Download App

Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons3 Marks
Question
Write structures of all the alkenes which on hydrogenation give 2-methylbutane.
✓

Answer

The basic skeleton of 2-methylbutane is shown below:
$\stackrel{1}{\hbox{C}}-\stackrel{2}{\hbox{C}}-\stackrel{3}{\hbox{C}}-\stackrel{4}{\hbox{C}}\\\ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \text{C}$
On the basis of this structure, various alkenes that will give 2-methylbutane on hydrogenation are:
  1. $\text{H}_3\text{C}-\text{CH}-\text{CH}=\text{CH}_2\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
  2. $\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}=\text{CH}-\text{CH}_3$
  3. $\text{CH}_2=\text{C}-\text{CH}-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$

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

More "3 Marks Question" from Hydrocarbons→Hydrocarbons — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Give the shapes of following covalent molecules using VSEPR theory:
i. $\mathrm{ClF}_3$
ii. $\mathrm{XeF}_4$
iii. $\mathrm{AsF}_5$
→
Describe the hybridization scheme in case of $\mathrm{PCl}_5$. Why are the axial bonds longer as compared to equitorial bonds.
→
The $K_{s p}$ values of two slightly soluble salts $A B$ and $\mathrm{PQ}_2$ are each equal to $4.0 \times 10^{-18}$. Which salt is more soluble?
→
What would be the SI unit for the quantity $\text{pV}^2\text{T}^2/\text{n}$?
→
A 25watt bulb emits monochromatic yellow light of wavelength of 0.57µm. Calculate the rate of emission of quanta per second.
→
An aqueous solution of an inorganic compound 'X' shows the following reactions:
  1. It decolourises an acidified solution of $\text{KMnO}_4$
  2. It liberates $\text{I}_2$ from acidified KI solution.
  3. If removes black stains from red paintings.
Identify 'X' and write all the reactions involved in ionic form,
→
Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 element in more stable oxidation state. Give reason for your choice. State the nature of bonding also.
i. $\mathrm{TICl}_3, \mathrm{TICl}$.
ii. $\mathrm{AlCl}_3, \mathrm{AlCl}_3$.
iii. $\mathrm{InCl}_3, \mathrm{InCl}$.
→
Identify the type of reactions:
  1. $\text{CH}_4+\text{Cl}_2\xrightarrow{\text{sunlight}}\text{CH}_3\text{Cl}+\text{HCl}$
  2. $\text{C}_6\text{H}_6+(\text{conc.})\text{HNO}_36\xrightarrow{\text{conc.}\text{H}_2\text{SO}_4}\text{C}_6\text{H}_5\text{NO}_2+\text{H}_2\text{O}$
  3. $ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Br}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{CH}=\text{CH}_2+\text{HBr}\xrightarrow{\ \ \ \ \ \ \ }\text{CH}_3-\text{CH}-\text{CH}_3$
  4. $\ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \| \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \text{CH}_3-\text{C}-\text{CH}_3+\text{HCN}\xrightarrow{\ \ \ \ \ \ \ \ }\text{CH}_3-\text{C}-\text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CN}$
  5. $\text{CH}_3-\text{CH}=\text{CH}_2\xrightarrow[\text{peroxide}]{\text{HBr}}\text{CH}_3\text{CH}_2\text{CH}_2\text{Br}$
  6. $\text{CH}_3\text{Cl}+\text{KOH}(\text{aq})\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{CH}_3\text{OH}+\text{KCl}$
→
The critical temperature $\left(\mathrm{T}_{\mathrm{d}}\right)$ and critical pressure $\left(\mathrm{P}_{\mathrm{d}}\right)$ of $\mathrm{CO}_2$ are $30.98^{\circ} \mathrm{C}$ and 73 atm respectively. $\mathrm{Can} \mathrm{CO}_2(\mathrm{~g})$ be liquefied at $32^{\circ} \mathrm{C}$ and 80 atm pressure?
→
The heat of combustion of $\mathrm{C}_2 \mathrm{H}_6$ is -368.4 kcal . Calculate heat of combustion of $\mathrm{C}_2 \mathrm{H}_4$, heat of combustion of $\mathrm{H}_2$ is $68.32 \mathrm{kcal} \mathrm{mol}{ }^{-1} . \Delta \mathrm{H}$ for the following reaction is $-37.1 \mathrm{kcal} . \mathrm{C}_2 \mathrm{H}_4(\mathrm{~g})+\mathrm{H}_2(\mathrm{~g}) \longrightarrow \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})$
→