$\underset{{\mathrm{CH}}_2{\mathrm{Cl}}_2}{\overset{{\mathrm{Br}}_2}{\to }}$ W. Product W is:

1. 

2. 

3. 

4. 

The best method to prepare cyclohexene from cyclohexanol is by using:

1. Conc. HCl + ZnCl₂                     

2.  Conc. H₃PO₄

3. HBr                                           

4. Conc. HCl

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^-

What is the major product in the given following reaction?

1.
2.
3.
4.

Which of the following is the strongest acid?

1. HC $\equiv$ CH

2. C₆H₆

3. C₂H₆

4. CH₃OH

$\underset{\left(Predominant\right)}{\left(\mathrm{B}\right)}\stackrel{PB{r}_{\mathit{3}}}{\leftarrow }$$\stackrel{\mathrm{HBr}}{\to }\underset{\left(Predominant\right)}{\left(A\right)}$

(A) and (B) are respectively :

$\underset{\mathrm{heat}}{\overset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}\underset{major}{P}\stackrel{NBS}{\to }\underset{major}{Q}$

The structure of Q is?

R–CH₂–CH₂–OH can be converted into
R–CH₂–CH₂–COOH. The correct sequence of
reagents is

1. PBr₃, KCN, H₃O⁺

2. PBr₃, KCN, H₂

3. KCN, H₃O⁺

4. HCN, PBr₃, H₃O⁺

$\stackrel{{\mathrm{H}}^{+}/∆}{\to }A\left(major\right)$

The product ‘A’ is