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1.

Choose the Gattermann-Koch reaction.A. B. C. D. None of the above

Answer» Correct Answer - A
Discussion
2.

Consider the following Rosenmund reaction, `RCOCl + H_(2) overset(Pd//BaSO_(4))rarrRCHO + HCl` Here, `BaSO_(4)`A. promotes catalytic activity of PdB. removes the HCl formed in the reactionC. deactivates palladiumD. activates palladium

Answer» Correct Answer - C
`BaSO_(4)` decreases the activity of Pd.
Discussion
3.

The Clemmensen reduction of ketones is carried out in the presence ofA. `Zn-Hg` with `HCl`B. `LiAlH_(4)`C. `H_(2)` and `Pt` as a catalystD. glycol with KOH

Answer» Correct Answer - A
The reagents used to carry out Clemmensen reduction of ketones are `Zn-Hg` with conc. HCl.
Discussion
4.

Which of the following ketones will not respond to iodoform test?A. Methyl isopropyl ketoneB. Ethyl isopropl ketoneC. Dimethyl ketoneD. 2-hexanone

Answer» Correct Answer - B
Discussion
5.

In the aldol condensation of acetaldehyde and acetone in dilute alkali, the carbanion source will beA. acetaldehydeB. acetoneC. Both (a) and (b)D. None of these

Answer» Correct Answer - B
Acetone generates carbanion because carbonyl group of acetaldehyde acts as a better nucleophile acceptor than acetone.
Discussion
6.

Arrange the following compounds in the increasing order of nucleophillic addition reaction: I. `HCHO` II. `CH_(3)COCH_(3)` III. `C_(6)H_(5)COCH_(3)` IV. `C_(6)H_(5)COC_(6)H_(5)`A. `I lt II lt III lt IV`B. `IV lt III lt II lt I`C. `IV lt II lt III lt I`D. `III lt IV lt II lt I`

Answer» Correct Answer - B
Steric hinderance decreases the rate of reaction. This steric hinderance is minimum in methanal and maximum in benzophenone.
Discussion
7.

Oximino acetone is formed in the reactionA. acetone + hydroxylamineB. acetone + ammoniaC. acetone + nitrous acidD. None of the above

Answer» Correct Answer - C
`CH_(3)-underset(O)underset(||)C-CH_(3)+H-O-NOrarr`
`CH_(3)-overset(O)overset(||)C-CH=N-OH`
Discussion
8.

`CH_(3) - C -= CHoverset(40%H_(2)SO_(4))underset(1%HgSO_(4))rarrAoverset("isomerisation")rarr` Structure of A and type of isomerism in the above reaction respectively areA. prop-1-en-2-ol, metamerismB. prop-1-en-1-ol, tautomerismC. prop-2-en-2-ol, geometrical isomerismD. prop-1-en-2-ol, tautomerism

Answer» Correct Answer - D
`H_(3)C-C-=CHoverset(40%H_(2)SO_(4))underset(1%HgSO_(4))rarrH_(3)C-underset(("unstable"))underset("prop-1-en-2-ol")underset(OH)underset(|)C=CH_(2)`
`overset("Tautormerism")rarrH_(3)C-underset(O)underset(||)C-CH_(3)`
Discussion
9.

For distinct between `CH_(3)CHO` and `C_(6)H_(5)CHO`, the used regent isA. KCNB. HCNC. `NH_(2)OH`D. `PCl_(5)`

Answer» Correct Answer - A
`CH_(3)-overset(O)overset(||)C-H-overset(KCN)rarrCH_(3)-overset(overset(-)(O)overset(+)(K))overset(|)underset(CN)underset(|)C-H`
But `PH-overset(O)overset(||)C-Hoverset(KCN)rarrPh-overset(O)overset(||)C-underset(OH)underset(|)CH-Ph`
In other reactions, the products are similar.
Discussion
10.

`CH_(3)C-=C CH_(3) overset((i)X) underset((ii)H_(2)O //Zn)rarr` `X` in the above reaction isA. `HNO_(3)`B. `O_(2)`C. `O_(3)`D. `KMnO_(4)`

Answer» Correct Answer - C
`CH_(3)-C=C-CH_(3)overset(O_(3))underset(Zn//H_(2)O-H_(2)O_(2))rarr`
`CH_(3)-underset(O)underset(||)C-underset(O)underset(||)C-CH_(3)`
Discussion
11.

Identify the starting material from which the products `H_(3)C CH=underset(CH_(3))underset(|)C-CHO` and `H_(3)C-CH_(2)CH=CH-CHO` are formed ?A. Two molecules of ethanolB. Two molecules of propanalC. One molecule of ethanal and two molecules of propanalD. One molecule of propanal and one molecule of ethanal

Answer» Correct Answer - D
Discussion
12.

Select the structure or chromium complex formed when the toluene reacts with chromyl choride to give benzaldehyde on hydrolysis.A. B. C. D.

Answer» Correct Answer - C
Discussion