Haloalkanes and halo arenes practice · Medium

Assertion (A): Chlorine is an ortho-para directing group in electrophilic aromatic substitution reaction.

Reason (R): Chlorine is an electron withdrawing group.

Assertion: Benzyl chloride undergoes nucleophilic substitution through $\mathrm{SN}_1$ mechanism.

Reason: Benzyl carbocation is resonance stabilized.

${{{C}}_6}{{{H}}_5}{{C}} \equiv {{N}} + 2({{H}})\xrightarrow[{{H_2}o}]{{SnC{l_2}/HCl}}{{{C}}_6}{{{H}}_5}{{CHO}} + {{N}}{{{H}}_3}$ the above reaction is

Arrange the following alcohols in increasing order of their reactivity towards the reaction with ${HCl}$.

$\left({CH}_3\right)_2 {CH}-{OH}(1),\left({CH}_3\right)_3 {C}-{OH}(2),\left({C}_6 {H}_5\right)_3 {C}-{OH} \text { (3) }$

Decreasing order of nucleophilicity of the given species in ethanol is ${PhO}^{-}, {I}^{-}, {EtO}^{-}, {PhS}^{-}$

The organic compound used as feedstock in the synthesis of chlorofluorocarbons is

Alkyl fluorides are synthesised by alkyl chloride/bromide in presence of ____ or ____

i) $Ca{F_2}$ ii) $Co{F_2}$ iii) $H{g_2}{F_2}$ iv) NaF

In mid 1960 , it is used as cleaning fluid, degreasing agent, spot remover, fire extinguisher. Which of the solvent is used in mid 1960 ?

Which group is displaced by a halogen group?

Chlorination of $C{S_2}$ gives:

Wurtz reaction of methyl iodide yields an organic compound $\mathrm{X}$. Which of the following reaction also yields $\mathrm{X}$:

Aryl halides are less reactive towards electrophiles than alkyl halides due to:

$p\pi-d \pi$ bonding is not exhibited by

Out of following in which retention of configuration in product $?$ will take
place?

Ethylene dichloride and ethylidene chloride are isomeric compounds. Identify the statement which is not applicable to both of them?

Which process does not occur during formation of $\mathrm{CHC}{\mathrm{l}_3}\mathrm{\;from\;\;}{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH\;and\;bleaching}\;$ powder?

Although chlorobenzene does not give Ulmann’s reaction. However, presence of…group in chlorobenzene at $o - ,p -$position enables it to give Ulmann’s reaction.

Which of these liquids would be unsuitable as an inert solvent for a Friedel-Crafts reaction?

Assertion : Chlorination of allylic hydrogen is difficult than vinylic hydrogen.

Reason : Allyl radical is stabilized by resonance.

$CH _3 CH _2- CH = CH _2 \xrightarrow{\text { NBS }} \underset{\text { One of the product }}{( X )} \xrightarrow{\text { alc. } KOH }( Y )$ The compound $( Y )$ is

Read the following statements
A. Gabriel phthalimide synthesis is used to prepare all ${1^0}$ amines
B. ${C_6}{H_5}Cl{C_6}{H_5} - {C_6}{H_5}$ is known as Wurtz reaction.
C. In $S{N^1}$ mechanism there is more inversion than retention leading to partial racemization
D. All aldehydes give red precipitate with Fehling’s solution
E. Reactivity order of alkyl halides towards $S{N^2}$ reaction is ${1^0} > {2^0} > {3^0}$
Number of correct statements among these

What is the common name of the given compound?
$C{{H}_{3}}-\underset{\begin{matrix} | \\ Cl \\ \end{matrix}}{\mathop{CH}}\,-Cl$

Ethyl alcohol gives ethyl chloride on treatment with:

Compare the rate of $\mathrm{S}{\mathrm{N}^2}$ reaction
$\begin{array}{cccccccccccccccccccc} {C{H_3} - \mathop C\limits^{\begin{array}{cccccccccccccccccccc} O \\ {||} \end{array}} - C{H_2} - Br}&{C{H_3} - Br}&{C{H_3} - \mathop C\limits^{\begin{array}{cccccccccccccccccccc} O \\ {||} \end{array}} - C{H_2} - Cl}&{C{H_3} - Cl} \\ {(1)}&{(2)}&{(3)}&{(4)} \end{array}$

In the reaction sequence,

${\mathrm{C}_2}{\mathrm{H}_5}\mathrm{Cl\;} + \mathrm{\;KCN}\xrightarrow{{{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH\;}}}\;X\xrightarrow[\Delta ]{{{\mathrm{C}_2}{\mathrm{H}_5}\mathrm{OH\;}}}Y$

What is the molecular formula of Y?

The major product of the following reaction is:
$C{H_3} - \mathop {CH}\limits^{\begin{array}{cccccccccccccccccccc} {Cl} \\ | \end{array}} - C{H_3}\xrightarrow[{\begin{array}{cccccccccccccccccccc} {(ii){\text{ }}HBr,{\text{ peroxide}}} \\ {\left( {iii} \right){\kern 1pt} {\kern 1pt} {\text{aq}}.{\kern 1pt} {\kern 1pt} KOH} \end{array}}]{{{\text{ }}(i){\text{ Alc}}.{\text{ }}KOH}}$

Predict the order of reactivity of the following four isomers towards ${S}{{N}}^2$ reaction.
(I) ${CH}_3 {CH}_2 {CH}_2 {CH}_2 {Cl}$
(II) ${CH}_3 {CH}_2 {CH}({Cl}) {CH}_3$
(III) $\left({CH}_3\right)_2 {CHCH}_2 {Cl}$
(IV) $\left({CH}_3\right)_3 {CCl}$

Which of the following statements is correct?

Which one is the least reactive towards $\mathrm{SN}^1$ reaction?

Which can be hydrolysed most easily?