Long Answer TypeDifferentiate between a covalent bond and co-ordinate bond.
| Covalent Bond | Co-ordinate Bond |
| 1. This is formed by sharing of two electrons. Each atom supplies electron. A. +. B → A:B. |
1. One atom contributes an electron pair while the sharing is done by both atoms. X : + Y → X : Y |
| 2. Denoted by A - B | 2. Denoted by Xδ+ → Yδ– |
| 3. Formed between electron deficient atoms. | 3. Formed between a donor with a lone pair and an acceptor (electron pair deficient). |
| 4. Formed between atoms. | 4. Formed between molecules or between molecules and ions. |
Short Answer TypeLong Answer TypeName the theory responsible for the definite geometry of covalent molecules. Give main features of the theory ?
Short Answer TypeHow will you explain the following order of the repulsive interactions between pair of electrons on the central atom:
Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair.
Long Answer TypeOn the basis of VSEPR theory, discuss the geometry of the following covalent molecules: (i) BeF2 (ii) BF3 (iii) CH4.
Short Answer TypeAlthough geometries of NH3 and H2O molecules are distorted tetrahedral, the bond angle in water is less than that of ammonia. Discuss.
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