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11th Chemistry Monthly Test - 2 ( Basic concept of organic reactions )

MABS Institution

11th Chemistry Monthly Test - 2 ( Basic concept of organic reactions )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

What is the hybridisation state of benzyl carbonium ion?

sp²
spd²
sp³
sp²d

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

Xylene
Nitrobenzene
Toluene
Cumene

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.

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 is not electrophile?

NH₃
AlCl₃
FeCl₃
R-X

Which of the following carbocation will be most stable?

Ph₃C_-⁺
\({ C }{ H }_{ 3 }-\overset { + }{ C } { H }_{ 2 }\)
\(\left( { CH }_{ 3 } \right) _{ 2 }-\overset { + }{ C } { H }\)
\(CH_{ 2 }=CH-\overset { + }{ C } { { H }_{ 2 } }\)

Which of the following has maximum -I effect?

-F
-NO₂
-CN
-OH

The most stable carbanion is

CH₃-CH₂
CH₂=CH
CH₂≡ C
(CH₃)₂-CH

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

Assertion (A) : Brcl +I can form to 6 different geometrical isomers.
Reason (R) : Each one structure is geometrical isomere of other five structures.

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.

Part - B

Generic 2 - Answer All Question

Write a short notes on negative mesomeric effect?

What are addition reactions? Give an example.

Write a short note on oxidation and reduction reactions.

How does inductive effect plays a vital role in determining the strength of acids and bases.
Which electron displacement effect explain the following correct orders of acidity of the carboxylic acids?
CH₃CH₂COOH> (CH₃)₂ CHCOOH > (CH₃)₃C COOH
As the number of alkyl group increases, +1 effect increases and it strengthen the O-H bond. i.e., O-H bond dissociation is very difficult.

How will substitution reactions die classified?

What are organic reduction reactions? Give an example

Part - C

Generic 3 - Answer All Question

Which bond is more polar in the following pair of molecular?
(i) H₃C-H (or) H₃C-Br
(ii) H₃C-NH₂ (or) H₃C-OH
(iii) H₃C-OH (or) H₃C-SH

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.

What are the possible types of electron movement? Represent them by clearly indicating the electron shift.

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?

Carry over the following reaction mechanisms.
(i) Bromination of alkene
(ii) Addition of HCN to CH₃CHO
(iii) Formation of alkyl bromide with benzoyl peroxide as radical initiator.

Part - D

Generic 5 - Answer All Question

An organic compound (A) has a molecular formula C₂H₆0 it is one of the primary alcohol. A reacts with acidified potassium dichromate to give B. B on further undergoes to oxidation reaction to give C. C on reacts with SOCl₂ to give D which is chlorinated product. Identify A,B,C and D, explain with equation.

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 electron movement in organic reactions.

How does inductive effect influence the reactivity and acidity of carboxylic acids?

Complete the reactions and identify the products.
(i)

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

Explain the types of substitution reaction?

For the following bond cleavages use curved-arrows to show the electron flow and classify each as homolytic or heterolytic fission. Identify reactive intermediate produced as free radical, carbocation and carbanion?
(a) \({ CH }_{ 3 }O-O{ CH }_{ 3 }\longrightarrow { CH }_{ 3 }\overset { \bullet }{ O } +{ CH }_{ 3 }\overset { \bullet }{ O } \)
(b)

(c)

(d)

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