Take a look at the guidewords listed below. if you wanted to look up the word curiosity, from “rikki-tikki-tavi,” in a dictionary, on which page would you search coupon – cousin cow – coyote cure – current curricular – cushion

i believe that it is a exoplanet

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.

4d^55s^1 ( third choice)