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GOC - Class 12 MCQ

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30 Questions MCQ Test - GOC

GOC for Class 12 2024 is part of Class 12 preparation. The GOC questions and answers have been prepared according to the Class 12 exam syllabus.The GOC MCQs are made for Class 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for GOC below.

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GOC - Question 1

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Which of the following functional groups are poosible in C₄H₈O₂

A.
Carboxylic acid
B.
Hydroxy ketone
C.
Hydroxy aldehyde
D.
all of these

Detailed Solution for GOC - Question 1

Conceptual

GOC - Question 2

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The compound is known by which of the following names?

A.
Bicyclo [2,2,2] octane
B.
Bicyclo [2,2,1] octane
C.
Bicyclo [1,2,1] octane
D.
Bicyclo [1,1,1] octane

Detailed Solution for GOC - Question 2

Conceptual

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GOC - Question 3

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Which of the following have only 2⁰ H-atom?

Detailed Solution for GOC - Question 3

Conceptual

GOC - Question 4

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Consider the following statements :

(a) is more stable than

(b) is more stable than

(d) is more stable than

of these statements :

A.
1 and 2 are correct
B.
3 and 4 are correct
C.
1,2 and 3 are correct
D.
2,3 and 4 are correct

Detailed Solution for GOC - Question 4

Carbocation in sp hybridised whereas in is more stable than

GOC - Question 5

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Most acidic compound is:

Detailed Solution for GOC - Question 5

Carboxylc acids are stronger acids than alcohols & -NO₂ is a strong- I substituent, so, it increases acidic character.

GOC - Question 6

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Most stable carbanion is :

Detailed Solution for GOC - Question 6

Stability of carbanion is favoured by higher s-character (a) is sp hybridised, (b) & (d) are sp² & (c) is sp³

GOC - Question 7

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(1)

(2) CH₃ — CH=CH₂

(3) CH₃ — CH₃

C—C single bond distance would be :

A.
1 (146 pm) 2 (151 pm) 3 (153 pm)
B.
1 (151 pm) 2 (146 pm) 3 (153 pm)
C.
1 (146 pm) 2 (153 pm) 3 (151 pm)
D.
1 (153 pm) 2 (146 pm) 3 (151 pm)

Detailed Solution for GOC - Question 7

Bond length decreases with increase in s-character of combining orbitals. bond in compound
(1) involves sp²-sp² overlap
(2) involves sp²-sp³ overlap
(3) involves sp³-sp³ overlap

GOC - Question 8

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The total number of benzene derivatives having the molecular formula C₇H₇CI is :

A.
2
B.
3
C.
4
D.
5

Detailed Solution for GOC - Question 8

GOC - Question 9

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Tautomerisum is not exhibited by :

A.
B.
(CH₃)₂CHNO₂
C.
D.
(CH₃)₃CCHO

Detailed Solution for GOC - Question 9

has II— polar bond but does not have bond ∝-Hydrogen.

GOC - Question 10

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Which of the following compounds is not chiral?

A.
DCH₂CH₂CH₂CI
B.
CH₃CHDCH₂CI
C.
CH₃CHCICH₂D
D.
CH₃CH₂CHDCI

Detailed Solution for GOC - Question 10

Chiral Compounds have assymetric centre.

GOC - Question 11

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Which of the following species is an electrophile?

A.
RNH₂
B.
SO₃
C.
D.
ROH

Detailed Solution for GOC - Question 11

Electrophiles are electron loving compounds or attacking reagents. SO₃ acts as electrophile due to presence of polar II— bond

GOC - Question 12

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Which one is most stable free redical?

Detailed Solution for GOC - Question 12

Free radical is electron deficient intermediate stabilised by + I & + R effect (a) is 3⁰ allyl.

GOC - Question 13

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Select the correct option for stability of following resonance structure:

A.
x > y > z
B.
z > y > x
C.
y > z > x
D.
y > x > z

Detailed Solution for GOC - Question 13

Correct Answer :- D

Explanation : a) More stable because it has no charge.

b) More stable than (III) and (I) as it has negative charge on electronegative atom.

c) Least stable

The correct option is y > x > z

GOC - Question 14

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Which comparison is not correct as indicated?

