benedicts, tollens, and feigling

Question 1

Tollens reaction with aldehydes

Answer 1

silver mirror forms

Question 2

Tollens reaction with ketones

Answer 2

no reaction

Question 3

Benedicts solution with aldehydes

Answer 3

red precipitate of CuCO3 forms

Question 4

Benedicts solution with ketones

Answer 4

no reaction (remains blue)

Question 5

Fehling’s solution with aldehydes

Answer 5

brick red precipitate forms

Question 6

Fehlings solution with ketones

Answer 6

no reactions

Question 7

Bromine water with alkane

Answer 7

very slow reaction, requires heat

Question 8

Bromine water with alkene

Answer 8

Orange to colourless quickly.

Question 9

Potassium dichromate on primary alcohols (colour change too)

Answer 9

carboxylic acid/aldehydes
orange to green

Question 10

Potassium dichromate on secondary alcohols (colour change too)

Answer 10

ketone
orange to green

Question 11

potassium permanganate on primary alcohols (colour change too)

Answer 11

carboxylic acid/aldehydes
(purple to colourless)

Question 12

potassium permanganate on secondary alcohols (colour change too)

Answer 12

ketones
(purple to colourless)