Explore topic-wise InterviewSolutions in Current Affairs.

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1.

`CH_(3)-CH_(2)CH_(2)CH_(2)-CH_(3)overset(CH_(2)N_(2)//Delta)rarr`Product Which of the following product(s)is/are can be abtained in the above reaction.A. IsopentaneB. 3-Methyl hexaneC. n-pentaneD. 3-Methyl pentane

Answer» Correct Answer - D
(d) Insertion reaction.
Discussion
2.

Wolff rearrangement /,brgt When a-Diazoketones are photo -irradiated or heated at high temperature or reacted with silver oxide or silver salts at room temperature, they losse nitrogen and rearrange to form ketene. The ketenes reacts rapidly with water, alcohol and amines. Therefore, the reactions called Wolff-rearrangment. `Ph-underset(14)overset(O)overset(||)C-CHN_(2)underset(H_(2)O)overset(CH_(3)OH)rarr(A)`, Product (A) is :A. `Ph-overset(14)CH_(2)-Co_(2)H`B. `Ph-CH_(2)-overset(14)Co_(2)H`C. `Ph-overset(14)Co_(2)H`D. `Ph-Co_(2)H`

Answer» Correct Answer - B
Intramolcular rearrgent
Discussion
3.

Cosider the given reaction for preparation of alkyne. (Fritsch reaction). Anti group will migrate because of less steric hindrance. Rate of reaction when the halide ion :A. `I^(Θ)gtCl^(Θ)gtBr^(Θ)gtF^(Θ)`B. `I^(Θ)gtBr^(Θ)gtCl^(Θ)gtF^(Θ)`C. `F^(Θ)gtCl^(Θ)gtBr^(Θ)gtI^(Θ)`D. `F^(Θ)gtBr^(Θ)gtCl^(Θ)gtI^(Θ)`

Answer» Correct Answer - B
Good leaving group
Discussion
4.

Given is mechanism of Beakmann rearrangement. Which of the following reagent cannot used in Beckmann rearrangement ?A. TsOHB. `R-DO_(2)Cl`C. `BF_(3)`D. Ph - Li

Answer» Correct Answer - D
Consider Lewis acid.
Discussion
5.

When primary amine reacts with chloroform in ethanolic KOH, then product is :A. an isocyanideB. an aldehydeC. a cyanideD. an alcohol

Answer» Correct Answer - A
(a) Iso-cyanide test
Discussion
6.

Product X will be :A. B. C. D.

Answer» Correct Answer - B
(b) Halofrom reaction.
Discussion
7.

Product (A) is :A. B. C. D.

Answer» Correct Answer - C
(c ) Amine formation followed by Halofrom reaction
Discussion
8.

Product (A) is :A. B. C. D.

Answer» Correct Answer - A
Discussion
9.

The orbital picture of a triplet carbene can be drown as :A. B. C. D. None of these

Answer» Correct Answer - C
(c ) Multiplicity `rArr 2s+1rArr2(1)+1=3rArr`triplet
Discussion
10.

Product (A) will be :A. B. C. D.

Answer» Correct Answer - B
(b) Simmon smith reaction
Discussion
11.

The major product formed in the folowing reaction is A. B. C. 50 : 50 mixture of above two compoundsD.

Answer» Correct Answer - A
(a) It is stereospecific reaction
Discussion
12.

Product (A) of the reaction is :A. B. C. D.

Answer» Correct Answer - C
(c ) Helofrom reaction.
Discussion
13.

Which of the following will not give Hoffmann bromaminde reaction ?A. `CH_(3)-overset(O)overset(||)C-NH_(2)`B. `Ph-overset(O)overset(||)C-NH_(2)`C. `CH_(3)-overset(O)overset(||)C-NH-Br`D. `Ph-overset(O)overset(||)C-NH-Ph`

Answer» Correct Answer - D
(d) `Ph-overset(O)overset(||)C-NH-Ph`
N-substituted amide will not undergo Hoffmann bromamide reaction because formation of iso-cyanate is not possible
Discussion
14.

Select the reagent for above conversion.A. `CH_(2)N_(2)//Delta`B. `CBr_(4)//R Li`C. `H_(2)C=CH_(2)`D. t-BuOK

Answer» Correct Answer - A
(a)Carbene formation
Discussion
15.

Product (A) & (B)n respectively in the above reaction are :A. `Ph-overset(O)overset(||)C-NH-CH_(3),Ph-overset(O)overset(||)C-NH-CH_(3)`B. `CH_(3)-overset(O)overset(||)C-NH-Ph,CH_(3)-overset(O)overset(||)C-NH-Ph`C. `Ph-overset(O)overset(||)C-NH-CH_(3),CH_(3)-overset(O)overset(||)C-NH-Ph`D. `CH_(3)-overset(O)overset(||)C-NH-Ph,Ph-overset(O)overset(||)C-NH-CH_(3)`

Answer» Correct Answer - C
(c ) Anti-group migrate in Backmann rearrangement.
In reaction (1) `-CH_(3)` migrate , In reaction (2) -Ph migrate
Discussion
16.

Hoffmann bromamide reaction involves conversion of a carboxylic acid amide into an amine with a loss of a carbon atom on treatment with aqueous sodium hypobromite. Thus Hoffmann result in shortening of a carbon chain. `R=overset(O)overset(||)C-NH_(2)underset(NaOH)overset(Br_(2))rarrR-NH_(2)+NaBr+Na_(2)CO_(3)` Mechanism of the reaction is : Number of moles of NaOh consumed in above reaction.A. 1B. 2C. 3D. 4

Answer» Correct Answer - D
`RCONH_(2)+Br_(2)+4NaOHrarrRNH_(2)`
Discussion
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