A.
(acidic nature)
B.
(basic nature)
C.
(stability)
D.
(acidic nature)

Detailed Solution for GOC - Question 14

is a weaker base due to -R-effect of benzene

GOC - Question 15

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In the structure:

the configurations at the chiral centres are:

A.
2S,3R
B.
2R, 3R
C.
2R, 3S
D.
2S, 3S

GOC - Question 16

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Increasing order of stability among the three main conformations (i.e., Eclipse, Anti and Gauche) of 2-fluoroethanol is:

A.
Gauche, Eclipse and Anti
B.
Eclipse, Anti and Gauche
C.
Anti, Gauche and Eclipse
D.
Eclipse, Gauche and Anti

Detailed Solution for GOC - Question 16

In this compound gauche is more stable than anti, due to H-bonding

GOC - Question 17

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The alkene that exhibits geometrical isomerism is :

A.
2-butene
B.
2-methyl-2-butene
C.
propene
D.
2-methyl propene

Detailed Solution for GOC - Question 17

Conceptual

GOC - Question 18

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In the Newman projection for 2,2-dimethylbutane :

X and Y can respectively be:

A.
H and H
B.
H and C₂H₅
C.
C₂H₅ and H
D.
CH₃ and CH₃

Detailed Solution for GOC - Question 18

configuration is studied around C-2 & C-3

GOC - Question 19

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Which of the following is correct set of physical properties of the geometrical isomers?

and

A.
Dipole Boiling point Melting point Stability

I > II I > II II > I I > II
B.
Dipole Boiling point Melting point Stability

II > I II > I II > I II > I
C.
Dipole Boiling point Melting point Stability

I > II I > II I > II I > II
D.
Dipole Boiling point Melting point Stability

II > I II > I I > II I > II

Detailed Solution for GOC - Question 19

Given compounds are Cis & trans but Cℓ & CH₃ are different groups, So, displacement of electrons in trans form is unidirectional. Hence trans has higher dipole.

GOC - Question 20

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Which of the following is the most acidic compound?

Detailed Solution for GOC - Question 20

Anion formed after loss of H⁺ ion is aromatic, so, it is most acidic

GOC - Question 21

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The hybridisation of carbons in 1, 3-butadiene is :

A.
sp²
B.
sp, sp³
C.
sp², sp³
D.
sp,sp², sp³

Detailed Solution for GOC - Question 21

each C-atom 3σ— has bonds, so, they are sp² hybridised.

GOC - Question 22

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Arrange the following in correct order of nucleophilicity :

A.
IV > III > II > I
B.
I > II > III > IV
C.
III > IV > II > I
D.
II > I > IV > III

Detailed Solution for GOC - Question 22

Nucleophilicity is directly proportisonal to basic character. Increase in +I effect, increases nucleophilicity. (i) & (ii) have - I - substituents

GOC - Question 23

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The correct decreasing order of pK_b is :

A.
I > II > III > IV
B.
III > IV > II > I
C.
II > III > IV > I
D.
IV > II > I > III

Detailed Solution for GOC - Question 23

, higher pK_b means weaker base

GOC - Question 24

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Among the following, the optically inactive compound is:

Detailed Solution for GOC - Question 24

compound (a) has umbrella inversion despite of chiral centre, it is optically inactive.

GOC - Question 25

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The IUPAC name of neopentane is :

A.
2-methylbutane
B.
2,2-dimethylpropane
C.
2-methylpropane
D.
2,2-dimethybutane

Detailed Solution for GOC - Question 25

GOC - Question 26

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Which one of following does not have sp² hybridized carbon?

A.
Acetone
B.
Acetamide
C.
Acetonitrile
D.
Acetic acid

Detailed Solution for GOC - Question 26

GOC - Question 27

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IUPAC name for the compound given below is :

A.
E-2-chloro-3-iodopent-2-ene
B.
Z-2-chloro-3-iodpent-2-ene
C.
E-3-iodo-4-chloro-3-pentene
D.
Z-3-iodo-4-chloro-3-pentane

Detailed Solution for GOC - Question 27

GOC - Question 28

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Indicate the wrongly named compound :

A.
(4-methyl-1-pentanal)
B.
(4-methyl-2-pentyn-1-oic acid)
C.
(2-methyl-1-pentanoic acid)
D.

Detailed Solution for GOC - Question 28

Ketone is preferred over alkene Hex -3-en-2-one

GOC - Question 29

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Which of the following compounds has wrong IUPAC name ?

Detailed Solution for GOC - Question 29

Hydroxy is a preferred functional group. So, correct name is 3-Methyl butan-2-ol

GOC - Question 30

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Decreasing order of bond length is:

(I) C₂H₄
(II) C₂H₂
(III) C₆H₆
(IV) C₂H₆

A.
IV > III > I >II
B.
I > II > IV > III
C.
II > I > IV > III
D.
IV > I > III > II

Detailed Solution for GOC - Question 30

Bond length is inversely proportional to bond order
C₂H₄(2)
C₂H₂(3)
C₆H₆(1.5)
C₂H₆(1)

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