Question

The standard enthalpies of n-pentane, isopentane and neopentane are $-35.0,-37.0$ and $-40.0$ $Kcal/mole$ respectively. The most stable isomer of pentane in terms of energy is ____________.

• A. n-pentane
• B. isopentane
• C. neopentane
• D. n-pentane and isopentane

Answer 1

Answer: (C)

neopentane

The standard enthalpies of n-pentane, isopentane and neopentane are -35.0, -37.0 and -40.0 K.cal/mole respectively. The most stable isomer of pentane in terms of energy is neopentane as it has most negative value of the standard enthalpy.