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Worksheets

Carbonyl

Total questions: 15

Worksheet time: 8mins

Name
Class
Date
1.
What is the name of this carbonyl compound?
a)
pentan-2-one
b)
hexan-5-one
c)
pentan-3-one
d)
hexan-2-one
2.
Select carbonyl compounds from the following formulae:
a)
C4H10O
b)
C4H8O
c)
C4H8O2
d)
C4H8
3.

When reacted with a strong reducing agent, aldehydes turn into

a)

carboxylic acids

b)

ketones

c)

primary alcohols

d)

secondary alcohols

4.
Classify the compound based on the functional group present.
a)
aldehyde
b)
ketone
c)
carboxylic acid
d)
ester
5.

When reacted with a strong reducing agent, ketones turn into

a)

carboxylic acids

b)

ketones

c)

primary alcohols

d)

secondary alcohols

6.

An organic compound X has the following chemical properties.

· Forms a yellow precipitate when tested with 2,4-dinitrophenylhydrazine.

· Forms a yellow precipitate when it reacts with an excess iodine in alkaline solution.

Which of the following compounds is X?

a)
b)
c)
d)
7.

Which substance would test positively with 2,4-DNPH but negatively with Tollens’ reagent?

a)

Propanal

b)

Propanone

c)

Propanoic acid

d)

1-propanol

8.

Which reagent would you choose to convert 1-pentanol to pentanal?

a)

PCC in CH2Cl2

b)

K2Cr2O7 with aqueous H2SO4

c)

KMnO4 with aqueous H2SO4

d)

KOH, ethanol, reflux

9.

The only aldehyde that gives positive result with I2/NaOH is

a)

Butanal

b)

2-methylpropanal

c)

Ethanal

d)

Propanal

10.

Tollen's reagent is used to identify the presence of aldehyde by giving the result of

a)

yellow precipitate

b)

silver mirror

c)

cloudy

d)

brown precipitate

11.

Below are the reagents and conditions used for reduction except

a)

i.LiAlH4 ii. H3O+

b)

KMnO4, H+, heat

c)

NaBH4, Methanol

d)

H2, Pt

12.

What is the structural formula when cyclopentanone reacts with KCN, HCl

a)
b)
c)
d)
13.

Carbonyl compounds that give pale yellow precipitate with iodoform test must have contains..

a)

methyl carbinol group

b)

methyl carbonyl group

c)

carboxyl group

d)

carboalkoxy group

14.

The structure of 3-methyl-4-hydroxyhexanal is :

a)
b)
c)
d)
15.

Which structural formula is of 2,4-DNPH, a reagent to confirm the presence of carbonyl group.

a)

A

b)

B

c)

C

d)

D