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Nucleophilic Substitution in Aryl Halides

assertion: ci...

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assertion: cis-1,3-dihydroxycyclohexane exists in boat conformation reason: in the boat form there will not be hydrogen bonding between the 2 hydroxyl groups

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Q. Why is half chair conformation of cyclohexane less stable than boat conformation? Actually in boat configuration there is repulsion between flag hydrogen ,but in half chair conformation there is no such repulsions. Then why is boat conformation more stable?

Q. Assertion :Cis-form of alkene is found to be more polar than the trans-form. Reason: Since the groups are in opposite directions in the trans-form, the dipole moments of bonds cancel each other making trans-form almost non-polar.

Q. Assertion :Both cis-1,3-dimethyl cyclobutane and trans-1,3-dimethyl cyclobutane are optically inactive. Reason: cis-1,3-Dimethyl cyclobutane has the plane of symmetry, where as trans form has the centre of symmetry.

⎛ ⎜ ⎜ ⎝ C H_{3} - C H | C l - C H = C H - C H | C l - C H_{3} ⎞ ⎟ ⎟ ⎠

The cis form exists in three - diastereomers. Reason: One forms is optically inactive due to the presence of centre of symmetry.

Q. Assertion :Glucose is soluble in water. Reason: There is hydrogen bonding in water.

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Nucleophilic Substitution in Aryl Halides

Standard XII Chemistry

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