Which of the following statements are correct?

Options

A. (a) `DeltaH_c^@` of cis-pent-2-ene is greater than trans-pent-2-ene
B. (b) `DeltaH_c^@` of hex-1-ene is greater than trans-hex-2-ene
C. (c) `DeltaH_c^@` of 2,5-dimethyl hexane is greater than octane
D. (d) `DeltaH_c^@` of 2-methyl-pent-2-ene is greater than trans-hex-2-ene
`DeltaH_c^@=`Heat of combusion

Answer

A, B, D

Explanation

Lower the `DeltaH_C^@`, more stable is the compound, So trans alkane is more stable than cs alkene. The statement (c) is wrong because 2,5-dimethyl hexane is more stalbe (due to smaller surface area) than octane. Therefore, `DeltaH_C^@` of 2, 5-dimethyl hexane should be lower than octane.