Download App

Model Paper 7 — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 72 Marks
Question
Write a short note on hydrogenation of unsaturated aliphatic hydrocarbons.
✓

Answer

When unsaturated compounds, i.e. alkenes or alkynes, are treated with dihydrogen in the presence of finely divided catalysts (i.e. Pt , Pd or Ni ), alkanes are obtained and the reaction is called hydrogenation reaction. As represented in the following reaction where ethene is converted into ethane.
$
\underset{\text { Ethene }}{eg CH_2}=CH_2+H_2 \xrightarrow{Pt \backslash Pd \backslash Ni} \underset{\text { Ethane }}{CH_3-} 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 "2 Marks Questions" from Model Paper 7→Model Paper 7 — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

What are pesticides and herbicides? Explain giving examples.
→
The behaviour of matter in different states is governed by various physical laws. According to you what are the factors that determine the state of matter?
→
Nitric acid acts only as an oxidising agent while nitrous acid acts both as an oxidising as well as reducing agent. Explain.
→
Why does formic acid exist as dimer? What is its one consequence?
→
IF SHE (Standard Hydrogen Electrode) acts as anode and given metal acts as cathode, what is the sign of the reduction potential of metal?
→
The reactivity of halogens decreases down the group but of alkali metal increases down the group, why?
→
Name the isotope of hydrogen which contains equal number of protons and neutrons.
→
How would you explain the following observations?
BaO is soluble but $\mathrm{BaSO}_4$ is insoluble in water.
→
Calculate the wavelength, frequency and wavenumber of a light wave whose period is $2.0 \times 10^{-10} \mathrm{~s}$.
→
$2\text{Cu}_2\text{S}+3\text{O}_2\xrightarrow{ \ \ \ \ \ \ \ \ }2\text{Cu}_2\text{O}+2\text{SO}_2$ In this reaction which substance is getting oxidised and which substance is getting reduced. Name reducing agent and oxidising agent.
→