Table of Contents
What increases in an alkane?
The boiling points of alkanes increase with increasing number of carbons. For a given number of carbon atoms, an unbranched alkane has a higher boiling point than any of its branched-chain isomers.
How does the density of alkanes vary with increase in the number of carbon atoms?
Van der Waals force of attraction between the molecules increases with an increase in no. of carbon atoms. Thus, the molecules occupy less volume in comparison to increased mass. Hence, the density of alkanes increases on increasing the no.
Which reaction increases carbon chain?
In order to enable carbon chain increase reactions by aldol condensation with HMF or furfural, an additional compound possessing α-hydrogen must be introduced. Cross-aldol condensation of HMF or furfural with acetone has been studied more thoroughly.
Which of the following reaction gives higher alkanes containing double the number of carbon?
Wurtz reaction
Wurtz reaction is limited for the synthesis of symmetrical alkanes (i.e., alkanes with an even number of carbon atoms). In this reaction, two similar alkyl halides are taken as reactants and an alkane, containing double the number of carbon atoms, are formed.
Why alkanes get thicker and less runny as the length of the carbon chain increases?
As the carbon chain increases in length, there are more intermolecular forces holding molecules together. This means that the substance will become denser as the carbon chain increases.
How does boiling point change with carbon number for a range of straight chain alkanes?
For example, as the chain length increases, their boiling point increases. The general formula means that the number of hydrogen atoms in an alkane is double the number of carbon atoms, plus two. For example, methane is CH 4 and ethane is C 2H 6.
Which reaction is used to increase the length of carbon chain?
To explain: Wurtz reaction is used to increase the length of the carbon chain, Kolbe’s electrolysis is used when alkanes require even number of carbon atoms while clemmensen reduction and wolff-kishner are used for removing water molecule.