RRB Group-D Model Paper 15 with answers for online practice

Question : 33 of 100

Marks: +1, -0

The molecular formula of Propane is ________.

Solution:

The molecular formula of propane is $C_3H_8$ .
Alkanes are acyclic hydrocarbons in which carbon-carbon atoms have a single bond between them, i.e. they are saturated hydrocarbons.
The general formula for alkanes is $C_nH_{2n+2}$ , where 'n' is the number of carbon atoms.
Propane is the third member of the alkane family with 3 carbon atom. If we put the number of carbon and hydrogen atoms present in propane in the above-mentioned formula, we will find that it holds true.
$CH_4$ is Methane, the first member of the alkane family.
$C_4H_10$ is Butane, the fourth in the line of alkanes.
$C_2H_6$ is Ethane, the second member of the alkane family.
The lower alkanes from $C_1 to C_4$ are gases, from $C_5 to C_16$ are liquids and beyond that are solids.

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