What is the molecular formula of heptane and ethane respectively?

C_{7} H_{16}, C_{2} H_{6}

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C_{7} H_{14}, C_{2} H_{6}

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C_{7} H_{16}, C_{2} H_{4}

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C_{7} H_{14}, C_{2} H_{4}

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Solution

The correct option is A $C_{7} H_{16}, C_{2} H_{6}$
The general formula of alkane is $C_{n} H_{2 n + 2}$ . Hence, the molecular formula of heptane and ethane will be $C_{7} H_{16}$ and $C_{2} H_{6}$ respectively.
Theory :
Straight chain alkanes :
$Name Mol.Formula$
$Methane C H_{4}$
$ethane C_{2} H_{6}$
$Propane C_{3} H_{8}$
$Butane C_{4} H_{10}$
$Pentane C_{5} H_{12}$
$Hexane C_{6} H_{14}$
$Heptane C_{7} H_{16}$
$Octane C_{8} H_{18}$
$Nonane C_{9} H_{20}$
$Decane C_{10} H_{22}$

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C_{2} H_{6}

Write the :
(a) molecular formula,
(b) electron dot formula and
(c) structural formula of methane and ethane.

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