What atomic or hybrid orbitals make up the sigma bond between c2 and c3 in propyne, chcch3 ? (c2 is the second carbon in the structure as written.) orbital on c2 + orbital on c3 what is the approximate c1-c2-c3 bond angle ? °?

The atomic or hybrid orbitals make up the sigma bond between C2 and C3 in propyne are sp3 and sp hybrid orbitals.

Hybrid orbitals involve the combination of two or more orbitals. The resultant hybridized orbitals are equivalent in energy are are used in chemical b atom bonding.

The C2 and C3 in propyne involves bonding between an sp hybridized C2 atom and an sp3 hybridized C3 atom. An overlap of these atoms gives the bond between C2 and C3 in propyne.

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Explanation:

(a) Hybridization of orbitals

See the Lewis structure of propyne in the first diagram below.

C1 is directly bonded to two other atoms (H and C2) so it is sp hybridized.

C2 is directly bonded to two other atoms (C1 and C3) so it is sp hybridized.

C3 is directly bonded to four other atoms (C2 and 3 H) so it is sp³ hybridized.

(b) C2-C3 Sigma Bond

See the atomic and molecular orbitals in the second picture below.

C3 is using its hybrid atomic orbitals to form sigma molecular bonds. The C2-C3 sigma bond is formed by the overlap of the C2 sp atomic orbital with the C3 sp³ atomic orbital to make a σ(sp-sp³) molecular orbital.

(c) Bond angles

C1 and C2 are sp hybridized. Since the angle between sp orbitals is 180°, all atoms directly attached the C1 and C2 must be in a straight line. The C-C-C bond angle is 180°.

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