Download App

Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons3 Marks
Question
$\text{Pent-1-yne}\xrightarrow[(\text{ii})\ \text{CH}_3-\text{I}]{(\text{i})\ \text{NaNH}_2/\text{NH}_3}\text{A}\xrightarrow[\text{Lindlar's catalyst}]{\text{H}_2}\text{B}\xrightarrow{\text{Br}_2}\text{‘C’}$Identify A, B and C compounds and give their reactions.
✓

Answer

$\text{HC}\equiv\text{C}-\text{CH}_2-\text{CH}_3\xrightarrow[(\text{i})\ \text{CH}_3-\text{I}]{(\text{i})\ \text{NaNH}_2/\text{NH}_3}\\\text{CH}_3-\text{C}\equiv\text{C}-\text{CH}_2-\text{CH}_2-\text{CH}_3\xrightarrow[\text{H}_2]{\text{Lindlar's catalyst}}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{‘A’}$
$\text{CH}_3-\text{CH}=\text{CH}-\text{CH}_2-\text{CH}_2-\text{CH}_3\xrightarrow{\text{Br}_2}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{‘B’}\\\text{CH}_3-\text{CH}-\text{CH}-\text{CH}_2-\text{CH}_2-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Br}\ \ \ \ \ \ \text{Br}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{‘C’}$

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

What is the number of photons of light with a wavelength of $4000$ pm that provide $1J$ of energy?
→
Calculate critical temperature, critical pressure and critical volume of a gas whose van der Waal's constants are a = $0.750 \mathrm{~atm} \mathrm{~L}^2 \mathrm{~mol}^{-2}, \mathrm{~b}=0.0226 \mathrm{~L} \mathrm{~mol}^{-1}$
→
pH of $0.08 \mathrm{mol} \mathrm{~dm}^{-3} \mathrm{HOCl}$ solution is 2.85 . Calculate its ionisation constant.
→
Suggest a method to purify:
  1. Camphor containing traces of common salt.
  2. Kerosene oil containing water.
  3. A liquid which decomposes at its boiling point.
→
Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.
→
a. Consider the isoelectronic species, $\mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{F}^{-}$and $\mathrm{O}^{2-}$. What is the correct order of increasing length of their radii and why?
b. Si is semiconductor whereas ' C ' is non-metal, why?
→
  1. How many gram atoms are there in $8.0g$ of S?
  2. The molarity of Solution of sulphuric acid is $1.35M$. Calculate its molality.
(The density of solution is $1.02g cm^{-3})$
→
For the following bond cleavages, use curved-arrows to show the electron flow and classify each as homolysis or heterolysis. Identify reactive intermediate produced as free radical, carbocation and carbanion.
→
How does $\mathrm{H}_2 \mathrm{O}_2$ behave as a bleaching agent?
→
When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of $1.68 \times 10^5 \mathrm{~J} \mathrm{~mol}^{-1}$. What is the minimum energy needed to remove an electron from sodium? What is the maximum wavelength that will cause a photo-electron to be emitted?
$\left(\mathrm{h}=6.626 \times 10^{-34} \mathrm{~J} \mathrm{~s}\right)$
→