Which formula shown below contains 6 degrees of unsaturation ? a. C14H18 b. C17H

Question

Which formula shown below contains 6 degrees of unsaturation?

a. C14H18 b. C17H22 c. C20H20 d. C13H14

3.    Consider an electrophilic addition to an alkene. Which of the following statements is FALSE?

a. a carbocation forms during the reaction b.    the initial carbocation intermediate can undergo rearrangement c.    the reaction must follow Markovnikov’s rule d. none of the above

5. Which of the following statements regarding epoxides is TRUE?

a.   they are highly strained and therefore highly reactive b. they have little strain and therefore relatively unreactive c.   they have little strain and therefore highly reactive d. they are highly strained and therefore relatively unreactive

.1 Given that dehydration reactions typically proceed by an E1 mechanism, which of the following alcohols will undergo the fastest rate of dehydration upon treating with H2SO4 and heat.

a. butan-1-ol b. 2-methylbutan-1-ol c. butan-2-ol d. 2-methylbutan-2-ol

Explanation / Answer

(a) C14H18 has six degrees of unsaturation.

Because, for a saturated hydrocarbon with 14 carbon atoms, has the formula, C14H30.

So, there is a shotage of 12 hydrogens which corresponds to six degress of unsaturation.

(3) All electrophilic addition reactions need not to follow Markovnikoff's rule.

(5) (a) An epoxide is a three membered ring having highly strined so, it is highly reactive.

(1) E1 elemination involves the formation of carbocation intermediate in first step. So, more is the stability of carbocation more is the reactivity of that alcohol.

So, tertiary alcohol > secondary alcohol > primary alcohol

butan-1-ol and 2-methylbutan-1-lo are primary alcohols

butan-2-ol is secondary alcohol

2-methylbutan-2-ol is tertiary alcohol

So, 2-methylbuan-2-ol is more reactive in E1 elemination reaction as it forms tertiary carbocation intermediate in first step.

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