CH2I2 Lewis Structure & Characteristics (15 Helpful Facts)


ديودوميثان or methylene iodide is an organo-iodine compound with molecular mass 267.836 g/mol. Let us explore the structure and characteristics of CH2I2 موجز.

CH2I2 possesses a tetrahedron like structure with density 3.325 g/ml. It is a colorless liquid having boiling and melting point 182.10 C and 5.4 to 6.20 C. It can be decomposed in presence of light and liberates iodine. It has comparatively higher refractive index, 1.741 and surface tension 0.0508 N/m.

Let us focus on the lewis structure, hybridization, bond angle, solubility, polarity with some more relevant topics on methylene iodide or CH2I2.

كيفية رسم CH2I2 هيكل لويس؟

Lewis structure is drawn to get the idea of the lone pairs which are shown as electrons dot around the respective atoms. Let us draw the lewis structure of CH2I2.

Determining the valence electrons

Carbon and iodine have four and seven electrons in their respective outer most shell. Being a s-block element, hydrogen has 1 valence electron in its outer shell.

معرفة الإلكترونات الرابطة

There are total 4 covalent bonds present in methylene iodide molecule. Thus, (4×2) = 8 electrons are involved in covalent bond formation.

اكتشاف الإلكترونات غير المترابطة

In CH2I2, only iodine has nonbonding electrons or lone pairs which are shown as electron dots around the two iodine atoms.

ch2i2 lewis structure
CH2I2 هيكل لويس

CH2I2 شكل هيكل لويس

Lewis structure shape indicates the three-dimensional arrangement of atoms present in a molecule. Let us talk about this.

The shape of CH2I2 is tetrahedron like. Carbon is central atom and the four substituents, carbon, hydrogen and iodine occupy the four vertices of a tetrahedral. The molecular geometry of CH2I2 is also tetrahedral due to the sp3 تهجين الذرة المركزية.

The structure of CH2I2 is same as its molecular shape because of the absence of lone pair-lone pair and lone pair-bond pair repulsion. The reason behind the absence of these repulsive factors is that central atom carbon has no nonbonding electrons on itself.

Tetrahedral shape of CH2I2

CH2I2 المسؤول الرسمي عن هيكل لويس

Lewis structure formal charge is a theoretical charge or fake charge of the individual atom in a molecule. Let us calculate the formal charge carried by C, H and I in CH2I2.

The formal charge of CH2I2 is zero which can be calculated by using the formula = {Total number of valance electrons – number of nonbonding electrons– (number of electrons involved in bond formation/2)}.

  • الشحنة الرسمية للكربون = 4 - 0 - (8/2) = 0
  • Formal charge of each of the two hydrogen atoms = 1 – 0 – (2/2) = 0
  • Formal charge of each of the two iodine atoms = 7 – 6 – (2/2) = 0
  • Therefore, total charge carried by CH2I2 الجزيء صفر.

CH2I2 زاوية هيكل لويس

Lewis structure angle connects two covalent bonds with the central atom. Let us define this in detail.

The bond angle of CH2I2 هو 109.50, the ideal bond angle of a tetrahedron due to absence of lone pair-lone pair and lone pair-bond pair repulsion. These repulsive factors interfere to distort the bond angle from its ideal case.

CH2I2 لويس هيكل الثماني القاعدة

Octet rule is defined as the rule in chemistry of having eight electrons in the valence shell of the atom like their nearest noble gas in periodic table. Let us explain this in brief.

هيكل لويس من CH2I2 obeys the octet rule as the atoms of CH2I2 satisfies octet rule completely. Carbon has four valence electrons and when it forms bond with four substituent atoms, four more electrons are gained like its nearest noble gas neon, and octet rule is satisfied.

Iodine has seven valence electrons and after involving in formation of one bond, octet will be filled up and matches with its nearest noble gas xenon (Xe). Hydrogen does not obey octet rule rather it follows duplet because it achieves two electrons in its 1s orbital after one bond formation and resembles with its nearest noble gas helium.

CH2I2 أزواج هيكل لويس الوحيد

Lone pairs or nonbonding electrons are those unshared electrons of any atom which are not involved in bond formation. Let us discuss it.

The total number of lone pairs in CH2I2 is six (nonbonding electrons 12) which are possessed by the two iodine atoms. The number of lone pairs is calculated by the formula = (إجمالي عدد الإلكترونات في غلاف التكافؤ - عدد إلكترونات الترابط).

  • إلكترونات الكربون غير المترابطة = 4 - 4 = 0
  • Nonbonding electrons of each of the two hydrogen atoms = 1 – 1 = 0
  • Nonbonding electrons of each of the two iodine atoms = 7 – 1 = 6 or three lone pairs.
  • Therefore, total number of lone pairs = (3+3) = 6 or nonbonding electrons = (6×2) = 12.

CH2I2 إلكترونات التكافؤ

The electrons in the outer most shell of any atom are considered as the إلكترونات التكافؤ. Generally, these electrons participate in various chemical reactions. Let us explore it.

CH2I2 or diiodomethane has total 19 valence electrons which are calculated from the summation of the valence electrons of all of the atoms of CH2I2. The valence electrons of the atoms can be determined from their valence shell electron configuration.

Carbon and iodine belong to the p-block of periodic table and they have four (for carbon) and seven (for iodine) electrons in their respective valence shell. They have electron configuration 2s2 2p4 (carbon) and 5s2 5p5 (iodine). Being a s-block element, hydrogen atom has electron configuration 1s1, so it has only one valence electrons. Therefore, total number of valence electrons inCH2I2 is = {4 + (7×2) + 1} = 19.

