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Why does flammability of alkenes decrease?
the flammability of alkanes decreases as the hydrocarbon chains increase in length their evapouration rates decrease as longer chained molecules have higher boling points so temperatures must be high for them to evaporate therefore there is no fumes or vapours for longer chained alkanes at room temp like nonane and so on these hydrocarbons need higher temp to produce vapours n therefore will not burn with just a match
Why aliphatic compound gives non sooty flame?
Aliphatic compounds, which include alkanes, alkenes, and alkynes, typically have a higher hydrogen-to-carbon ratio compared to aromatic compounds. When burned, they tend to undergo more complete combustion, producing carbon dioxide and water as the main products. This complete combustion results in a clean, non-sooty flame, as there is minimal formation of carbon particulates. In contrast, aromatic compounds often produce soot due to their structure and lower hydrogen content, which leads to incomplete combustion.
Why does branched-alkanes produce less knocking?
Branched alkanes produce less knocking compared to straight-chain alkanes because their molecular structure allows for more efficient combustion within the engine. The branching reduces the likelihood of premature ignition, as branched alkanes have higher octane ratings, meaning they can withstand greater pressure and temperature before igniting. This leads to smoother combustion and less engine knock, enhancing performance and efficiency. Additionally, the irregular shape of branched alkanes disrupts the formation of shock waves that contribute to knocking.
Why are aromatic compounds saturated?
Because, In alkenes&alkynes,there exists atleast One double bond(pi bond) which is relatively weaker than sigma bond(There are no pi bonds in alkanes.Hence they are saturated).Hence they are unsaturated.
Why alkene gives more soot than alkane?
Comparing ethane and ethene . there proportionally more hydrogens in ethane. Conversely there are proportionally more carbons in ethene. Ethane C:H:: 1:3 or 1/3 : 1 Ethene C:H :: 1:2 or 1/2 : 1 Since the fraction '1/2' > 1/3' then more carbon (soot).
Why does flammability of alkenes decrease?
the flammability of alkanes decreases as the hydrocarbon chains increase in length their evapouration rates decrease as longer chained molecules have higher boling points so temperatures must be high for them to evaporate therefore there is no fumes or vapours for longer chained alkanes at room temp like nonane and so on these hydrocarbons need higher temp to produce vapours n therefore will not burn with just a match
What is the similitries between Alkanes Alkenes and Alkynes?
1.The first four (i.e. c1 to c4) members of alkanes are gases,c5 to c17 are all colourless liquids, and higher than c17 are all colourless solids . 2. They are insoluble in water but soluble in organic compounds. 3. They are lighter than water (less dense) and float on it. 4. They are bad conductors of heat and electricity.
Alkenes are unsaturated why?
Alkenes are considered unsaturated because of the presence of a double bond between two or more carbons. A hydrocarbon is only saturated when there are only single bonded carbons present (Alkanes).
What are the product of completely combustion of alkene?
Complete oxidation of alkanes by oxygen yeilds carbon dioxide and water. Alkanes oxidation by O2, (CxH2x+2) + O2 = x CO2 + x+1 H2O. With Halogens it would be CyH2y+2 + X2 = CyX2y+2 + (y+2) HX. Carbon Carbon bonds often do not break in halogen oxidation. "often"
Why aliphatic compound gives non sooty flame?
Aliphatic compounds, which include alkanes, alkenes, and alkynes, typically have a higher hydrogen-to-carbon ratio compared to aromatic compounds. When burned, they tend to undergo more complete combustion, producing carbon dioxide and water as the main products. This complete combustion results in a clean, non-sooty flame, as there is minimal formation of carbon particulates. In contrast, aromatic compounds often produce soot due to their structure and lower hydrogen content, which leads to incomplete combustion.
Which has higher boiling point aldehyde or ketone?
the alkanes are saturated and contains more atoms so therefore contain more electrons this results in stronger dispersion forces the alkenes and unsaturated contain less atoms less electrons weaker dispersion force compared to the alkane
Why are aromatic compounds saturated?
Because, In alkenes&alkynes,there exists atleast One double bond(pi bond) which is relatively weaker than sigma bond(There are no pi bonds in alkanes.Hence they are saturated).Hence they are unsaturated.
Are longer chain alkanes more flammable than shorter chain alkanes?
Shorter chain alkanes are generally more flammable than longer chain alkanes. This is because shorter chain alkanes are more volatile and readily vaporize, making them easier to ignite. Longer chain alkanes are less volatile and require higher temperatures to vaporize and ignite.
Describe and illustrate the role of the various components which make up a petroleum?
Petroleum is a mixture of hydrocarbons that consists of various components such as alkanes, cycloalkanes, alkenes, and aromatic hydrocarbons. Each component has different physical and chemical properties, which determine its behavior during refining and processing. For example, alkanes are saturated hydrocarbons that are more stable and have higher boiling points compared to alkenes, which are unsaturated hydrocarbons. Aromatic hydrocarbons contain a benzene ring structure and are often used as additives in gasoline to enhance octane ratings. Together, these components form the complex mixture known as petroleum.
Are all alkenes gases?
No, not all alkenes are gases. Alkenes can exist as gases, liquids, or solids depending on their molecular structure and size. For example, ethene (C2H4) is a gas at room temperature, while higher alkenes like octene (C8H16) are liquids.
Why alkene gives more soot than alkane?
Comparing ethane and ethene . there proportionally more hydrogens in ethane. Conversely there are proportionally more carbons in ethene. Ethane C:H:: 1:3 or 1/3 : 1 Ethene C:H :: 1:2 or 1/2 : 1 Since the fraction '1/2' > 1/3' then more carbon (soot).
Why higher density air is better for combustion?
The higher the air density, the more oxygen available for combustion.
