Which of the following are true statemtents about isomers/isomerization ?

Question

a) Looking at a pair of Optical isomers one would see different
types of chemical bonds in each isomer, however these bonds would have similar spatial arrangements


b) Optical isomers can have different chemical properties


c) A coffee cup and its mirror image are identical, they are superimposable


d) The mirror image of your left hand appears the same as your right hand, i.e. not superimposable

NOTE: there can be more than one answer

any help would be greatly appreciated!!! i saw this question in other posts, but there were different answers from all of them, so just curious if anyone else was sure of the answer they had... thanks again! =]

Answer 1

In chemistry, isomers are molecules with the same chemical formula and often with the same kinds of bonds between atoms, but in which the atoms are arranged differently. By definition this means that two different isomers have different spatial arrangements.

By analogy, your left hand and your right hand are like isomers, ie, they are built the same, work the same, but have opposite configurations.

Many isomers may be mirror images of each other, but others do not fit this analogy.

Concerning the multiple choice above :
a) is false ... the chemical bonds are the same, its the arrangement that is different
b) true... mostly ... sometimes alternate stereochemistry does change reactivity
c)false ... this is a misleading question. One instance can occur to make this true tho. If the coffee cup were plain, solid, without any picture or letters, and if it were placed infront of the mirror symetrically, ie, perpendicular, then the mirror image would be superimposable. But, say your plain diner coffee cup was slightly turned, then the mirror image would not be superimposable, ie, the handles would not line up.
d)false, the mirror image of the left hand IS superimposable on the right hand.

Answer 2

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Answer 3

(a) Wrong

(b) Right.

(c) Right

(d) Right.