Hydrocarbons

Question 1

Explain what would be the major product of HBr + prop-1-ene using markovnikoffs rule.

Answer 1

Major product: 2-bromopropane
Minor : 1-bromopropane

Reason: the carbocation formed when the H adds to the C with the most Hydrogesn already in the double bond will from the most stable carbocation intermeditpate because it has the most alkyl groups.

Question 2

What are the products of adding prop-1-ene to cold dilute acidified KMnO4 VII?

Answer 2

Product is propane-1,2-diol

Question 3

What’s the product of adding hot concentrated acidified KMnO4 to prop 1 ene

Answer 3

Products are ethanal and methanal,

And we know that methanol is easily further oxidized to methanoic acid which is then oxidized to co2 and water.

So if a gas is released, (co2) we know that one of the carbons in the double bond had 2 H’s

Question 4

How would make a alkene form a Halogenoalkanes alkane ?

Answer 4

Reagent: naoh ethanolic
Conditions: heat
Name of reaction: elimination
Products: alkene plus water plus NaX, x is a halogen

Question 5

How would you make an alkene from a alcohol

Answer 5

Use Al2o3 catalyst that is heated and an elimination of h2o happens and u get alkene plus h2o

Question 6

Other than al2o3 what can u use to dehydrate an alcohol

Answer 6

U can use concentrated acid that’s heated

Question 7

Write the reaction of steam plus alkene

Answer 7

Alkene plus steam makes alcohol
The reaction is reversible

You returns h3po4 catalyst