Chemical Bonding And Molecular Structure

To solve this question, we need to identify the type of bond present in each molecule listed in Group I and match it with the correct bond type in Group II.

1. NaCl: Sodium chloride is a classic example of an ionic compound. It forms an ionic bond because it consists of positively charged sodium ions ( ) and negatively charged chloride ions ( ). Hence, it matches with 4) Ionic bond.
2. : Molecular hydrogen consists of two hydrogen atoms sharing a pair of electrons, forming a covalent bond. This matches with 3) Covalent bond.
3. bond in : The palladium-phosphorus bond in this compound is a result of a coordination bond, where the phosphorus atom donates a lone pair of electrons to the palladium. This matches with 1) Coordination bond.
4. bond in : The bond between carbon and chlorine in chloromethane (methyl chloride) is a polar covalent bond. This is due to the significant electronegativity difference between carbon and chlorine, which causes a partial charge separation. This matches with 2) Polar covalent bond.

Based on the above analysis, the correct matches are:

• P-4: NaCl is an ionic compound.
• Q-3: has a covalent bond.
• R-1: bond in is a coordination bond.
• S-2: bond in is a polar covalent bond.

Therefore, the correct answer is: P-4, Q-3, R-1, S-2.

• Alkyl Substitution: Alkyl groups are electron-donating and stabilize the positive charge on the nitrogen when the amine donates a pair of electrons, increasing basicity.
• Steric Hindrance: Larger groups can hinder the approach of the proton and reduce basicity.

1. (Isobutylamine): Has an electron-donating isobutyl group. Typically more basic than due to greater electron donation.
2. (Ammonia): Has no alkyl groups, making it generally less basic than alkylamines like .
3. (Dimethylamine): Contains two methyl groups; more electron-donating capacity than , thus more basic.
4. (Ethylamine): Similar to but with a slightly larger alkyl group; typically more basic than .

Ionic character depends on the electronegativity difference between bonded atoms. NaF has the highest ionic character due to the large difference between sodium and fluorine.