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51.

can be differentiated byA. Carbylamine reactionB. Iodoform testC. cold `KMnO_(4)`D. `Br_(2)-H_(2)O`

Answer» Correct Answer - A
`1^(@)` and `2^(@)` amine can be differented by Carbylamine test .
Discussion
52.

An alkyne ob ozonolysis produces `2,3`-Butanedione. What is its possible structure?

Answer» Correct Answer - N//A
Alkyne is But-`2`- yne.
`underset("But-2-yne")(CH_(3)-C-=C-CH_(3))overset(Ozonolysis)rarrCH_(3)-overset(O)overset(||)(C )-overset(O)overset(||)(C )-CH_(3)`
Discussion
53.

On ozonolysis, an organic compound (A) `C_(6)H_(10)` gives two aldehyde (B) `C_(2)H_(4)O` and (C ) `C_(2)H_(2)O_(2)`. Determine the structure of `A, B` and `C`.

Answer» Correct Answer - N//A
(1) `(A), C_(6)H_(10)` either has one triple bond or two double bonds.
(2) Ozonolysis of `(A)` suggests that it has two double bonds.
`underset((A))(C_(6)H_(10))overset("Ozonolysis")rarr underset((B))(C_(2)H_(4)O)+underset((C ))(C_(2)H_(2)O_(2))`
Since, `(B)` and `(C )` are aldehydes, i.e., `CH_(3)CHO` and `underset("Ethanol(B)")(CH_(3)CHO)` and `underset("Ethane-1,2-dial (C )")(CHO.CHO)`
`:. (A)` is " " `underset("Hexa-2,4-diene")(CH_(3)CH=CH-CH=CHCH_(3))`
Discussion
54.

On catalytic hydorgenation how many isomeric alkene will give `2`-Methyl butane.

Answer» Correct Answer - `3`
`CH_(3)-underset(CH_(2))underset(||)(C )-CH_(2)-CH_(3), CH_(3)-underset(CH_(3))underset(|)(C )-CH-CH_(3), underset(CH_(3))underset(|)(CH )-CH=CH_(2)`
Discussion
55.

Distinguish between`1-` Propanol and `2`-Methyl-`2`-Methyl-`2`-propanol by suitable chemical test.

Answer» Correct Answer - N//A
Lucas reagent: Cloudiness appears immidiately with `2`-methyl-`2`-propanol `(3^(@) "alcohol")` while `1`- propanol `(1^(@) "alcohol")` will not react with Lucss reagent appreciably at room temp.
Discussion
56.

Glycerol is purified by:A. Steam distillationB. vaccume distillation under pressureC. fractional distillationD. Simple distillation.

Answer» Correct Answer - B
Because glycerine decomposes at its boiling point
Discussion
57.

A research scholar get a mixture of three product during an experiment with ammonia. In product I only one H of ammonia is replaced by ethyl group and in II two H atoms of ammonia are replaced by ethyl groups and in III all the H- atoms are replaced by ethyl groups. Which test he should use to distinguish or separate the products `:`A. Carbyl amine testB. Iodoform testC. Fehling solution testD. Hinsbert test

Answer» Correct Answer - D
`1^(@),2^(@)` and `3^(@)` amine mixture can be separated by Hinsberg reagent.
Discussion
58.

Which is incorrect match with respect to the reagent used for lab test ?A. carbohydrate ` to alpha`-Naphthol (molish reagent)B. Nitro ethane `to Zn,NH_(4)Cl` and `AgNO_(3)` (Mulliken Barker test)C. Phenol `to` Anhydrous `ZnCl_(2)`+Conc. HCl (Lucus reagent)D. Benzoic acid `to NaHCO_(3)`

Answer» Correct Answer - C
Phenol does not gives Lucas reagent test.
Discussion
59.

Identify the structure of amine.

Answer» Correct Answer - `CH_(3)-overset(CH_(3))overset(|)(N)-CH_(3) (3^(@) "Amine")`
Discussion
60.

When Lassiange extract of Methylamine react with `FeSO_(4)//"dilute" H_(2)SO_(4)` what happened ?

Answer» Correct Answer - Prussian blue colour will appear.
Discussion