Difference in number of hydrogen atoms between pentyne and pentane is __________.

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Solution

The correct option is B 4
Pentane is a saturated molecule. Saturated hydrocarbons have the general formula $C_{n} H_{2 n + 2}$ . Hence, pentance has 12 hydrogen atoms.
Pentyne is an unsaturated molecule having 8 hydrogen atoms from the formula $C_{n} H_{2 n - 2}$ .
The difference of number of hydrogen atoms between pentyne and pentane is 12-8=4.

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