Electromeric Effect

Q.

The decreasing order of the repulsive interactions between various electron pairs is:

1. lp-lp>lp-bp>bp-bp

2. bp-bp>lp-lp>lp-bp

3. lp-bp>bp-bp=lp-lp

4. lp-bp>lp-lp>bp-bp

Q. 22.What is conjugated diketone ( benzoquinone).

Q. 12. which of the following is isostructural? XeF2, IF2- NH3, BF3 CO32- , SO32- PCl5, ICl5? and, how?

Q.

A reagent that brings an electron pair is known as:

1. Conjugation

2. Nucleophile

3. Inductivity

4. Electrophile

Q. 5.Which of the following will not show peroxide linkage (1) Cro5 (2) o2F2 (3) H2so5 (4)H2O2

Q. what is the thetmal stability & acidic nature order of group 14 hydrides?

Q. among the foll the strongest nucleophile is: 1.C2H5SH 2.CH3COO- 3. CH3NH2 4. NCCH2

Q. What is the hybridisation of cental atom in CrO3

Q. The group which is most activating is 1)NO2 2)NH2 (2) -OCH (4) -OH

Q. 47. How many electrons present in 10g CH4?

Q. 17. How many hydrogen-bonded water molecule(s) are associated in Cuso, 5H2O

Q. 41.What happens if Trimerization of Propyne (C3H4)takes place ?

Q. The difference between number of shared electron pairs and unpaired electrons in NH3 i

Q. Why is formic acid more acidic than benzoic acid even though the conjugate base of benzoic acid is stabilized by resonance?

Q. 99 secB:17 . The number of electron present in 1.6g of CH4 is approximately?

Q. Balance by iso electron method As2 S3 +NO3- -----------> AsO4 -3 +NO +S

Q. In diborane, the two H-B-H angles are nearly

1. 60°, 120°

2. 95°, 120°

3. 95°, 150°

4. 120°, 180°

Q. 16. how to calculate total no of resonating structures in any given compound be like anthracene or napthalene

Q. the number of unpaired electron in O2 molecule is

Q. Which of the following is true regarding electromeric effect?

1. Involves complete shifting of $\pi$ electrons.
2. It is a temporary effect.
3. In -E effect , $\pi$ electrons of the multiple bond are transferred to the atom to which the reagent gets attached.
4. It operates in organic compounds having multiple bonds under the influence of an outside attacking species.

Q. What is the formal charge on nitrogen in Nitrogen pentoxide?

Q. Arrange in the increasing order of acidity
1 H2O , H2S , H2Se , H2Te
2 SiH4 , PH3, H2S, HCL

Q. 0/4The correct sequence of increasingmeltingpoints of BeC12, MgC12, CaC12, SrC12 andBaCI2is(a) BaC12< SrC12MgCl2 BaCl2CaCI2