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s and p Overlap

Why is angle ...

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Why is angle between two bonds in tetrahedral model 109°28'?

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Q. Assume that in

C H X_{3}

, only the CX bond is polar and it has

20 %

ionic character. Also,

C H X_{3}

is a perfect tetrahedral i.e.

∠ H C X = ∠ X C X = 109^{\circ} 28^{^{'}}

. If the C-H bond length is 150 pm, then find dipole moment (in Debye) of

C H X_{3}

c o s (180 - 109^{\circ} 28^{^{'}}) = \frac{1}{3}

Q. In which one of the following pairs the interatomic bond angle is

109^{\circ} 28^{'}

120^{\circ}

Q. Which among of the following pairs has the bond angle

109^{\circ} 28^{'}

?

Q. Give reasons of the following.
(i) Phenol is more acidic than methanol.
(ii) The C-O-H bond angle in alcohols is slightly less than the tetrahedral angle

(109^{\circ} 28^{^{'}})

(C H_{3})_{3} C - O - C H_{3}

on reaction with HI gives

(C H_{3})_{3} C - I a n d C H_{3} - O H

as the main products and not

(C H_{3})_{3} C - O H a n d C H_{3} - I

.

Why is the C - O - H bond angle in alcohols slightly less than the tetrahedral angle whereas the C - O - C bond angle in ether is slightly greater?

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