Portmess Homework Q&S 94

Portmess Homework Q&S 94 - 88 ALCOHOLS AND ALKYL...

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B-5. Rank the bond dissociation energies (BDEs) of the bonds indicated with the arrows from smallest to largest. ( a )1 , 2 , 3( d , 3 , 2 ( b )3 , 2 , 1( e , 1 , 2 ( c )2 , 3 , 1 B-6. What are the chain-propagating steps in the free-radical chlorination of methane? ( a , 4 ( b , 2 ( c ) 3, 5 ( d ) 1 ,3 ,5 ( e ) A combination different from those listed B-7. Which of the following is least able to serve as a nucleophile in a chemical reaction? ( a )B r 2 ( b )O H 2 ( c )N H 3 ( d )C H 3 1 B-8. Thiols are alcohol analogs in which the oxygen has been replaced by sulfur (e.g., CH 3 SH). Given the fact that the S @ H bond is less polar than the O @ H bond, which of the following statements comparing thiols and alcohols is correct? ( a ) Hydrogen bonding forces are weaker in thiols. ( b ) Hydrogen bonding forces are stronger in thiols. ( c ) Hydrogen bonding forces would be the same. ( d ) No comparison can be made without additional information. B-9. Rank the transition states that occur during the following reaction steps in order of increas- ing stability (least most stable): ( a , 2 , b , 3 , c , 3 , 2( d
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