Which of the following is incorrect regarding the alkanes?A. (1) All the bonds in the molecules of alkanes are pi `pi)` bonds.B. (2) The hybridization of two `C` atoms in alkanes is `sp^(2)`.C. (3) There is a large energy barrier to rotation associated with groups joined by a double bond.D. (4) The restricted rotation of groups joined by a double bond causes cis-trans isomerism.

Which of the following is incorrect regarding the alkanes?A. (1) All t

1.	Which of the following is incorrect regarding the alkanes?A. (1) All the bonds in the molecules of alkanes are pi `pi)` bonds.B. (2) The hybridization of two `C` atoms in alkanes is `sp^(2)`.C. (3) There is a large energy barrier to rotation associated with groups joined by a double bond.D. (4) The restricted rotation of groups joined by a double bond causes cis-trans isomerism.
Answer» Correct Answer - A The molecules of alkenes contain just one pi `(pi)` bond (present in the carbon-carbon double bond). The rest of the bonds are sigma bonds. The strength of the `pi` bond is `264 kJ mol^(-1)` in comparison to the `sigma` bond `(13-26 kJ mol^(-1))`.

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