Download App

STD 12 - 7. Alcohol, phenol and ethers — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 7. Alcohol, phenol and ethers4 Marks
MCQ
When alcohol reacts with concentrated ${H_2}S{O_4}$ intermediate compound formed is
  • ✓
    Carbonium ion
  • B
    Alkoxy ion
  • C
    Alkyl hydrogen sulphate
  • D
    None of these
✓

Answer

Correct option: A.
Carbonium ion
a
(a) In all cases intermediate is carbonium ion, and there may be $1, 2-$ hydride or $1, 2-$ methyl shift to form more stable carbonium ion.

$ - \mathop C\limits_{\mathop |\limits_H }^| \,\,\,\,\, - \mathop C\limits_{\mathop |\limits_{\,\,\,\,OH} }^|  - \overset {{H^ + }} \longleftrightarrow  - \mathop C\limits_{\mathop |\limits_{\mathop H\limits_{{\text{Protonated}}\,\,\,{\text{alcohol}}} } }^|  - \mathop C\limits_{\mathop |\limits_{{}^ + O{H_2}} }^|  - \overset {{H_2}O} \longleftrightarrow $

${\mathop { - \mathop C\limits_{\mathop |\limits_H }^|  - \mathop C\limits_|^|  - }\limits_{Carbonium\,\,ion} } \overset { - {H^ + }} \longleftrightarrow  - \mathop C\limits^|  = \mathop C\limits^|  - $

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

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

Similar questions

In the given pair of reaction in which pair the second reaction is more reactive  than first toward $S_{N^2}$ reaction ?
→
The order of ionisation potential between $He^+$ ion and $H-$ atom (both species are in  gaseous state) is
→
The osmotic pressure of solution increases, if
→
Maximum oxidation state central atom is present in
→
$\begin{array}{*{20}{c}}
  {C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ 
  {C{H_3} - C = C{H_2} + {{(C{H_3})}_2}CHC{H_3}\xrightarrow[{273\,K}]{{HF}}{C_8}{H_{18}}(A)} 
\end{array}$ Unknown $(A)$ in the above reaction is
→
The law of photochemical equivalence was given by
→
The correct description of the product in the above reaction is

$\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}OC{H_3}} \\ 
  | \\ 
  {\mathop {C{H_3}CHBr}\limits_{(R)} } 
\end{array}$ $\xrightarrow[{acetone}]{{NaCN}}$ $\begin{array}{*{20}{c}}
  {\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{H_2}OC{H_3}} \\ 
  | \\ 
  {\mathop {C{H_3}CHCN}\limits } 
\end{array}$

→
On heating glycerol with conc. ${H_2}S{O_4},$ a compound is obtained which has a bad odour. The compound is
→
Wood spirit is known as
→
In $C{H_3}C{H_2}OH$ which bond dissociates heterolytically
→