Which of the following will give yellow precipitate with I₂/NaOH?

1.	CH3-CO-O-CO-CH3	2.
3.		4.	Both (2) and (3)

Identify (X) in the sequence :

${\mathrm{C}}_3{\mathrm{H}}_8\mathrm{O} \left(\mathrm{X}\right) \underset{{\mathrm{H}}_2{\mathrm{SO}}_4}{\overset{{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7}{\to }} {\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O} \underset{\mathrm{Warm}}{\overset{{\mathrm{I}}_2 +\hspace{0.17em}\mathrm{NaOH}}{\to }} {\mathrm{CHI}}_3$

1. CH₃-CH₂-CH₂OH

2. ${\mathrm{CH}}_3-\mathrm{CH}-{\mathrm{CH}}_3$
$|$
$\mathrm{OH}$

3. CH₃-O-CH₂-CH₃

4. CH₃-CH₂-CHO

An organic compound X on treatment with acidified K₂Cr₂O₇, gives compound Y which reacts with I₂, and NaOH to form CHI₃. The compound X can be-

1. CH₃OH

2. CH₃CHO 

3. CH₃COCH₃

4. CH₃CH(OH)CH₃

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis?

1.		2.
3.

CH₃CH=CHCHO is oxidized to CH₃CH=CHCOOH using-

1. Alkaline permanganate

2. Ammoniacal silver nitrate

3. Selenium dioxide

4. Osmium tetraoxide

Ozonolysis of propyne gives:

1. CH₃CHO               

2. CH₃COCHO

3. HCHO                   

4. CHOCHO

Propyne on oxidation with SeO₂ gives:

(1) CHOCHO                   

(2) CH₃CH₂CHO

(3) CH₃COCHO               

(4) CHOCH₂CHO

Acetylene and HCHO react in presence of copper acetylide catalyst to form:

(1) 2-butyne-1,4-diol

(2) 1-butyne-1,4-diol

(3) 2-butyne-1,2-diol

(4) none of these

An organic compound X having molecular formula C₅H₁₀O yields phenyl hydrazone and

gives negative response to the iodoform test and Tollen's test. It produces n-pentane on

reduction. X could be

1. pentenal

2. 2-pentanone

3. 3-pentanone

4. n-amyl alcohol

CH₃CHO and C₆H₅CH₂CHO can be distinguished chemically by

1. Benedict test

2. iodoform test

3. tollen's reagent test

4. Fehling solution test