Which of the following figures has all sides
equal? A. Square, B. Rectangle
c. Circle, b. cube​

the answer should be square, because by it's area formula (l²)we can tell that all it's sides are equal.but for a circle it just has a circumference and not sides.a rectangle on the other hand has only two sides equal.

but I also think the answer could be cube because all it's faces are equal.

I hope this helps

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.