4. Draw all the chiral mono-chloro isomers of 3-methylpentane. How many pairs of enantiomers are there for the following: a. 2.3-dibromo-4-chloropentane b. 2.4-dibromo-3-chloropentane

See the explanation

Explanation:

Inside this question we have different questions:

1. Draw all the chiral mono-chloro isomers of 3-methylpentane.

2. How many pairs of enantiomers are there for the following:

a. 2.3-dibromo-4-chloropentane

b. 2.4-dibromo-3-chloropentane

Lets start with the first one. In this question, we have to draw the products of a reaction called chlorination. In this reaction, we have a "Cl" atom into the molecule. Additionally, we only can add one "Cl" in each molecule (mono-chlorination), so we can have several options (see figure 1).

In the second question, first, we have to identify how many chiral carbons we have for both molecules. In a molecule, we have three chiral carbons, so we will have 8 enantiomers  () (see figure 2). In b molecule we have two chiral carbons we will have 4 enantiomers () (see figure 3).

I hope it helps!

there is none because earth is stationary and flat.