CH2I2 تهجين

Atoms contain atomic orbitals and if two or more atomic orbitals are mixed to form a new hybrid orbital in a molecule, then it is called تهجين. دعونا نتحدث عن هذا.

The hybridization of CH2I2 هو sp3. One s and three p orbitals of carbon are involving in this hybridization with two hydrogen and two iodine. This sp3 hybridization directs the shape and the molecular geometry of CH2I2 to be tetrahedral because shape can only be decided from the hybridization of central atom.

هل CH2I2 صلبة أم سائلة؟

The physical state (solid, liquid or gas) depends upon the strength of the force of attraction present of the molecule. Let us give an overview on it.

CH2I2 is a colorless liquid compound. The boiling point of CH2I2 هو 182.10 C and melting point is in the range of 5.4 to 6.20 C. The appearance of CH2I2 is as liquid because the van der waals force of attraction is greater in it with respect to any gaseous molecule.

The reason behind the high van der waals force is the relatively higher molecular weight of CH2I2 with respect to its analogous compounds.

هل CH2I2 يذوب في الماء؟

Nature of the solute is the determining factor to be soluble in a particular solvent. Let us comment on it.

CH2I2 is soluble in water. The solubility of it in water is 1.24 g/lit at 200 C. The solubility of CH2I2 in water like polar solvent because it is a polar molecule and consists of two opposite dipoles (positive and negative dipole).

CH2I2 is soluble in water because it is able to break the H-bonding present in the H2O molecules. The positive end of the H2O is attracted by the negative part and the negative end of H2O is attracted by the positive part of CH2I2 molecule. In this way the H-bonding is broken and solute becomes soluble in water.

هل CH2I2 قطبي أم غير قطبي؟

Presence of the separation of opposite charge or the relative arrangement of the atoms in a molecule determines the molecule as polar or nonpolar. Let us talk about this.

CH2I2 is definitely a polar molecule with a permanent dipole moment. The polarity arises due to its tetrahedral structure. Because of this structure, the bond moment of CH2I2 cannot be cancelled by each other as the bond angle in CH2I2 هو 109.50.

If the bond angle is 1800, then the bond dipole will be cancelled by each other and the molecule does not show any polarity instead of having polar C-I bond (polar because electronegativity difference between carbon and iodine is relatively high).

هو CH2I2 حمض أم قاعدة؟

Acidity or basicity is a parameter of any atom of the capability of accepting or donating electron pairs to or from any molecules. Let us find an overview on it.

CH2I2 behaves as a lewis acid because it can accept electron pairs from any electron reach species (lewis base). Iodine is an electronegative element and it has the tendency to form hydrogen bonding (weak H-bonding) with the hydrogen bonded with any electron rich groups or atoms.

Besides that, the hydrogen atoms in CH2I2 is very much acidic due to presence of highly polar C-I bonds.  Iodine is an electronegative atom and it attracts the bonding electrons of C-I bond towards itself. Therefore, the electrons in the C-H bond is attracted by the carbon atom and the hydrogen will be eliminated easily from CH2I2 مركب.

هل CH2I2 الأيونية أو التساهمية؟

Covalent or ionic character of a molecule can be decided depending upon the interaction between the atoms or the bonds present in the molecule. Let us clarify it in detail.

CH2I2 is a covalent compound because of the presence of four سندات تساهمية between carbon, hydrogen and iodine. These bonds are formed when the electrons are shared between two bond forming atoms. This is the one of the most important characteristics of any covalent compound.

Ionic bonds are formed when electrons are completely transferred from lesser electronegative atom to relatively more electronegative atom. But the bonding electrons in CH2I2 are formed by the mutual sharing of electrons. But the sharing is not completely equal because the electronegativity of the constituent atoms of CH2I2 لا تتساوى.

هل CH2I2 بالكهرباء؟

Electrolytes are a specific substance in chemistry which can conduct electricity in after dissolving in solute due to dissociation into cations and ions. Let us discuss it.

CH2I2 does not behave as an electrolyte because it is not an ionic compound. Basically, ionic compounds work as electrolyte as they can be dissociated into two oppositely charged cation and anion and conduct electricity.

Covalent compounds do not contain any ions like ionic compound therefore, they cannot generate two opposite charges in aqueous solution. Due to incapability of producing ions, CH2I2 cannot behave as electrolyte.

هل CH2I2 ملح؟

Salts, similar with the electrolytes, are the ionic assembly of positive and negative ions containing two opposite ions but have no net charge. Let us comment on this.

CH2I2 is not a salt as it is a covalent compound. Covalent compounds generally do not behave as they do not contain any distinct ions. In maximum cases ionic compounds can be classified as salt because they are formed by two distinguishable ions, cation and anion.

في الختام

Diiodomethane or CH2I2 is one of the most useful chemical species produced by the reaction of dichloromethane (DCM) and sodium iodide (NaI). It is widely used to determine the density of minerals with some solid materials. It is also used to insert methylene group (CH2) through Simmons-Smith reaction in any alkene.

أديتي روي

مرحبًا ، أنا Aditi Ray ، شركة كيمياء صغيرة ومتوسطة الحجم على هذه المنصة. لقد أكملت تخرجي في الكيمياء من جامعة كلكتا وبعد التخرج من جامعة تكنو إنديا مع تخصص في الكيمياء غير العضوية. أنا سعيد جدًا لكوني جزءًا من عائلة Lambdageeks وأود أن أشرح الموضوع بطريقة مبسطة. دعنا نتواصل من خلال LinkedIn-https: //www.linkedin.com/in/aditi-ray-a7a946202

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