Haloalkanes and Haloarenes Test 6

Result

Haloalkanes and Haloarenes Test 6

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Weekly Quiz Competition

Question 1
1 / -0

Only One Option Correct Type
Direction (Q. Nos. 1-8) This section contains 8 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
Cyanide anion has two atoms th at have lone pair of electrons. Either could act as nucleophile in the reaction. Yet in the vast majority of the cases, carbon acts as nucleophile and forms a bond to the substrate, why?

A
Nitrogen is strongly solvated in hydroxylic solvents, it will be less reactive

B
Carbon is more reactive in polar aprotic solvents, normally used for these S_N2 reactions

C
Carbon atoms are more basic than nitrogen

D
The lone pair of electrons on C is in sp hybrid orbital

Solution

Both carbon and nitrogen are capable of donating electron pair but carbon is better electron donor than nitrogen, carbon donates electron pair in most of the cases.
Question 2
1 / -0

In the following two phase reaction, catalyst works by
C₆H₅CH₂Br + KCN C₆H₅CH₂CN + KBr

A
transforming CN^- from the aqueous phase to organic containing C₆H₅CH₂Br

B
transforming C₈H₅CH₂Br from organic phase to the aqueous phase containing CN^-

C
removing Br^- from the organic base to aqueous phase

D
removing K⁺ from the organic phase to make CN^- more nucleophilic

Solution

By the following equilibrium

Cyanide ion is transferred to organic phase otherwise KCN is insoluble in organic solvents.
Question 3
1 / -0

Which of the following would react most rapidly with sodium ethoxide to produce an ether?

A
Chlorobenzene

B
2-nitrotoluene

C
p-nitrochlorobenzene

D
m-(chloromethyl)-toluene

Solution

In all other cases leaving group is on phenyl ring, not substituted, usually by nucleophiles under ordinary condition.
Question 4
1 / -0

In the given reaction,
X will be

A

B

C
1 :1 mixture of (a) and (b)

D
2 : 1 mixture of (a) and (b)

Solution
Question 5
1 / -0

In the given reaction,
X will be

A

B

C

D

Solution
Question 6
1 / -0

Consider the following reaction,
Q.
What can be correctly predicted regarding this reaction?

A
S_N1 reaction is occurring

B
S_N2 reaction is occurring

C
Neighbouring group participation and S_N2 reaction are occurring

D
Neighbouring group participation and S_N1 reaction are occurring

Solution
Question 7
1 / -0

Pick out the alkyl bromide which proceeds with retention of configuration in an S_N2 reaction with CH₃ONa (aq).

A

B

C

D

Solution

Due to inversion of configuration twice at α-carbon, there will be overall retention of configuration.
Question 8
1 / -0

For the following reaction, pick out the best term which describe its mechanism

A
S_N1

B
S_N2

C
S_N2 with neighbouring group participation

D
addition followed by substitution

Solution