b. c. 16) Resonance structures differ by a. number and placement of electrons b.
ID: 551598 • Letter: B
Question
b. c. 16) Resonance structures differ by a. number and placement of electrons b. placement of atoms only c. number of electrons only d. placement of electrons only e number of atoms only 17) of the bonds C-C,C= C, and CEC, the C-C bond is a. strongest/shortest b. weakest/shortest c. d. intermediate in both strength and length e. weakest/longest 18) The bond angles marked a, b, and e in the molecule below are about , and respectively. a. 90, 180°, 90 b. 120, 109.5, 120° c. 109.5, 109.5°, 120 d. 109.5, 109.5, 90 e. 109.5, 109.50, 109.5 19) The molecular geometry of the PF3 molecule is and this molecule is a tetrabedral, unipolar b. trigonal planar, nonpolar c. trigonal pyramidal, polar d. trigonal planar, polar e trigonal pyramidal, nompolar 20) bybrid orbitals are used for bonding by Xe in the XeF4 molecule b. sp c. sp'd d.sp 82 e,Explanation / Answer
16. Ans: Resonance structres are differ by placement of electrons only.
17. Ans: C-C bond is weakest bond and longest bond in comparitively with the others.
18. The bond angles marked by a, b, c, are 109.5o, 109.5o and 120o.
Explaination: The marked position 'a' nitogen with SP3 hybridzation so bond angle must 109.5o or less (due to one lone may be less than 109.5o). At position 'b' also carbon in SP3 hybridization so the angle is = 109.5o. but at position 'c' carbon with SP2 hybridization so bond angle is 120o.
19. Ans: Trigonal pyramidal and polar. In PF3 molecule phosphorous undergo SP3 hybrdization and with P atom there is presence of one lone pair. So tirgonal pyramidal structre. and due to presence of lone pair it is a polar molecule,
20. Ans: In XeF4, Xenon under go SP3d2 hybridization and with Xe atom two lone pairs present.
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