Quiz 5 1. Which electron-pair geometry has the lowest electron-electron repulsiv

Question

Quiz 5 1. Which electron-pair geometry has the lowest electron-electron repulsive forces? a linear b. trigonal planar d. trigosal bipyramidal e, octahedral 2.What is the steric number of the central nitrogen atom in NF 3.What are tho ideal bond angles around carbon in CHO? d. 109.5 e,60, 120 4. Determine the molecular geometry of CF Ch d. tetrahedral a. linear b. bent c. trigonal bipyramidal trigonal pyramidal 5. Which would have the largest effect on a neighboring bond angle? d. two single bonds a two lone pairs of electrons b. one lone pair of electrons and a double bond e two double bonds one double bond and a single bond 6All homonuclear diatomic molecules a. have polar bonds b. are polar c are nonpolar d cannot vibrate. e. are liquids. 8 Which of the following shows the orientation of the met dipole for OCS? e. none of these O-C-S 9.Which of the following compounds has the smallest dipole moment? d. CFCh CHFC a. CFC b.CFC? c CF

Explanation / Answer

[1] the answer is (a) linear.

Explanation: In case of linear shape, the two electron pairs are at maximum angle (1800), while in rest of the cases the electron pairs are at an angle <1800. Farther the electron pairs lesser will be the repulsion. Hence, the answer is (a) linear.

[2] The answer is (c) 4

Explanation: steric number is defined as the sum of number of atoms bonded to central atom and number of lone pairs on central atom. In NF3. 3 F atoms are bonded to central atom N. Also, there is 1 lone pair on N.

Hence, steric number = no. of atoms bonded to central atom + no. of lone pairs on central atom

                                = 3 + 1 = 4

[3] the answer is (c) 1200

Explanation: In CH2O central atom carbon hybridisation is sp2, which corresponds to a trigonal planar structure. In which the three sp2 hybrid orbitals are at 1200 to minimize the repulsion term.

Alternatively, central Carbon atom is attached to three atoms (2 hydrogen and 1 oxygen). To minimize the repulsion between the three bond pairs, the bonds should be at maximum possible angle, which is again 1200.

[4] the answer is (d) tetrahedral

Explanation: In CF2Cl2, central carbon atom is bonded to four atoms (2 F and 2 Cl). So, it has 4 bond pairs. Now, again to minimize repulsion between the bond pairs, they should be at maximum possible angle. which is 109.50. And, the shape attained for this is tetrahedral.

Alternatively, the hybridisation of central carbon atom is sp3, which corresponds to tetrahedral shape, to attain the minimum repulsion in space between the 4 sp3 hybdrid orbitals.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.