Topic: Aldehydes, Ketones and Carboxylic Acids, Test No.: 02, Total MCQs: 15
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Question 1 |
Acetone is treated with excess of ethanol in the presence of hydrochloric acid. The product obtained is: [CBSE AIPMT 2012]
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Question 2 |
H2 and Pt as catalyst | |
Glycol with KOH | |
Zn-Hg with HCl | |
LiAlH4 |
Question 3 |
Identify the product in the reaction
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[DELHI PMT 2010]
PhCH2CH2CHO | |
PhCOCH2CH3 | |
PhCH2COCH3 | |
PhCOCOMe |
Question 4 |
Which of the following statements is not correct? [DELHI PMT 2010]
Aldehydes and ketones undergo nucleophilic addition | |
Aldehydes and ketones undergo electrophilic substitution | |
Aldehydes and ketones contain polar carbonyl group | |
Lower members of aldehydes and ketones are soluble in water due to hydrogen bonding |
Question 5 |
Compound 'A' undergoes formation of cyanohydrins which on hydrolysis gives lactic acid (CH3CHOHCOOH). Therefore, compound 'A' is [DELHI PMT 2010]
formaldehyde | |
acetaldehyde | |
acetone | |
benzaldehyde |
Question 6 |
Trichloroacetaldehyde, CCl3 CHO reacts with chlorobenzene in the presence of sulphuric acid and produces [CBSE AIPMT 2009]
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Question 7 |
The compound which forms acetaldehyde when heated with dilute NaOH is [Karnataka CET 2009]
1 chloro ethane | |
1, 1 dichloro ethane | |
1, 2 dichloro ethane | |
1, 1, 1 trichloro ethane |
Question 8 |
An organic compound X is oxidized by using acidified K2Cr2O7. The product obtained reacts with phenyl hydrazine but does not answer silver mirror test. The possible structure of X is [Karnataka CET 2009]
(CH3)2CHOH | |
CH3CHO | |
CH3CH2OH | |
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Question 9 |
For making distinction between 2-pentanone and 3-pentanone the reagent to be employed is [WB JEE 2009]
K2Cr2O7/H2SO4 | |
Zn-Hg/HCl | |
SeO2 | |
Iodine/NaOH |
Question 10 |
In which of the following reactions new carbon-carbon bond is not formed [WB JEE 2009]
Cannizzaro reaction | |
Wurth reaction | |
Aldol condensation | |
Friedel-Crafts reaction |
Question 11 |
A strong base can abstract an a-hydrogen from [CBSE AIPMT 2008]
Amine | |
Alkane | |
Alkene | |
Ketone |
Question 12 |
Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called [CBSE AIPMT 2007]
Cope reduction | |
Dow reduction | |
Wolff-Kishner reduction | |
Clemmensen reduction |
Question 13 |
The product formed in Aldol condensation is [CBSE AIPMT 2007]
a beta-hydroxy aldehyde or a beta-hydroxy ketone. | |
an alpha-hydroxy aldehyde or ketone. | |
an alpha, beta unsaturated ester | |
a beta-hydroxy acid |
Question 14 |
The incorrect IUPAC name is [CBSE AIPMT 2001]
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Question 15 |
The appropriate reagent for the transformation: [IIT JEE 2000]
Zn (Hg), HCl | |
NH2NH2, OH- | |
H2, Ni | |
NaBH4
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plz explain ans to question no 6,7,15
Hey!Can explain you question no. 15. Others i too dont know. In 15 there is a slight misprint actually its a ketone c=o there, which can be converted to alkane on treatment with NH2-NH2, KOH which is called wolff kischner reduction. You might have studies this under the prepartion of alkanes using carbonyl compounds. We arent using clemmensen(Zn-Hg, amalgam) here cuz then it will replace the OH with Cl. NaBH4 will convert ketone to alcohol. H2,Pt wont give this reaction, it also coverts ketone to alcohol. Hence the answer is option B. Hope it helped you. Cheers!! 😀
Q.no 6 —-> thats formation of D.D.T from chlorobenzene+Ccl3CHo
good one !!
Ketones do not undergo nucleophillic reactions due to steric and electronic reasons
Hence the ans provided i wrong!