Question

The molecular formula of an alkane with molecular weight 86 is ____________.

Options

• C₇H₁₆

• C₆H₁₄

• C₅H₁₂

• C₆H₁₂

Answer 1

The molecular formula of an alkane with molecular weight 86 is C₆H₁₄.

Explanation:

C_nH_2n+2 = 86

∴ (n × 12) + (1 × 2 × n) + (1 × 2) = 86

∴ 12n + 2n + 2 = 86

∴ 14n = 84

∴ n = 6

Therefore, `"C"_6"H"_((2xx6+2))` = C₆H₁₄