Question

Which of the following categories of compounds will be soluble in 5% NaOH (aq) if they are not soluble in water?

A aldehydes

B alcohols

C amines

D carboxylic acids

Which of the following categories of compounds will be soluble in 5% HCl (aq) if not soluble in water?

A carboxylic acids

B alcohols

C amines

D aldehydes

Which of the following IR information is most indicative a compound is an aldehyde or ketone? Note: The question formatting will now allow for super script -1 so the term reciprocal centimeters are used in place of cm^-1

A

strong peaks between 2850-3000 reciprocal centimeters

B

strong sharp peak between 1650-1800 reciprocal centimeters

C

a medium sharp peak at 2250 reciprocal centimeters

D

strong broad peak between 3200-3600 reciprocal centimeters

Answer 1

i) Which of the following categories of compounds will be soluble in 5% NaOH (aq) if they are not soluble in water?

Answer: Carboxylic acids

Explanation

Carboxylic acid is converted to carboxylate anion in the presence of NaOH.

ii) Which of the following categories of compounds will be soluble in 5% HCl (aq) if not soluble in water?

Answer: Amines

Explanation

Amines are protonated in the presence of acid

iii) Which of the following IR information is most indicative a compound is an aldehyde or ketone? Note: The question formatting will now allow for super script -1 so the term reciprocal centimeters are used in place of cm^-1

Answer: Strong peaks between 2850-3000 reciprocal centimeters

Explanation

=C-H stretching of aldehyde is observed at 2850-3000 cm^-1