Table of Contents
What are the properties of nitro compounds?
Physical Properties of Nitro Compounds
- Physical state, color, odour: Nitroalkanes are colorless, pleasant smelling liquids.
- Boiling point: Both nitroalkanes and nitroarenes are highly polar compounds and thus have strong dipole-dipole interactions.
What are nitro dyes also known as?
Azo dyes are organic compounds bearing the functional group R−N=N−R′, in which R and R′ are usually aryl. They are a commercially important family of azo compounds, i.e. compounds containing the linkage C-N=N-C. Azo dyes are widely used to treat textiles, leather articles, and some foods.
What are the examples of nitro dyes?
Nitoroso dyes, and similar nitro dyes, were first developed in 1864. Examples are, Martins yellow, Palatine orange and nitroso green (CI Pigment Green 8). Nitroso dyes can form azo complexes with iron.
What is the nitro functional group?
The nitro group is one of the most common explosophores (functional group that makes a compound explosive) used globally. The nitro group is also strongly electron-withdrawing. Nitro groups are rarely found in nature. They are almost invariably produced by nitration reactions starting with nitric acid.
Why are nitro compounds usually yellow in color?
UV The nitrogen from aromatic ring causes a pronounced shift of lmax to longer wavelengths when conjugated to unsaturated p systems, a bathochromic shift. This is why aromatic nitro compounds are often yellow.
What are nitro hydrocarbons?
Nitro compounds are considered to be derivatives of hydrocarbons in which one or more hydrogen atoms are substituted by nitro group. They are further classified as aliphatic or aromatic nitro compounds, depending upon whether the nitro group is bonded to an alkyl or aryl group.
What are the features of a good dye?
A good dye has the following qualities:
- It has a suitable color.
- It fixes itself to fabrics.
- It has fastness properties, such as: Fastness to light. Resistance to the action of water, diluted acids, alkalis, and various organic solvents used in dry cleaning.
What are the characteristics of dyes?
A dye has the following characteristics:
- It must have a suitable colour.
- It can be fixed on the fabric either directly or with the help of mordant.
- It must be resistant to the action of water, acid and alkalies. The groups responsible for colour are called chromophores.
- These should be unaffected by light.
How Polar is a nitro group?
nitro compound, any of a family of chemical compounds in which the nitro group (―O―N=O) forms part of the molecular structure. Nitro compounds are polar, and those with no other chemically reactive grouping are colourless or pale yellow liquids that are only slightly soluble in water.
What is the formula of Nitro?
Nitromethane
| Names | |
|---|---|
| Chemical formula | CH3NO2 |
| Molar mass | 61.04 g/mol |
| Appearance | colorless, oily liquid |
| Odor | Light, fruity |
What’s a Nitro?
nitro. noun. plural nitros. Definition of nitro (Entry 2 of 2) : any of various nitrated products specifically : nitroglycerin.
What’s a nitro?
Why are nitro groups good for disperse dyes?
In this regard, nitro groups are especially beneficial, contributing to their prevalence in disperse dye structures. Increasing the number of electron-attracting groups conjugated with the electron-donor has a bathochromic effect.
Which is the best description of a natural dye?
Natural Dye • Natural dyes are dyes or colorants derived from plants, invertebrates, or minerals. • The majority of natural dyes are vegetable dyes from plant sources.
How many inkages are there in mono azo dyes?
Azo bond linkage ( – N = N –) may be present more than once, mono azo dyes have one azo l inkage. While, there are two linkages in diazo dyes and three in triazodyes respectively. synthetic dyes. Approximately 70% of all the dyes used in industry are azo dyes. They are widely used
Which is the best description of azo dyes?
10. Azo Dyes • Azo dye is a large class of synthetic organic dyes that contain nitrogen as the azo group −N=N− as primary chromophore their molecular structures. More than half the commercial dyes belong to this class. These dyes are highly coloured and are prepared by diazotizing an aromatic amine and coupling with suitable aromatic compound.