Which of the following statement is correct ?

Options

A. Dipole moment :

B. Stability of free radical :

C. Basic strength : `CH_3 O^(Ө) gt overset (Ө) O H gt R S^(Ө)`
D. Basic and nucleophilic strength : `I^(Ө) gt Br^(Ө) gt C1^(Ө) gt F^(Ө)`

Answer

A, B

Explanation

(a,b)
(a) The smaller the angle, the larger the dipole moment, so `mu` of `I gt II gt III`.
(b) (I) is `3^@` Allylic with conjugation.
(II) is `3^@` Allylic.
(III) `3^@` free radical. Hence, the order is `I gt II gt III`.
( c) Acidity : `RSH gt CH_3OH gt H_2 O`
Basic strength : `RS^(Ө) lt CH_3 O^(Ө) lt overset (Ө) O H`
(d) Acidity : `HI gt HBr gt CH1 gt HF`
Basicity : `I^(Ө) lt Br^(Ө) lt C1^(Ө) lt F^(Ө)`
Nucleophilic : `I^(Ө) gt Br^(Ө) gt C1^(Ө) gt F^(Ө)`
When nucleophilic centres are different and belong to the same group of periodic table, nucleophilicity is antiparallel to basicity.