Question

How many covalent bonds are present in propane with molecular formula c3h8 an butane with molecular formula c4h8

Answer 1

in propane
H H H
H-C-C-C-H
H H H there are 10 covalent bonds
in butane there will be 2 ore than propane
=>12 covalent bonds

Answer 2

Answer : The number of covalent bonds present in propane and butane are, 10 and 13 respectively.

Explanation :

The molecular formula of propane is, $C_3H_8$ and butane, $C_4H_{10}$

From the expanded structural formula the propane and butane, we conclude that the number of covalent bonds present in propane and butane are,

As there are 2 carbon-carbon covalent bonds and 8 carbon-hydrogen covalent bonds present in the propane molecule. So, the total number of covalent bonds present in the propane are, (2 + 8 = 10)

As there are 3 carbon-carbon covalent bonds and 10 carbon-hydrogen covalent bonds present in the butane molecule. So, the total number of covalent bonds present in the butane are, (3 + 10 = 13)

Therefore, the number of covalent bonds present in propane and butane are, 10 and 13 respectively.