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CBSE Class 12-science Answered

why is sulphur and quinone used in rosenmund reaction?
Asked by Mahak | 28 Sep, 2013, 11:38: AM
answered-by-expert Expert Answer
Sulfur is used to prevent the subsequent hydrogenation of the aldehyde in the Rosenmund reaction.
Answered by | 29 Sep, 2013, 08:33: AM

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CBSE 12-science - Chemistry
C-C=C-CHO ka iupac name
Asked by ukg8612 | 15 Apr, 2024, 07:36: PM
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CBSE 12-science - Chemistry
identify the product when ch3ch=ch-ch2-ch2-c=o-ch3 reacts with following reagents ( a) lialh4/d2o (b) nabh4 (c) c2h5mgbr
Asked by ajayarchi | 08 Feb, 2024, 03:43: AM
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CBSE 12-science - Chemistry
explain the following named reaction aldol condensation
Asked by pallasriramulu9 | 24 Dec, 2023, 06:05: AM
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CBSE 12-science - Chemistry
Define antibiotics and Antacids
Asked by bsaheliya | 22 Dec, 2023, 09:53: PM
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CBSE 12-science - Chemistry
give reason why trichloro acetic acid has more acidic character than monochloro acid
Asked by ygarg8323 | 18 Apr, 2022, 12:47: PM
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CBSE 12-science - Chemistry
sir/madam,   1. in NCERT chemistry books in organic chemistry sometimes hydrolysis rxn takes places by acid and water(H2SO4 + H2O/ H3O+/H+ + H2)), base with water(NaOH + H2O/ KOH + H2O) and other times only with water(H2O) what is the difference between the three and when do we use them in rxns ? hydrolysis means breaking or cleavage of compounds using water.... am I right?  2. Is Aldol rxn and condensation only limited to 2 molecules of same aldehyde compound and 2 molecules of same ketone compound? then does it mean that it undergoes self condensation? And cross Aldol rxn and condensation is carried out by two different molecules of aldehydes and two different molecules of ketones. is cross Aldol rxn and condensation also carried out between one aldehyde and one ketone molecules? request u to plz answer all questions
Asked by kaziryan.05 | 30 Jun, 2021, 04:52: PM
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CBSE 12-science - Chemistry
sir/madam,  in NCERT chemistry books in organic chemistry sometimes hydrolysis rxn takes places by acid and water(H2SO4 + H2O/ H3O+/H+ + H2)), base with water(NaOH + H2O/ KOH + H2O) and other times only with water(H2O) what is the difference between the three and when do we use them in rxns ? hydrolysis means breaking or cleavage of compounds using water.... am I right? request u to answer all questions pls
Asked by kaziryan.05 | 29 Jun, 2021, 08:36: AM
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CBSE 12-science - Chemistry
sir/madam, is KMnO4-KOH the chemical formula for alkaline potassium permanganate? like in the NCERT if alkylbenzene is reacted with chromic acid (H2CrO4), will there be any intermediate product just like alkylbenzene when reacted with KMnO4-KOH gives potassium salt of carboxylic acid which then further oxidises to carboxylic acid? also is my formula correct for chromic acid and alkaline potassium permanganate? pls requested to respond to all my questions
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Asked by kaziryan.05 | 28 Jun, 2021, 02:34: PM
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CBSE 12-science - Chemistry
carbolic acid
Asked by saimerala007 | 22 May, 2021, 02:08: PM
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CBSE 12-science - Chemistry
IUPAC name 
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Asked by amitkumar.cis | 31 Dec, 2020, 10:45: AM
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