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Answer : The correct option is, (D) NaCN

Explanation :

Ionic compound : Ionic compound are the compounds in which atoms are bonded through ionic bond.

Ionic bonds are formed by the complete transfer of electrons. The atom which looses the electron is considered as electropositive atom and the atom which gains the electron is known as electronegative atom. These bonds are formed between one metal and one non-metal.

Covalent compound : Covalent compound are the compounds in which atoms are covalently bonded.

Covalent bonds are formed by the equal sharing of electrons. These bonds are commonly formed between two non-metals.

As per given options, [tex]KI[/tex] and [tex]CaCl_2[/tex] are the ionic compounds in which 'K' and 'Ca' are the metals and 'I' and 'Cl' are the non-metals that are bonded through the ionic bond.

The option [tex]CH_2Br_2[/tex] is a covalent compound in which the carbon, hydrogen and bromine atoms are non-metal that are bonded through the covalent bond.

While the option, [tex]NaCN[/tex] is the compound that contains both ionic and covalent bonds. In NaCN compound, [tex]Na^+[/tex] ion and [tex]CN^-[/tex] ion combines to form an ionic bond and in [tex]CN^-[/tex] ion, carbon and nitrogen combine to form a covalent bond.

Hence, the correct option is, (D) NaCN

ardni313

D.NaCN contains both ionic and covalent bonds

Further explanation

Elements based on electrical conductivity can be divided into two elements, namely metal elements (conductors) and non-metals (non-conductors / insulators)

In modern periodic systems, the metal element is generally located on the left while the non-metal is on the right.

The formation of electron configurations such as noble gases can be done by sharing electrons with covalent bonds or hand over electrons with ionic bonds

  • 1. ionic bonding

Bonding that occurs due to electron handover. Can occur in metal and non-metal atoms. To get stability, atoms release or bind electrons to get stable electron regulation from noble gases

  • 2. covalent bonding

Bonding that occurs due to shared use of electron pairs

The two bound atoms contribute their electrons to produce bonds

Generally occurs in non-metallic elements

The small difference in electronegativity between two nonmetal elements results in a non-polar covalent bond. Whereas the greater electronegativity difference makes the compound ionic

So if the electronegativity difference between the atoms is greater than 1.7, the compounds formed are ionic.

  • A. KI

An ionic bond occurs between metal K⁺ (group 1A) and non-metal I⁻ (group 7A)

  • B. CaCl₂

An ionic bond occurs between the Ca²⁺ metal (group 2A) and the non-metal Cl⁻ (group 7A)

  • C. CH₂Br₂

A covalent bond occurs between C, H and Br (all non-metal)

  • D.NaCN

An ionic bond occurs between the Na + metal (group 1A) and CN- (cyanide) and the CN covalent bond between nonmetal C (class 4A) and nonmetal N (VA group)

Learn more

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