1000 multi choice question organic chemistry

Multiple-Choice Questions in Organic Chemistry Multiple choice questions usually include a phrase or stem followed by three tofive options/choices... This unit includes 1000 multiple ch

Multiple-Choice Questions in Organic Chemistry

Multiple choice questions usually include a phrase or stem followed by three tofive options/choices

This unit includes 1000 multiple choice questions The purpose is to assess thebreadth of student’s knowledge and understanding of the basic concepts oforganic chemistry Remember that the multiple choice questions :

(a)

122 A and B are stereoisomers They are nonsuperimposable and are mirror

images of one another Which of the following best describes the relationshipbetween A and B?

181 Gasoline with an octane number of 90 is equivalent in knocking

characteristics to a mixture of heptane and isooctane of the followingcomposition :

Answer (d)

204 In the reaction of CH3CH2CH=CH2 with HCl, the H of the HCl will becomeattached to which carbon?

244 Which of the following statements are correct concerning delocalized

(c) The rate of reaction of a particular alkyl bromide depends on the steric

(b) C–H

(c) C–O

472 Which action best accounts for the solubility of aldehydes and ketones in

(d) an ether

Answer (a)

505 An unknown compound gave a positive Tollens' test Treatment of the

unknown with I2/NaOH gave a solid which was identified as iodoform Theunknown was?

520 When carboxylic acids and dicarboxylic acids have similar molecular

542 CH3(CH2)4 is the sodium salt of hexanoic acid The watersolubility of this salt is :

553 A compound undergoes reduction with LiAlH4 It also dissolves in aqueousNaOH from which it can be recovered by addition of HCl The compound is

(c) the presence of CH3 group sterically hinders the protonation of the NH2

Answer (c) Amides are the most stable of the carboxylic acid derivatives

Answer (b) Amines are fairly polar, but they boil at temperatures lower than

those of alcohols of similar chain length and structure Amines do have higherboiling points than alkanes because they possess H-bond donors and acceptors

677 Which of the following organic ions results when glycine is treated with

(a) Amylose is a branched polysaccharide while amylopectin is a

Answer (d) The numbering is done to produce the smallest total Therefore,

number from the ethyl group toward the nitro group List the substituents inalphabetic order

formula CH (A) is resistant to attack by oxidizing agents but undergoes

substitution and addition reactions X-ray analysis shows that the distancebetween adjacent carbon atoms is 1.39Å (intermediate between single and

(d) donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

(a) the carbonium ion intermediate has a negative charge on the meta position (b) the more stable resonance hybrid occurs with meta attachment of the

the positive charge on the carbon bearing the electron-withdrawing group

(highly unstable) This resonance form does not occur with meta placement of

847 An organic compound (A) was heated with a solution of NaOH The

resulting solution was cooled, acidified with dilute HNO3, and then AgNO3

solution was added This gave a white precipitate The compound (A) may be (a)

Answer (d) Of the aromatic amines, the weakest base is the one with the

electron-withdrawing substituent: (4) is the weakest followed by aniline (3).Compound (2) is the strongest base because its electrons are not delocalized

879 Which of the following reagents is used to prepare benzenediazonium

(d) (2) > (1) > (3)

Answer (a) Hydroxyl groups can more easily form intramolecular H-bonds in

the ortho position than in the meta or para positions These intramolecular

H-bonds decrease boiling point Therefore, compound (3) has a higher boilingpoint than compound (2) Compound (2), with two hydroxyl groups, has a stillhigher boiling point than phenol

936 Benzoic acid and diphenyl ketone are both solids insoluble in water A

946 The order of increasing acidity is :

(d) All of these

958 Naphthalene undergoes reduction with H2 in the presence of Ni catalyst athigh temperature and pressure to give

980 How many isoprene units are in a sesquiterpene?