Which of the following is incorrect regarding the alkanes?A. (1) All alkynes contain just one triple bond.B. (2) The hybridization of two `C` atoms is `sp` hybridization.C. (3) The carbon-carbon triple bond of alkynes consists of two pi `(pi)` bonds and one sigma `(sigma)` bond.D. (4) There is resitricted rotation of groups joined by a triple bond.

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

1.	Which of the following is incorrect regarding the alkanes?A. (1) All alkynes contain just one triple bond.B. (2) The hybridization of two `C` atoms is `sp` hybridization.C. (3) The carbon-carbon triple bond of alkynes consists of two pi `(pi)` bonds and one sigma `(sigma)` bond.D. (4) There is resitricted rotation of groups joined by a triple bond.
Answer» Correct Answer - D Cylindrical symmetry exists along the length of a triple bond due to sideways overlap involving two pairs of `p`-orbitals. As a result, there is no restricted rotation for groups joined by a triple bond.

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