Exam prep CHM 250 Secton 004, 006, 007, 008 Fall 2013 Exam II 10/17/2013 Last na

Question

Exam prep CHM 250 Secton 004, 006, 007, 008 Fall 2013 Exam II 10/17/2013 Last nane: First name: L. Maltlile dhoices (Oaly one arrect for each question. 60 polnts) 1.( Which of the following cycloalkanes has the highest heat of combustion per CHa? A. Cyclohexane BCyclopentane C.Cyclobutane Cyclopropane 2. What is the most stable conformation of cyclohexane? A. Chair B. Boat C. Planar D. Skew boat 3. )Assume you are preparing a monochlorinated alkane by free radical chlorination of following alkanes. Which one will give you only one A. 4Which of the following alcohols is the least reactive one when reacting with a monochlorinated product? hydrogen halide? C. D. OH 5.( Which of the following compounds has the highest boiling point? A. CH,CH CH OH B. CH CH F C. CH CH,OH D. CH CH:CH 6. )Which of the following compounds has the highest solubility in water? A. CH CI 7.( Which of the following four types of free radicals is the most stable one? A. Methyl free radical C. Secondary alkyl free radical D. Tertiary alkyl free radical B. Primary alkyl free radical 8. ( Which of the following carbocations is the most stable one? 9.Which of the following compounds is a heterocyclic A. 10. ( Which of the following compounds is an alcohol? A. CHyCOOCH What is the most stable conformation of ethane? A. Stagered B. Chair C. Eelipsed D. Boat 12.C Which of the following factos makes the gauche confoationf tabeing less stable than its anti conformation?

Explanation / Answer

1. Cyclopentane is more stable. It gives more combustion energy per CH2

   B. cyclopentane

2. A.Chair form

3. A ( cyclobutane)

4. D( primary alcohol)

5.C. CH3CH2OH ( due to inter molecular hydrogen bond)

6. B

7.D

tertiary> secondary> primary

8. D

tertiary carbocation> secondary carbocation> primary carbocation

9.D

10.D   (R-OH)

11.A

12.

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