If the activation energy, ea, is 126 kj/mol and the rate constant at 30°c is 9. 8 × 10-3 min-1, what is the rate constant at 50°c.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

the answer is 0.42 is that is an option. this question provides no info