How are protons and neutrons similar? How are they different?

They are both in the nucleus of an atom, they have different charges

Explanation:

Protons and neutrons are similar because they are both in the nucleus of the atom, being orbited by the electron(s). They are different, however, because they have different charges, the proton is positively charged and the neutron is neutral.

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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.