12. of the fellowing alohols will dchydrase mest rapidly with sulfunic acid and heat? oln Which of the following reactions has a mechanism that involves the formation of a cyelic intermediate from acyclic starting materials? A dehydration of an alcohol B. addition of HBr to an alkene C. chlorination of an alkanc D. addition of bromine to an alkene 14 Which of the following radicals is the most stable? 15. Describe the indicated C-H bond indicated below in terms of orbital overlap CH3-CH-CH2 (A) sp3-sp (B) sp3-sp (C) sp2-1s (D) sp-1s 16 The following process demonstrates: 0 ?? (B) conjugation (C) racemization (D) tautomerism (A) resonance 17. Which of the following compounds is a conjugated diene? A. 1,3-pentadiene C. 1,4-cyclohexadiene B. 1,4-pentadiene D. 1,5-hexadiene Solution 12. Option A, since it forms more stable tertiary carbocation 13. Option D since it forms three membered cyclic bromonium ion 14. Option A, since order of radical stability:3°>2°>1° 15. Option C, since double bonded carbon is sp2 hybridization and hydrogen is 1s 16. Option D, Tautomerism, keto - enol Tautomerism 17. Option A, Conjugate dienes are those which have alternate double bonds .