Given a formula of a functional group: An organic compound that has this functional group is classified as 1) an organic acid 2) an ester 3) a ketone 4) an aldehyde

Since the formula of the functional group is not given in the question, here are possible answers; If it is;

1. -COOH or -CO2H, it is an organic acid

2. -COOR, it is an ester

3. RC=O, it is a ketone

4. HC=O, it is an aldehyde

Note: Check the attachment below

Explanation:

The functional group of an organic compound is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.

The most common functional groups are:

Carbonyls (C=O); which includes the aldehydes, HC=O, and ketones, RC=O

Alcohols (-OH),

Carboxylic (organic) acids (COOH),

Edters (COOR), and

Amines (NH2).

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally