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KCET 2026 Chemistry Solved Paper

Question : 21 of 60

Marks: +1, -0

\mathrm{C}_{20} \mathrm{H}_{42}

Solution:

Concept:

Alkanes follow the general formula

\mathrm{C}_n\mathrm{H}_{2n+2}

. Identifying the number of carbon atoms gives the IUPAC name.

Explanation:

Given molecular formula:

\mathrm{C}_{20}\mathrm{H}_{42}

For an alkane,

\mathrm{C}_n\mathrm{H}_{2n+2}

Here,

n = 20

Then, hydrogen atoms

= 2(20) + 2 = 42

So, the formula matches an alkane with 20 carbon atoms.

The alkane with 20 carbon atoms is named eicosane.

Answer:

Option C: Eicosane.

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