CHEM 140B

Midterm 1 | Winter '15 | Whitesell
The absorption in the infrared at 1720 is indicative of the presence of a:

A) Alcohol
B) Nitrile
C) Carbonyl group
D) Amine

A board absorption in the infrared centeres at 3500 is indicative of the presences of a:


A) Alcohol
B) Nitrile
C) Carbonyl group
D) Amine

The contribution of a C-C bond is:

A) 99 kcal/mole
B) 83 kcal/mole
C) 146 kcal/mole
D) 63 kcal/mole

The reduction of a simple C=Cπ bond is:

A) is endothermic by 30 kcal/mole
B) is exothermic by 30 kcal/mole
C) is extothermic by 63 kcal/mole
D) is endothermic by 63 kcal/mole

The difference in energy between 1-butene and trans-2- butene is:

A) 2.7 kcal/mole
B) 0.9 kcal/mole
C) 1.0 kcal/mole
D) 1.7 kcal/mole

The correct order of the stability of carbocations is:

A) 1°>2°>3°
B) 2°>3°>1°
C) 3°>2°>1°
D) 2°>1°>3°

The methyl groups of an iso-proply group Will appears in the proton NMR as a:

A) singlet
B) triplet
C) doublet
D) quartet

The methyl group of an ethyl group Will appear in the porton NMR as a:

A) singlet
B) triplet
C) doublet
D) quartlet

At equilibrium, two compounds that differ in energy by 4.1 kcal/mole will be in a ration of approximately:

A) 1;1
B) 10;1
C) 100;1
D) 1000;1

Provide a complete mechanism including curved arrows showing the flow of all electrons for all bond changes for the following reacton.Your answer must fit within the box provided.

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Provide a complete mechanism including curved arrows showing the flow of all electrons for all bond changes for the following reaction. Your answer must fit within the box provided.

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Provide the expected major organic product from for the following reactions. You need show stereochemistry ONLY when two stereo centers are formed in the reaction. You must place your answer in the box provided. Answer outside the boxes will not receive credit.

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The porton nmr spectrum shows below was obtained on an unknown compound. Provide a structure in the box provided that is consistent with the spectrum.

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