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51.

The order of leaving group ability is :A. `(i) gt (ii) gt (iii) gt (iv)`B. `(iv) gt (iii) gt (i) gt (ii)`C. `(iii) gt (ii) gt (i) gt (iv)`D. `(ii) gt (iii) gt (iv) gt (i)`

Answer» Correct Answer - B
Weaker the base, better is the leaving group.
Acidity : `F_3 C - SO_3 H gt MeSO_3 H gt AcOH gt MeOH`.
Basicity : `underset (iv) (F_3)C^(Ө) lt underset (iii) MeSO_3^(Ө) lt underset (i) AcO^(Ө) lt underset (ii) MeO^(Ө)`
Leaving group : `(iv) gt (iii) gt (i) gt (ii)`.
Discussion
52.

During debromination of meso-dibromobutane, the major compound formed is :A. n-ButaneB. 1-ButeneC. cis-2-ButaneD. trans-2-Butene

Answer» Correct Answer - D
meso compound + anti-elimination of `Br_2 rarr` trans-alkene.
Discussion
53.

Meso-tartaric acid is formed in :A. `(I),(II),(V)`B. `(III),(IV),(VI)`C. `(I),(II),(IV)`D. `(III),(IV),(V)`

Answer» Correct Answer - B
Rule `d`
Discussion
54.

Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the intermediate carbocation is more resonance stabilised.A. Statement `I` is true, Statement `II` is true , Statement `II` is the correct explanation of Statement `I`.B. Statement `I` is true , Statement `II` is true , Statement `II` is not the correct explanation of Statement `I`C. Statement `I` is true , Statement `II` is false.D. Statement `I` is false , Statement `II` is true.

Answer» Correct Answer - A
Both statements are correct and Statement `II` is the correct explanation of Statement `I`.
Discussion
55.

Which of the following statements are correct ?A. The reaction of t-butyl chloride with `overset (Ө) O H` follows first-order kinetics.B. An `SN^1` reaction proceeds with the inversion of configuration.C. An `SN^2` reaction follows second-order kinetics.D. An `SN^2` reaction proceeds with stereochemical inversion.

Answer» Correct Answer - A::C::D
The option (b) is wrong. `SN^1` reaction proceeds with racemisation and retention of configuration.
On the other hand, (a), (c), and (d) are self-explanatory.
Discussion
56.

Which of the following are `SN^2` reactions ?A. B. `Me_3 C - Br + KOH rarr Mr_3 C - OH + KBr`C. `Et - I + EtONa rarr Et - O - Et + NaI`D. `Et - Cl + NaOH rarr EtOh + NaCl`

Answer» Correct Answer - C::D
`1^@ RX` undergoes `SN^2` reaction.
Discussion