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251.

The energy difference between the chair and the boat conformations of cyclohexane isA. `44 kJ mol^(-1)`B. `24 kJ mol^(-1)`C. `34 kJ mol^(-1)`D. `68 kJ mol^(-1)`

Answer» Correct Answer - A
44 kJ/mol.
Discussion
252.

Racemic mixture is formed ny mixing two:A. Isomeric compoundsB. Chiral compoundsC. meso compoundsD. enantiomers with chiral carbon

Answer» Correct Answer - D
Racemic mixture is an equimolar mixture of enantiomers with chiral carbons or an equimolar with chiral carbon or an equimolar mixture to two i.e., dextro and laborotatory optical isomers is known as racemic mixture.
Discussion
253.

In given sequence of reaction predict X `X overset(KOH)underset(H_(2)O)rarr Y overset(Al_(2)O_(3))underset(633 K)rarr Z overset([O])rarr2` moles of `CH_(3)COOH`A. `CH_(3)CH_(2)CH(I)CH_(3)`B. `CH_(3)CH_(2)CH_(2)CH_(2)I`C. `CH_(3)CH(I)CH(I)CH_(3)`D. `CH_(3)CH(I)CH_(2)CH_(2)I`

Answer» Correct Answer - A
`H_(3)C-CH_(2)-underset((X))underset(I)underset(|)(C )H-CH_(3)overset(KOH)underset(H_(2)O)rarr`
`H_(3)C-CH_(2)-underset((Y))underset(OH)underset(|)(C )H-CH_(3)overset(-H_(3)O)underset(Al_(2)O//633 K)rarr`
`H_(3)C-CH(Z)CH-CH_(3) overset(KMnO_(4)//H_(2)SO_(4))underset(Delta)rarr 2CH_(3)COOH`
Discussion
254.

The set of compounds in which the reactivity of halogen atom in the ascending order is .A. Vinyl chloride ,chloroethane, chlorobenzene.B. Vinyl chloride, chlorobenzene,chloroethane,C. Chloroethane ,chlorobenzene, vinyl chlorideD. Chlorobenzene, vinyl chloride, chloroethane

Answer» Correct Answer - D
Discussion
255.

The set of compounds in which the reactivity of halogen atom in the ascending order is .A. chlorobenzene, vinyl chloride, chloroethaneB. chloroethane, chlorobenzene, vinyl chlorideC. vinyl chloride, chlorobenzene, chloroethaneD. vinyl chloride, chloroethane, chlorobenzene

Answer» Correct Answer - A
Chlorobenzene lt vinyl chloride lt chloroethane.
Discussion
256.

The rate of dehydrohalogenation is more for the alkyl halideA. `CH_(3)CH_(2)CH_(2)CH_(2)Cl`B. `CH_(3)CH_(2)-overset(Cl)overset(|)(C )H-CH_(3)`C. `CH_(3)-underset(CH_(3))underset("| ")("C ")H-overset(Cl)overset(|)(C )H-Cl_(3)`D. `CH_(3)-underset(CH_(3))underset("| ")("C ")H-overset(Cl)overset(|)underset(CH_(3))underset("| ")("C ")-CH_(3)`

Answer» Correct Answer - D
Alkene formed is very stable due to hyperconjugation.
Discussion
257.

In Wurtz reaction alkyl halide react withA. Sodium in etherB. Sodium in dry etherC. Sodium onlyD. Alkyl halide in ether

Answer» Correct Answer - B
Alkyl halides give alkane when react with sodium in ether This is called Wurtz reaction
`R-CI+2Na+R-CIoverset(ether)rarrRunderset(alkan e)( -R+2NaCI)` .
Discussion
258.

The corrent order of `S_(N)2//E_(2)` ratio for the % yield of product of the following halide is (P) `CH_(3)-CH_(2)-underset(I)underset(|)overset(Ph)overset(|)C -CH_(3)` (Q) `CH_(3)-underset(Ph)underset(|)CH-underset(I)underset(|)CH -CH_(3)` (R) `CH_(3) -CH_(2) -I` (S) `CH_(3)CH_(2)-underset(I)underset(|)CH -CH_(3)` .A. `RgtSgtQgtP`B. `RgtQgtSgtP`C. `PgtRgtSgtQ`D. `QgtPgtRgtS`

Answer» Correct Answer - A
Rate of `SN_(2)` reaction `1^(@)gt 2^(@) gt3^(@)` as Beta- branching increases
steric crowding increases in transition state so it makes less stable transition state .
Discussion
259.

