Download App

STD 12 - 6. Haloalkanes and Haloarenes — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 6. Haloalkanes and Haloarenes4 Marks
MCQ
Which of the following statements is wrong?
  • A
    Ethyl chloride on reduction with $Zn-Cu$ couple and alcohol gives ethane.
  • ✓
    The reaction of methyl magnesium bromide with acetone gives butanol $-2$
  • C
    Alkyl halides follow the following reactivity sequence on reaction with alkenes.
    $R - I > R - Br > R - Cl > R - I$
  • D
    $C_2H_4Cl_2$ may exist in two isomeric forms
✓

Answer

Correct option: B.
The reaction of methyl magnesium bromide with acetone gives butanol $-2$
b
$\begin{matrix}
   C{{H}_{3}}  \\
   C{{H}_{3}}  \\
\end{matrix}>\,C\,=\,O\,+\,C{{H}_{3}}C{{H}_{2}}MgBr\,\to $  $\begin{matrix}
   C{{H}_{3}}  \\
   C{{H}_{3}}  \\
\end{matrix}>\,C\,<\,\begin{matrix}
   OMgBr  \\
   C{{H}_{2}}C{{H}_{3}}  \\
\end{matrix}\,\xrightarrow{{{H}_{2}}O}$  $\underset{\begin{smallmatrix} 
 2\,\,methyl\,\,bu\tan ol\,\,-\,2 \\ 
 \,\,\,\,\,\,\,({{3}^{o}}\,\,alcohol) 
\end{smallmatrix}}{\mathop{\begin{matrix}
   C{{H}_{3}}  \\
   C{{H}_{3}}  \\
\end{matrix}>\,C\,<\,\begin{matrix}
   OH  \\
   C{{H}_{2}}C{{H}_{3}}  \\
\end{matrix}}}\,$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

JEE STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Manganese steel is used for making railway tracks because
→
Which of the following pairs of species has same electronic configuration
→
The hydroxides of $II^{nd}$ $A$ metal at $25\,^oC$ ,lowest value of solubility product $(Ksp)$ ?
→
In which $O-O$ bond distance is minimum
→
Compare the stabilities of the following two compounds :
$A$ : cis- $1$ -Ethyl- $3$ -methylcyclohexane
$B$ : trans- $1$ -Ethyl- $3$ -methylcyclohexane
→
For the energy level with the principal quantum number $3,$ the number of possible orbitals is
→
Number of compounds/species from the following with non-zero dipole moment is. . . . . .  $\mathrm{BeCl}_2, \mathrm{BCl}_3, \mathrm{NF}_3, \mathrm{XeF}_4, \mathrm{CCl}_4, \mathrm{H}_2 \mathrm{O} \mathrm{H}_2 \mathrm{~S}, \mathrm{HBr}$, $\mathrm{CO}_2, \mathrm{H}_2, \mathrm{HCl}$
→
What is the equilibrium expression for the reaction ${P_{4(s)}} + 5{O_{2(g)}}$ $\rightleftharpoons$ ${P_4}{O_{10(s)}}$
→
A hydrocarbon of formula ${C_6}{H_{10}}$ absorbs only one molecule of ${H_2}$ upon catalytic hydrogenation. Upon ozonolysis, the hydrocarbon yields $\begin{array}{*{20}{c}}
  {\,H\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,H} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,|} \\ 
  {O = C - C{H_2} - C{H_2} - C{H_2} - C{H_2} - C = O} 
\end{array}$ The hydrocarbon is
→
At a given temperature, the equilibrium constant for reaction $PC{l_5}_{(g)}$ $\rightleftharpoons$ $PC{l_3}_{(g)} + C{l_2}_{(g)}$ is $2.4 \times {10^{ - 3}}$. At the same temperature, the equilibrium constant for reaction $PC{l_3}_{(g)} + C{l_2}_{(g)}$ $\rightleftharpoons$ $PC{l_5}_{(g)}$ is
→