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11th Chemistry Weekly Test - 3 ( Basic concept of organic reactions )

MABS Institution

11th Chemistry Weekly Test - 3 ( Basic concept of organic reactions )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

The most stable carbocation is

\(C{ H }_{ 3 }-\overset { + }{ C } { H }_{ 2 }\)
\(C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 3 }\)
\(C{ H }_{ 2 }=CH-\overset { + }{ C } { H }_{ 2 }\)
\(\overset { + }{ C } { H }_{ 3 }\)

Which one of the following species has tendency to show +1 effect?

-NH₂
-CI
-C₆H₅
-CH₃

Electromericeffectinvolvesthe complete transfer of

σ-electron
π-electron
proton
both σ and π electrons

Which one of the following is not electrophile?

NH₃
AlCl₃
FeCl₃
R-X

In which of the following, the group attached to the benzene ring shows +R effect?

All of these

Heterolytic fission of C-Br bond results in the formation of

free radical
Carbanion
Carbocation
Carbanion and Carbocation

Which of the following is heterolytic compound?

Pyrrole
Furan
Thiophene
All of these

Which one of the following has least acidic character?

HCOOH
CH₃COOH
CH₂CICOOH
CCl₃COOH

Which one of the following electrophile used for nitration of benzene?

Br^⊕
NO₂^⊕
-NH₂
NO^u04e8

Assertion (A) : Phenol is more reactive than toluene toward S_E reaction.
Reason (R): \(\overset { .. }{ \underset { .. }{ O } } H\) group shows +R and +I both effects.

Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
Both A and R are false.

Which of the following compounds will not undergo Friedal-craft's reaction easily?

Xylene
Nitrobenzene
Toluene
Cumene

The stability of alkyl free radicals is due to

Hyperconjugation
+I effect
-I effect
Both a & b

Which of the group has highest +I effect?

CH₃^-
CH₃- CH₂-
(CH₃)₂ - CH-
(CH₃)₃ - C-

Primary alcohols undergo which type of reaction to form alkenes?

Elimination
Oxidation
Reduction
Hydrolysis

The most stable alkene is

CH₂=CH-CH₂-CH₃
\(C{ H }_{ 2 }=\underset { \overset { | }{ C{ H }_{ 3 } } }{ CH } =C{ H }_{ 2 }\)
CH₂=CH-CH=CH₂
CH₃-CH=CH-CH₃

Which one of the following is correct order of the stability of carbanions?

-C(CH₃)₃>^-CH(CH₃)₂> ^-CH₂^-CH₃ > ^-CH₃
^-CH₃>^-CH₂^-CH₃> ^-CH(CH₃)₂> ^-(CH₃)₃
^-CH(CH₃)₂>^-H₃ >^-CH₂^-CH₃ >^-(CH₃)₃
^-CH₂^-CH₃>^-CH(CH³)₂>^-CH₃>^-(CH₃)₃

Decreasing order of nucleophilicity is

OH^- > NH₂^- > ^-OCH₃ > RNH₂
NH₂^- > OH^- > ^-OCH₃ > RNH₂
NH₂^- > CH₃O^- > OH^- > RNH₂
CH₃O^- > NH₂^- > OH^- > RNH₂

Which one of the following species has tendency to show-I effect?

^-CH₃
^-CH₂^-CH₃
^-CH(CH³)₂
^-C₆H₅

CH₃CHO \(\overset { (o) }{ \longrightarrow } \) CH₃COOH. Identify the type of reaction?

Addition reaction
Elimination reaction
Reduction reaction
Oxidation reaction

Which one of the following is positively charged electrophiles?

CO₂
AlCl₃
BF₃
RX

Assertion (A): \(C{ H }_{ 3 }-BH-\overset { + }{ C } { H }_{ 2 }\) cannot show resonance.
Reason (R) : Boron and carbocation both are electron defficient species.

Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
Both A and R are false.

Statement-I: Fluoro acetic acid is stronger acid than acetic acid
Statement-II: Fluorine has high electronegativity and it is facilitate to dissociate the O-H bond easily.

Statement-I and II are correct and statement-II is correct explanation of statement-I.
Statement-I and II are correct but statement-II is not correct explanation of statement-I.
Statement-I is correct but statement-II is wrong
Statement-I is wrong but statement-II is correct

Consider the following compounds,

Hyperconjugation occurs in

(i) and (iii)
(i) only
(ii) only
(iii) only

Pick out the correct order of acid strength

CH₃-CH₂-COOH > CH₃COOH > CH₂ClCOOH
CH₃COOH > CH₃-CH₂-COOH >CH₂CICOOH
CH₂ClCOOH > CH₃COOH > CH₃-CH₂-COOH
CH₂ClCOOH > CH₃-CH₂-COOH > CH₃COOH

Which of the following is correct order of the stability of carbocations?

⁺CH₃>⁺CH₂ CH₃> ⁺CH(CH₃)₂ >⁺C(CH₃)₃
⁺CH₂CH₃>⁺CH₃>⁺CH(CH₃)₂>⁺C(CH₃)₃
⁺C(CH₃)₃>⁺CH(CH₃)₂>⁺CH₂CH₃>⁺CH₃
⁺CH(CH₃)₂>⁺CH₃>⁺CH₂CH₃>⁺C(CH₃)₃

Assertion (A) : addition of HCN in alkene is a type of electrophilic substitution reaction.
Reason (R) : in first step,H₃O⁺ attacks on double bond.

Both A and R are true and R is the correct explanation of A.
Both A. and R are true but R is not the correct explanation of A.
A is true but R is false.
Both A and R are false.

In which of the following homolytic bond fision takes place?

Alkaline hydrolysis of ethyl chloride
Addition of HBr to double bond
Photochlorination of methane
Nitration of benzene

Which of the following has maximum -I effect?

-F
-NO₂
-CN
-OH

Which of the following species does not exert a resonance effect?

C₆H₅OH
C₆H₅Cl
C₆H₅NH₂
\({ C }_{ 6 }{ H }_{ 5 }\overset { + }{ N } { H }_{ 3 }\)

Which one of the following is nucleophile?

BF₃
AICl₃
CO₂
R-SH

Which of the following represents the correct order of stability of the given carbocations?

III > I > II
I > III > II
III > II > I
II > III > I

Which one of the following is an example for free radical initiators?

Benzoyl peroxide
Benzyl alcohol
Benzyl acetate
Benzaldehyde.

Which one of the following has strongest acidic character?

HCOOH
CH₃COOH
CH₂CICOOH
CCl₃COOH

Homolytic fission of covalent bond leads to the formation of

electrophile
nucleophile
Carbo cation
free radical

The number of hyperconjugation structures possible in

3
2
6
None of these

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