1. Which of the following is true about pi bonds? true A. limits rotation about

Question

1. Which of the following is true about pi bonds? true A. limits rotation about the bond axis B. C.Involves 2 s orbitals D. occurs on the bond axis involves es end-to-end overlap of bonds pe of bond is between the C and N in the most important structure for the molecule CICN A. cannot be determined B. double bond C. single bond D. triple bond 3. In the molecule H2, how many electrons are in the *is orbital? A. cannot be determined 2 C.) 0 D. 1 4. Which of the following molecules would have a dipole moment not equal to 0 (is a polar molecule)? A. 03 B. N2 C. H2C-CH3 D. CCI4 Use VSEPR theory to decide which one of the following molecules will definitely have at least one 120° bond angle in it. 5. A. NH3 B. CH4 C. CO D. PCls E. H20 co2

Explanation / Answer

Q1)a:Pi bonds are formed perpendicular to the plane.It is stable in one orientation only, therefore it breaks on rotation or we can say that it restricts rotation along bond axis.

b:end to end overlap is involved in sigma bonding.

c:it involves both s and p orbitals.

d;it occurs in the plane perpendicular to the bond axis.

Therefore only option a is correct.

Q2); Cyanogen Chlorine C is connected to N by a triple bond and there is only one bond between C and Cl.

Q3) H2 has total two electrons.considering the energy level,sigma has less energy than sigma star orbital.

So elecons will be first filled in sigma 1s bond.since it can accommodate 2 electrons,so there are no electrons in sigma star orbital.

Q4): In CCl4,angle between trans position of C and Cl is 180 degree, which cancels the dipole moment.Hence net dipole moment is zero.

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