5 Chemistry Problems

1. Which of the following correctly lists the following isomeric alkanes in order of increasing boiling point? n-hexane, 2,3-dimethylbutane, 2-methylpentane a. n-hexane < 2-methylpentane < 2,3- dimethylbutane b. 2-methylpentane < 2,3-dimethylbutane < n-hexane c. 2,3-dimethylbutane < 2-methylpentane < n-hexane d. n-hexa ...continues

Experimental analysis

The attached document gives the procedure and results for a hypothetical experiment. Four questions follow the information provided. Please answer those four questions. (See attached file for full problem description) --- A certain experimental procedure is as follows: 1. You react an unknown alcohol with acetic anhyd ...continues

Reaction Mechanism

Beginning with acetylene and using any other reagents necessay, how would you synthesize 1,2-dichloropropane? (Hint: more than one step is required. Show all reagents and all intermediate steps clearly.)

Reaction Mechanism

Predict the two most likely products for the following reaction and show a stepwise mechanism for the formation of each product. (Hint: one product is formed by Markovnikov addition, the other by a carbocation rearragement.) (CH3)3CCH=CH2 + HCl ->

Reaction Mechanism

Consider the following molecule and answer the questions related to its structure. a. Determine the R or S configuration for each chiral center. See attached file for full problem description.

Tertiary hydrogen and bromination problems

1. The compound hexane, CH3-CH2-CH2-CH2-CH2-CH3 has how many tertiary hydrogens? 2. How many monobromination products of pentane might be expected?

Chemistry

1. In a free radical reaction, the following step would be categorized as CH3. + Br . ----------> CH3Br a. Initiation b. Propagation c. Substitution d. Termination 2. The heat of reaction (enthalpy change, delta H) for the following reaction is I2 + CH4 -----------> CH3I + HI a. 13 kcal/mol b. 140 kca ...continues

Chemistry

1. An energy maximum in a reaction-energy diagram would be labeled as which of the following? a. Reactant b. Product c. Transition State d. Intermediate 2. Which of the following best describes the shape of the methyl free radical? a. linear b, planar c, tetrahedral d. pyramidal

Reaction Mechanism

I need help with writing the reaction and predict the major product for the following reactions. (Make sure to consider stereochemistry and regiochemistry, if applicable) a) 1-butene-3-yne reacts with excess hydrogen in the presence of a Pd/C catalyst b) 1-Butyne reacts with BH3 followed by hydrogen peroxide.

Chemistry

1. In the bromination of n-butane, the secondary hydrogens are 20 times more reactive than the primary hydrogens. What is the product ratio of 1-bromobutane to 2-bromobutane? a. 6:4 b. 1:20 c.93:7 d. 7:93 2. Rank the free radicals (I-III) shown below in order of decreasing stability (ie, most stable to least s ...continues