Question

D 2. A leaving group is a species that is pretty stable when it gains 2 electrons is a tertiary carbon is always a halide stays attached to a molecule D 3. After SN2 reaction, the stereochemistry of a chiral carbon randomizes (equal mix of R/S stereoisomers) is unchanged 100% inverts stereochem is unimportant and tells us nothing useful in SN2

Answer 1

ANSWER -QUES -2

Leaving group is a molecular fragment that departs from a molecule with an electron pair in heterolytic bond cleavege of that molecule.

For being a leaving group it is very important and necessary condition that the group which leaves will become stabilized after removal from molecule.

For ease of understanding some examples of leaving group are given in figure 2.( Please see images) & figure 3. These all are resonance stabilized. L

For halide Flourine is unstable as it is smaller in size. (Figure 3)Thus we can see that halides are not living group always.

Hence it is clear that in question number 2 you first option is correct.

Question-Answer3

Experimental evidences so that all SN2 reactions proceed with inversion of configuration. That means nucleophile attack from the backside of the the leaving group

It has two reasons first that nucleophile attack on the the antibonding molecular orbital of leaving group which present in in back side or opposite side of the living group.

It's second reason that leaving group have electron density a andit is is bulky due to which it cause steric repulsion.

You can see its example in figure 4.

Thus in case of SN2 reaction always 100% inversion occurs.

Hence correct option for question 3 is option number third that is 100% inversion.

OUESTION ANSWER 1

Nucleophile are those species which are electron rich. Due to increase amount of electrons nucleophiles tends to attack at the position of electron deficient centres.

We can say that nuclear files are nucleus loving species. The word nucleophile consists of two words nucleus + Phile. Which indicates that which attracted towards nucleus. Actually files Phile word indicate the synonym of of loving or attracting. So for telling about any nucleophile you can say that it is nucleus attracting species.

Thus overall nuclear files are electron rich species.

Hence for question number 1 is option number 4.
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