Which of the following are constitutional isomers? A) I, II, and III B) I, III,
ID: 523841 • Letter: W
Question
Which of the following are constitutional isomers? A) I, II, and III B) I, III, and IV C) only I and III D) all are constitutional isomers The formal charges on the nitrogen and oxygen in the following structures are, respectively: A) +1, -1 B) 0, -1 C) +1, 0 D) 0, 0 Based on the VSEPR model, which of the following species has (have) a trigonal planar geometry? I. BCl_3 II. NH_3 III. NO^-_3 A) only I B) I and II C) I and III D) I, II, and III The H-C-H bond angles in ethylene, C_2H_4, are closet to A) 90 degree. B) 109.5 degree C) 120 degree. D) 180 degree.Explanation / Answer
2) constitutional isomers are the compounds having same molecular formula , with different structures.(May be chain, position or functional).
Thus option a is the right choice and structure IV does not have same molecular formula.
3) option A
CH3 -C=N-O
formal charge = number of electrons in netral atoms - number of electrons belonging to it after bond formation
Nitrogen has 4 bonds .
F.C on N = 5 -4 (one each from 4 bonds) = +1
F.C on O = 6 -7 (3 lone pairs and one from one bond) = -1
4)OPtion C
BCl3 Central atom B has 3 bond pairs and no lone pairs, thus planar trigonal shape.
NO3- central atom N has 3 bond pairs and no lone pair (one double bond) so trigonal planr.
5) In ethylene, the central atom both carbons are sp2 hybridised and thus the bond angle is 1200.