Which of the following is incorrect regarding the alkanes?A. (1) All the bonds in the molecules of alkanes are sigma bonds.B. (2) The hybridization of every `C` atoms in alkanes is `sp^(3)`.C. (3) The bond angles at the `C` atoms of all alkanes are tetrahedral, i.e., `109.5^(@)`.D. (4) The rotation of group joined by a single bond usually requires a large amount of energy.

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 sigma bonds.B. (2) The hybridization of every `C` atoms in alkanes is `sp^(3)`.C. (3) The bond angles at the `C` atoms of all alkanes are tetrahedral, i.e., `109.5^(@)`.D. (4) The rotation of group joined by a single bond usually requires a large amount of energy.
Answer» Correct Answer - D A sigma bond (i.e., any non-multiple bond) has cylindrical symmetry along the bond with respect to the bonded atoms. Therefore, rotation is practically unhindered.

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