`C CI_(4)` cannot give precipitate with `AgNO_(3)` due to.A. Formation of complex with `AgNO_(3)`B. Evolution of `CI_(2)` gasC. Chloride ion is not formedD. `AgNO_(3)` does not give silver ion .

Answer» Correct Answer - C
`C CI_(4)` is a covalent compound Hence it does not give Cibarion in solution
`C CI_(4) +AgNO_(3)rarr` No reaction .
Discussion
260.

Which of the following compounds will make precipitate most readily with `AGNO_(3)` ?A. `C CI_(3)CHO`B. `CHCI_(3)`C. `C_(6)H_(5)CH_(2)CI`D. `CKI_(3)`

Answer» Correct Answer - D
`CKI_(3)` gives a yellow ppt of AgI.
Discussion
261.

Which of the following compounds can be hydrolysed very readily ?A. `Cl-CH_(2)-CH=CH_(2)`B. C. D. `Cl-CH=CH_(2)`

Answer» Correct Answer - A
(A) can be hydrolysed very readily because of the resonance stabilisation of allyl carbocation. `overset(+)(C )H_(2)-CH=CH_(2)harr CH_(2)=CH-CH_(2)^(+)`
Discussion
262.

The IUPAC name of alyl chloride isA. 1-ChloroethaneB. 3-Chloro-1-propyneC. 3-Chloro-1-propeneD. 1-Chloroprepene

Answer» Correct Answer - C
`underset("3-Chloroprop-1-ene")(Cl-CH_(2)-CH=CH_(2))`
Discussion
263.

Which of the following is a primary halide ?A. Isopropyl iodineB. sec-Butyl iodineC. tert-Butyl bromideD. Nehexyl chloride

Answer» Correct Answer - D
`underset("Neohexyl chloride ")(H_(3)C-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")=CH_(2)-overset(1^(@))(C )H_(2)-Cl)`
Discussion
264.

When primary aminereacts with chloroform in ehthanolic `KOH` then the product is .A. As isocyanideB. An aldehydeC. A cyanideD. An alcohol

Answer» Correct Answer - A
`CHCI_(3)+RNH_(2) +3KOHrarr RNC + 3KCI + 3H_(2)O` .
Discussion
265.

Vinyl acetylene `+HCl rarr X`. Here, X is :A. ChloropreneB. Acetylene dichlorideC. CrotonyleneD. Crotomic acid

Answer» Correct Answer - A
`CH_(2)=CH-C-=CH+HCl rarr CH_(2)=underset("Chloroprene")(CH-underset(Cl)underset(|)(C )=CH_(2))`
Discussion
266.

Which is the possible number of stereo isomers for the following formula ? `CH_(2)OH(CHOH)_(3)CHO`A. 4B. 8C. 12D. 16

Answer» Correct Answer - B
`2^(3)=8`
Discussion
267.

In a `S_(N)2` substitution reaction of the type `R-Br+Cl^(-) overset("DMF")toR-Cl+Br^(+)` which one of the following has the highest relative rate?A. `CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")("C ")-CH_(2)Br`B. `CH_(3)CH_(2)Br`C. `CH_(3)CH_(2)CH_(2)Br`D. `CH_(3)-underset(CH_(3))underset("| ")("C ")HCH_(2)Br`

Answer» Correct Answer - B
Rate of `S_(N^(2))` reactions are influenced by steraric hindrance, therefore it reacts at the fastest rate.
Discussion
268.

The `CI - C - CI` angle in `1, 1, 2, 2`, tetrachloroethone and tetrachloromethane respectively will be about:A. `120^(@)` and `109^(@).5^(@)`B. `90^(@)` and `109^(@).5^(@)`C. `109.5^(@)` and `90^(@)`D. `109^(@).5` and 120

Answer» Correct Answer - A
`underset(("Bond angle" ~= 120^(@)))underset("1, 1, 2, 2-Tetrachloroethane")(Cl-overset(Cl)overset(|)(C )=overset(Cl)overset(|)(C )-Cl) " " underset(("Bond angle" ~= 109.5^(@)))underset("Tetrachloromethane")(Cl-overset(Cl)overset(|)underset(Cl)underset(|)(C )-Cl)`
Discussion
269.

Steam distillation is based on the fact that vaporisation of organic liquid takes place atA. a lower temperature than its boiling pointB. a higher temperature that its boiling pointC. its boiling pointD. water and organic liquid both undergo distillations

Answer» Correct Answer - A
`CH_(3)C-=C-CH_(3) overset((i)X)underset((ii)H_(2)O //Zn)rarr CH_(3)-underset(O)underset("||")(C )-underset(O)underset("||")(C )-CH_(3)` X in the above reaction is
Discussion