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Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1

25 Questions MCQ Test Additional Question Bank | Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1

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This mock test of Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1 for Class 9 helps you for every Class 9 entrance exam. This contains 25 Multiple Choice Questions for Class 9 Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1 quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1 exercise for a better result in the exam. You can find other Aldehydes Ketones And Carboxylic Acids Practice Quiz - 1 extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.

QUESTION: 1

IUPAC name of CH₃CHO is

A.
Ethanal
B.
Acetaldehyde
C.
Formaldehyde
D.
None of the above

Solution:

CH₃CHO is ethanal

QUESTION: 2

Arrange the following sets of compounds in order of their increasing boiling points : Pentan – 1 – ol, butan – 1 – ol, butan – 2 – ol, ethanol, propan – 1 – ol, methanol

A.
Propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol
B.
Butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol, methanol, ethanol, propan – 1 – ol,
C.
Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol, pentan – 1 – ol.
D.
Pentan – 1 – ol Methanol, ethanol, propan – 1 – ol, butan – 2 – ol, butan – 1 – ol,

Solution:

Boiling point is α Vanderwall forces α Molecular weight.

QUESTION: 3

One mole of a symmetrical alkane on ozonolysis gives two moles of an aldehyde having molecular mass of 44u. The alkene is.

A.
Propene
B.
1 – butene
C.
2 – butene
D.
Ethene

Solution:

2-butene on reductive ozonolysis will give CH₃CHO which has molecular mass of 44u.

QUESTION: 4

IUPAC name of the following compound is

A.
1 – methoxy – 1 – methylethane
B.
2 – methoxy – 2 – methylethane
C.
isopropylmethyl ether
D.
2 – methoxypropane

Solution:

This is 1-methoxy-1-methylethane.

QUESTION: 5

Which sequence of steps below describes the best synthesis of 5 – oxohexanoic acid starting with 1 – methylcyclopentan – 1 – ol?

Solution:

5 – oxohexanoic acid starting with 1 – methylcyclopentan – 1 – ol can be synthesized using conc H₂SO₄ which will cause dehydration forming alkene which with KMnO₄ opens the ring and forms 1 – methylcyclopentan – 1 – ol.

QUESTION: 6

The compound which forms acetaldehyde when heated with dilute NaOH is

A.
1 chloro ethane
B.
1, 1, 1 trichloro ethane
C.
1, 2 dichloro ethane
D.
1, 1 dichloro ethane

Solution:

QUESTION: 7

Ketones are reduced to the corresponding alcohols by catalytic hydrogenation to form

A.
tertiary alcohols
B.
primary alcohols
C.
secondary alcohols
D.
None of these

Solution:

Ketones reduction give secondary alcohols.

QUESTION: 8

For making distinction between 2 – pentanone and 3 – pentanone the reagent to be employed is

A.
SeO₂
B.
K₂Cr₂O₇/H₂SO₄
C.
Iodine/NaOH
D.
Zn – Hg/HCl

Solution:

2-pentanone will give iodoform but 3-pentanone will not give.

QUESTION: 9

The following compound is called?

A.
4 – nitrobenzenecarbaldehyde and 4 – nitrobenzaldehyde
B.
4 – nitrobenzaldehyde
C.
4 – nitrobenzenecarbaldehyde
D.
None of these

Solution:

This is 4 – nitrobenzenecarbaldehyde and 4 – nitrobenzaldehyde

QUESTION: 10

One of the following is used for the separation and purification of aldehydes

A.
Sodium hydrogensulphite
B.
Hydrogen cyanide
C.
Grignard reagent
D.
None of these

Solution:

NaHSO₃ is used for purification of aldehydes.

QUESTION: 11

CH₃CH(OCH₃)CHO is called?

A.
Methoxypropionaldehyde and 2 – Methoxypropanal
B.
2 – Methoxypropanal
C.
Methoxypropionaldehyde
D.
None of these

Solution:

This is Methoxypropionaldehyde or 2 – Methoxypropanal

QUESTION: 12

The aldehydes and ketones undergo one of the following reactions.

A.
substitution reaction
B.
electrophilic addition reactions
C.
nucleophilic addition reactions
D.
None of these

Solution:

Aldehydes and Ketones undergoes nucleophilic addition reaction .

QUESTION: 13

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called?

A.
Wolff – Kishner reduction
B.
Dow reduction
C.
Cope reduction
D.
Clemmensen reduction

Solution:

Clemmenson is the reaction of carbonyl compounds with Zn amalgam in presence of conc. HCl to convert them to alkanes.

QUESTION: 14

The product formed in Aldol condensation is

A.
a beta – hydroxy aldehyde or a beta – hydroxy ketone.
B.
a beta – hydroxy acid
C.
an alpha, beta unsaturated ester
D.
.an alpha – hydroxy aldehyde or ketone.

Solution:

In aldol we get beta hydroxyl aldehyde/Ketone.

QUESTION: 15

The carbonyl carbon atom

A.
sp² – hybridised
B.
forms three sigma (σ) bonds
C.
forms a π – bond with oxygen
D.
All of these

Solution:

R₁R₂C=O is carbonyl so 3 sigma bond and 1 pie bond.

QUESTION: 16

The following reaction is

A.
Etard reaction.
B.
Friedel – Crafts reaction
C.
Gatterman – Koch reaction
D.
Stephen reaction

Solution:

This is Friedal Craft reaction.

QUESTION: 17

Prop – 2 – enal is called?

A.
Veleraldehyde
B.
Acrolein
C.
Phthaldehyde
D.
None of these

Solution:

this is Acrolein.

QUESTION: 18

A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives

A.
sodium benzoate and methyl alcohol
B.
benzyl alcohol and methyl alcohol
C.
benzyl alcohol and sodium formate
D.
sodium benzoate and sodium formate

Solution:

They will undergo cannizaro reaction.

QUESTION: 19

Ozonolysis of alkenes followed by reaction with zinc dust and water gives depending on the substitution pattern of the alkene

A.
ketone
B.
a mixture of both aldehyde and ketone
C.
aldehyde
D.
All of these

Solution:

Reductive ozonolysis yields aldehyde or ketone.

QUESTION: 20

Which of the following has most acidic hydrogen?

A.
2, 3 – Hexanedione
B.
2, 5 – Hexanedione
C.
3 – Hexanone
D.
2, 4 – Hexanedione

Solution:

2, 4-hexanedione will have active metylene group.

QUESTION: 21

Esters react with DIBAL – H to produce

A.
Aldehydes
B.
Carboxylic acids
C.
Ketones
D.
None of these

Solution:

Esters are reduced to aldehydes with DIBAL-H.

QUESTION: 22

Clemmensen reduction of a ketone is carried out in the presence of which of the following?

A.
H₂ and Pt as catalyst
B.
Zn – Hg with HCl
C.
Glycol with KOH
D.
LiAlH₄

Solution:

For Clemmenson we use Zn-Hg(conc HCl )

QUESTION: 23

The correct sequence of steps involved in the mechanism of Cannizzaro's reaction is

A.
electrophilic attack by OH^– , transfer of H⁺ and transfer of H^–
B.
transfer of H⁺, nucleophilic attack and transfer of H^–
C.
nucleophilic attack, transfer of H^– and transfer of H⁺
D.
None of the above

Solution:

In cannizaro reaction 1st nucleophile OH⁻ attacks on carbonyl carbon. Then hydride shifting take place. Followed by proton transfer.

QUESTION: 24

Aldehydes are prepared by reducing nitriles to corresponding imines with stannous chloride in the presence of hydrochloric acid. This reaction is called?