Question

how does a straight - chain alkane that has five carbon atoms differ from a cycloalkane that has five carbon atoms? the straight - chain alkane has at least one double or triple bond, but the cycloalkane has only single bonds. the straight - chain alkane has only single bonds, but the cycloalkane has at least one double or triple bond. the straight - chain alkane has two more hydrogen atoms than the cycloalkane. the straight - chain alkane has two fewer hydrogen atoms than the cycloalkane.

Explanation:

Alkanes have the general formula $C_nH_{2n + 2}$ for straight - chain alkanes. For a straight - chain alkane with $n = 5$ (pentane), the formula is $C_5H_{12}$. Cycloalkanes have the general formula $C_nH_{2n}$. For a cycloalkane with $n = 5$ (cyclopentane), the formula is $C_5H_{10}$. So the straight - chain alkane has two more hydrogen atoms than the cycloalkane. Also, both straight - chain alkanes and cycloalkanes only have single bonds.

Answer:

The straight - chain alkane has two more hydrogen atoms than the cycloalkane.