an unsymmetrical alkene, the electrophilic reagent will add to the carbon of the double bond bearing the c) E2 reactions occur only if the p-hydrogen and leaving d) When a reaction forms an alkene, and several greater anna occu hydrogen alana arenandera ,Br (B) group can assume an anti-coplanar arrangement possibilises exist, the more (or most) stable isomer is the one which predominates ©0" Br (D) "( 14 Which is the best way to carry out the following reaction? 20. Which of these is not formed when cyclopentene reacts with an aqueous solution of bromine? b) 1) HBr(aq)/ b) conc HBrlHaO/A c) 1) BHa THF a) b) c) d) e) 2) H:O/OH 2) NaBH/OH 21. In aqueous solution, bromine reacts with ethene to produce BrCH:CHOH as well as 1,2-dibromo ethane because a) water solvates the bromine b) this is a free radical reaction c) the intermediate bromonium ion formed may 15. The reaction of Bra/CCls to cyclohexene would produce the compound(s) represented by structure(s) react with Br or H:O d) none of these 22. Select the structure of the major product formed in the following reaction. b) II alone e) 1,11 and Ell c)Ill alone a) I alone d) II and II Which is the best way to carry out the following reaction? 16. b) conc HBr/H O/A d) 1) Hg(OAclH:O/THF 23. What product would result from the following reaction? c) 1) BH-THF e) NaOH/H:O/ How would you carry out the following reaction? There may be more than one way (circle all that do). Ph-CH2-CH=CH2 Ph-CH,- 17. Mrd. .ou OH"6H b) a) 1) KMnOu/OH/heat 2) HO b) 1) dil KMnOu/cold, 2) H2O c) 1) OsO4, 2) NaHS0 24. Which alkene would yield only CHyCHaCOOH on oxidation with hot alkaline potassium permanganate (followed by acid work-up)? a) (E)-2-hexene b) (Z)-2-hexene c) 2-methyl-2-pentene d) (E)-3-hexene 18. Addition of bromine to trans-2-hexene gives: CH CH2 H a) bne meso compound ) a racemic mixture of enantiomers c) a racemate and a meso compound d) four stereoisomers

Explanation / Answer

13. In Markovnikov's rule in addition of HX to the unsymmetrical alkene, the H bonds to the less substituted carbon (more number of hydrogen atoms) and X bonds to more substituted carbon.

Hence answer is b.

As per chegg guidelines, first question is answered.

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