In each of the following groups, which is the strongest (best) nucleophile ?

(I)(1)H₃C-O^-            (2)                   (3)H₃C-S^- in CH₃OH

(II)(1)OH^-                (2) H₂O                        (3) ${\mathrm{NH}}_2^{-}$ in DMF

(III) (1)   (2)                  (3) CH₃O^- in DMSO

(a) I,3; II,3; III,2                                  (b) I,2; II,1; III,3

(c)  I,1; II,2; III,1                                 (d) I,3; II,1; III,3

(A) on heating isomerizes to (B). What is the structure of (B) ?

Which of the following statements is true?

1. CH₃CH₂S^- is both a stronger base and more nucleophilic than CH₃CH₂O^-

2. CH₃CH₂S^- is a stronger base but is less nucleophilic than CH₃CH₂O^-

3. CH₃CH₂S^- is a weaker base but is more nucleophilic than CH₃CH₂O^-

4. CH₃CH₂S^- is both a weaker base and less nucleophilic than CH₃CH₂O^-

What sequence of reagents is required to accomplish the following transformation?

1. (1) NBS, ROOR (2) CH₃CH₂O^- (3)2HBr (4) NH^-₂ (5) disiamylborane (6) H₂O₂,OH^-

2. (1) Cl₂hv (2) OH^-, heat; (3) 2HCl (4) OH-,heat (5) HgSO₄,H₂SO₄

3. (1) NBs,ROOR; OH-,DMSO

4. (1) Br₂,hv (2) t-butoxide (3) BH₃,THF (4) H₂O₂,OH^-

Ether cannot be produced as a major product by the reaction of: 

1.	CH3CH2Cl + Ag2O(dry)  →
2.	(CH3)3CCl + CH3CH2O-Na+  →
3.
4.

Predict the product when the given compound reacts with LiAlH₄ :
   

1.		2.
3.		4.

The labeled -O¹⁸ will be:


1. H₂O

2. Methyl benzoate

3. Both 1 and 2

4. Benzoic acid

Product (A) in the below mentioned reaction is:
 

1.

2.

3.

4.

Which of the following compounds is most prone to oxidation?
 

1.	\(\mathrm{CH}_3-\mathrm{CHOH}-\mathrm{CH}_3\)	2.
3.	\(\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{O}-\mathrm{CH}_2-\mathrm{CH}_3\)	4.

Product (P) is:

1.		2.
3.		4.