Explanation
It undergoes electrophilic substitution at m-position and also gives iodoformtest. Thus option (c) is correct.
Wolff-kishner reduction does not convert >CO to > CHOH but converts itto >CH2.
Tollen’s reagent is not used in the detection of unsaturation but is used fordistinction of (i) aldehydes from ketones (ii) terminal alkynes from non-terminal alkynes
Acetophenone being a ketone does not react with Tollen’s reagent to give silvermirror
Acetone forms sodium bisulphite adduct but acetophenone does not.
The electron-withdrawing nitro group facilitates the release of hydride ion.Hence option (d) is correct.
Both Zn (Hg ) HCl and NH2NH2OH− can reduce COCH3 to CH2CH3 group but.HCl will also bring about the dehydration of alcohol to form an alkene.Therefore, the most effective reagent is NH2NH2.OH−.
Pinacol-Pinacolone rearrangement.
Since a keto group is more electron-withdrawing than an ester group,therefore, the H-atoms of the CH2 group flanked by two keto groups inpentane 2, 4-dione is the most acidic. Thus, option (a) is correct
Acid character decreases as the + I-effect of the alkyl group increases from
CH3 → CH3CH2 → CH3CH2CH2 i.e. (i) > (ii) > (iii) > (iv)
-I-Effect of the Cl atom decreases with distance. Therefore, CH2ClCOOH is the strongest acid.
Under strong acidic conditions present in stomach (pH 2-3), weak acids such as acetylsalicylic acid with pKa =3.5 remains unionized but under basic conditions (pH 8) present in small intestine, it is ionized. Thus option (d) is correct.
Acetic acid does not reduce Fehling’s solution while all others i.e formicacid, formaldehyde and acetaldehyde do.
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