Which functional group is least polar? see section 2.5 ( page 74) . hints which functional group is least polar? see section 2.5 ( page 74) . sulfhydryl carboxyl. hydroxyl amino?

Answer;

-Amino group

Explanation;

-Functional groups are groups of atoms that occur within organic molecules and confer specific chemical properties to those molecules.

-A functional group can participate in specific chemical reactions. Some of the important functional groups in biological molecules include: hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl groups. These groups are usually classified as hydrophobic or hydrophilic depending on their charge or polarity.

Least polar function group is amino

Explanation:

Polarity of a given functional group depends on the electronegativity difference of the atoms that constitute the functional group.

Sulfhydryl = -SH

Carboxyl = -COOH

Hydroxyl = -OH

Amino = -NH2

Here: Oxygen 'O' is most electronegative, followed by sulfur, 'S' and finally nitrogen 'N'

Therefore an O-H bond will be more polar than, S-H and followed by the N-H bond.

Since the -COOH group has two electronegative 'O' atoms it will be most polar. The decreasing order of polarity would be:

carboxyl > hydroxyl > sulfhydrl > amino

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