NEET

In the following sequence of reactions \(CH_{3}-Br\overset{KCN}{\rightarrow} A \overset{H_{3}O^{+}}{\rightarrow}B\begin{matrix}ether \\\rightarrow \\ LiAH_{4}\end{matrix}C\) the end product (C) is :

acetone
methane
acetaldehyde
ethyl alcohol

Solution

Which one is most reactive towards NS₁ reaction ?

C₆H₅CH(C₆H₅)Br
C₆H₅CH(CH₃)Br
C₆H₅C(CH₃)(C₆H₅)Br
C₆H₅CH₂

Solution

SN₁ reactions involve the formation of carbocations,order of stability of carbocationis 3° > 2° > 1° hence higher the stability of carbocation, more will be the reactivity of the parent alkyl halide. Moreover the tertiary carbocation formed from (c) is stabilized by two phenyl groups.

Trichloroacetaldehyde, CCl₃CHO reacts with chlorobenzene in presence of sulphuric acid and produces :

Solution

Benzene reacts with CH3Cl in the presence of anhydrous AlCl₃ to form:

chlorobenzene
benzylchloride
xylene
toluene

Solution

Which of the following reactions is an example of nucleophilic substitution reaction?

2 RX + 2 Na → R – R+ 2 NaX
RX + H2 → RH + HX
RX + Mg → RMgX
RX + KOH → ROH + KX

Solution

It is a nucleophilic substitution reaction as here stronger nucleophile OH^– is replacing weaker nucleophile X–

In a S_N2 substitution reaction of the type

\(R-Br+Cl^{-}\overset{DMF}{\rightarrow}R-Cl+Br^{-}\)

which one of the following has the highest relative rate ?

CH₃– CH₂– CH₂Br
CH₃CH₂Br

Solution

When chlorobenzene is reacted with acetyl chloride in the presence of anhydrous AlCl₃, the major product formed is

2-chloroacetophenone
3-chloroacetophenone
4-chloroacetophenone
1, 4-dichlorobenzene

Solution

Ethyl alcohol is used as a preservative for chloroform because it:

prevents aerial oxidation of chloroform
prevents decomposition of chloroform
decomposes phosgene to CO and Cl₂
removes phosgene by converting it to ethyl carbonate

Solution

The product formed by heating iodoform with KOH is :

HCHO
HCOOK
CH₃COOK
CH₃CHO

Solution

Reaction of chloroform with KOH in presence of a primary aromatic amine is called :

carbylamine reaction
reduction
hydrolysis
Wurtz reaction

Solution

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