12) A typical double bond oi A) is stronger and shorter than a single bond B) co

Question

12) A typical double bond oi A) is stronger and shorter than a single bond B) consists of one ? bond and one ? bond C) imparts rigidity to a molecule D) consists of two shared electron pairs E) All of the above answers are correct. 13) Of the following molecules, only is polar. A) BeCl2 B) BF3 C) CBr4 .ei D) SiH2Cl2 E) Cl2 , and this molecule is 15) The molecular geometry of the PF3 molecule is A) trigonal planar, polar B) trigonal planar, nonpolar C) trigonal pyramidal, polar D) trigonal pyramidal, nonpolar E) tetrahedral, unipolar levol vatana nitelb to 0 is MIT A 100 00 16) What is the molecular shape of H20? A) T-shaped B) tetrahedral C) linear D) trigonal pyramidal E) bent a10 roto 17) The molecular geometry of the left-most carbon atom in the molecule below is H 0 ?» A) trigonal planar B) trigonal bipyramidal 08 D) octahedral E) T-shaped

Explanation / Answer

Q12 Correct option is (E) all of the above answers are correct

Q13 Correct option is (D) SiH2Cl2

Q15 Correct option is (C) Trigonal pyramidal, Polar

Q16 Correct option is (E) Bent

Q17 Correct option is (C) tetrahedral

Explanation

Q12. A double bond consists of two bonds between two atoms and each bond consists of two shared electrons or one pair of shared electrons. Therefore two bonds will have two pairs of shared electrons. Also since more electrons are involved as compared to single bond, therefore attraction forces increase which leads to shorter bond length.

Q13. In SiH2Cl2 , chlorine's lone pair and its electronegativity make the compound a polar molecule. There's a net charge going to Cl that makes the compound slightly to very lightly polar. The molecule is also polar since the electronegative difference between Si-Cl is larger than that of the electronegative difference between Si-H.

Q15. Phosphorus has 5 valence electron out which 3 are used to make bonds with fluorine and other two electrons are not used. From the VSEPR theory, PF3 is of the type AX3E1 and molecular geometry defined is trigonal pyramidal. Also the lone pair on phosphorus makes it a polar molecule

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