The non planar molecule among the follow...

The non planar molecule among the following is

`B_2 H_6`

`C_2 H_4`

`C_6 H_6`

`BCl_3`

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The correct Answer is:

To determine which molecule among the given options is non-planar, we will analyze the molecular structures and hybridizations of each compound. ### Step 1: Analyze B2H6 (Diborane) - **Structure**: Diborane (B2H6) consists of two boron atoms and six hydrogen atoms. The structure is such that: - Each boron atom is bonded to four hydrogen atoms. - Two of the hydrogen atoms are bridge hydrogens, which connect the two boron atoms. - The other four hydrogen atoms are terminal hydrogens. - **Hybridization**: The hybridization of boron in B2H6 is sp³. This means that: - The terminal hydrogens are in the same plane as the boron atoms. - The bridge hydrogens are positioned above and below this plane, making the overall structure non-planar. ### Step 2: Analyze C2H4 (Ethylene) - **Structure**: Ethylene (C2H4) consists of two carbon atoms double-bonded to each other, with each carbon atom bonded to two hydrogen atoms. - **Hybridization**: The hybridization of each carbon atom in C2H4 is sp². This results in a planar structure, as all atoms lie in the same plane. ### Step 3: Analyze C6H6 (Benzene) - **Structure**: Benzene (C6H6) is a cyclic compound with six carbon atoms bonded in a ring, with alternating double bonds. - **Hybridization**: Each carbon atom in benzene is also sp² hybridized. The planar arrangement of the carbon atoms and the delocalized π electrons contributes to the planar structure of benzene. ### Step 4: Analyze BCl3 (Boron Trichloride) - **Structure**: BCl3 consists of one boron atom bonded to three chlorine atoms. - **Hybridization**: The hybridization of boron in BCl3 is sp², leading to a trigonal planar geometry. All atoms in BCl3 are in the same plane. ### Conclusion After analyzing all the molecules: - B2H6 is the only non-planar molecule due to the presence of bridge hydrogens that are positioned above and below the plane of the terminal hydrogens and boron atoms. - C2H4, C6H6, and BCl3 are all planar. Thus, the non-planar molecule among the options is **B2H6**.