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11th Chemistry Weekly Test - 1 ( Basic concept of organic reactions )

MABS Institution

11th Chemistry Weekly Test - 1 ( Basic concept of organic reactions )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The most stable carbocation is

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

: CH₂ is an

Electrophile
Nucleophile
Free Radical
Ambiphiles

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

^-CH₃
^-CH₂^-CH₃
^-CH(CH³)₂
^-C₆H₅

Assertion (A): \({ C }_{ 2 }{ H }_{ 3 }-\overset { + }{ C } H-{ C }_{ 2 }{ H }_{ 5 }\) is more stable than \(C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 3 }\)
Reason (R): Positive inductive effective of C₂H₅^- group is less than CH₃^- group.

Both A and Rare tnie 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: Homolytic cleavage is symmetrical one.
Statement-II: A single covalent bond breaks and each of the bonded atoms retains one electron.

Statement-I and II are correct and statement-II is correct explanation of statement-I.
Statement-land II are correct but statement-I! 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.

Carbon-carbon bond order is benzene is 1.5 due to

Inductive effect
Electromeric effect
Resonance
H-bonding

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

The number of hyperconjugation structures possible in

3
2
6
None of these

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

Benzoyl peroxide
Benzyl alcohol
Benzyl acetate
Benzaldehyde.

Part - B

Generic 2 - Answer All Question

Write a short notes on negative mesomeric effect?

Complete the reaction and name the product

Identify the product and mention the type of organic reaction.\({ CH }_{ 3 }-\overset { \underset { | }{ Br } }{ CH } -{ CH }_{ 3 }\overset { { C }_{ 2 }{ H }_{ 5 }OH }{ \underset { { C }_{ 2 }{ H }_{ 2 }ONa }{ \longrightarrow } } ?\)

How does the addition reaction affect the hybridisation of the substrale? Give example.
Explain electromeric effect.

Part - C

Generic 3 - Answer All Question

Write structures of various carbocations that can be obtained from 2-methyl butane. Arrange these carbocations in order of increasing stability.

The structure of triphenylmethyl cation is given below. This very stable and some of its salts can be stored for months. Explain the cause of high stability of this cation.

While writing the resonance structures, what are the rules to be followed?

Which of the following compounds will not exist as resonance hybrid? Give reason for your answer.
(i) CH₃ - OH
(ii) R-CONH₂
(iii) CH₃-CH = CH-CH₂NH₂
Explain the substitution reaction in detail with suitable examples.

Part - D

Generic 5 - Answer All Question

How does hyper conjugation effect explain the stability of alkenes?

Explain electron movement in organic reactions.
Complete the reactions and identify the products.
(i)

(ii)
\({ CH }_{ 3 }-\underset { \overset { | }{ Cl } }{ C } H-{ CH }_{ 3 }\overset { { H }^{ + }/{ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 } }{ \longrightarrow } A\overset { (O)) }{ \longrightarrow } B\)

Write the complete chemical equation for the following.
(i) Hydrolysis of alkyl halide
(ii) Nitration of benzene
(iii) Reduction of benzene
(iv) Bromination of alkene
(v) Oxidation of 4-hydroxy phenol

Explain the types of addition reactions?

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