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251.

According to the huckel rule, planar and completely conjugated monocyclic polyene is aromatic if it possessesA. `(4n+1)pi" electrons"`B. `(4n+2)pi" electrons"`C. `(2n+2)pi" electrons"`D. `4npi" electrons"`

Answer» Correct Answer - b
Discussion
252.

(A) Cyclopentadienyl anion is aromatic. ( R) Aromatic molecules have high degree of themodynamic stability.A. If both (A) and ( R) are correct and ( R) is corrct explanation of (A).B. If both (A) and ( R) are correct but ( R) is not the corrct explanation of (A).C. If (A) is incorrect but ( R) is incorrect.D. If (A) is incorrect but ( R) is incorrect.

Answer» Correct Answer - b
Discussion
253.

Match the following : `{:("Column I","Column II"),("(a) Aromatic","(p) Planar"),("(b) Antiaromatic", "(q) (4n+2)"pi"delocalize electros"),("(c) Cyelooctatetraene","(r) (4n)"pi" localized electrons"),("(d) Huckel rule","(s) Non-lanar"):}`

Answer» Correct Answer - `(a-p,q); (b-p,r); (c-r,s); (d-p,q)`
Discussion
254.

Among P, Q, R and S, the aromatic compounds(s) is/are A. PB. QC. RD. S

Answer» Correct Answer - `(a,b,c,d)`
Discussion
255.

Diople moment of which compound is not zero ?A. B. C. D.

Answer» Correct Answer - A::C
Discussion
256.

Dipole moment of which compound will zero ?A. B. C. D. All of these

Answer» Correct Answer - C
Discussion
257.

Which of the following is not Huckel number?A. 18B. 14C. 10D. 13

Answer» Correct Answer - 4
The Huckel numbers corresponds to `(4n+2)pi` delocalized electrons, where n equals zero or a whole number.
Discussion
258.

Which of the following hydrocarbonds has an acceptable huckel number but is not aromatic?A. [10]-annleneB. [12]-annuleneC. [14]-annleneD. [18]-annulene

Answer» Correct Answer - A
Although it has a huckel number the molecule connot adopt the essential planar conformation if all the double bonds are cis or one of the double bonds is trans, the angle strain is excessive. The isomer with two trans double bonds cannot be flat because two of the H atoms interfere with each other.
Discussion
259.

When benzene is heated with air at `500^(@)C` in the presence of `V_(2)O_(5)` as catalyst, the major product formed isA. oxalic acidB. glyoxalC. fumaric acidD. maleic anhydride

Answer» Correct Answer - d
Discussion
260.

Which of the following reactions would give isopropyl benzene as the major product ? A. I and iv onlyB. ii and iii onlyC. ii iii iv onlyD. d all of these

Answer» Correct Answer - d
Discussion
261.

Isopropyl benzene can be obtained by :A. B. C. D.

Answer» Correct Answer - A::B::C
Discussion
262.

Product B of reaction is :A. B. C. D.

Answer» Correct Answer - B
Discussion
263.

Arrage the following group in order of decreasing electron attracting capacity :A. `NO_(2) gt COOH gt Cl gt OH`B. `Clgt OH gt NO_(2) gt COOH`C. `OHgt Clgt NO_(2) gt COOH`D. `NO_(2) gt COOH gt OH gt Cl`

Answer» Correct Answer - A
Discussion
264.

Arrage the following in decreasing order of reaction with `Cl_(2)//AlCl_(3)`: A. QgtRgtPB. PgtQgtRC. RgtQgtPD. RgtPgtQ

Answer» Correct Answer - C
Discussion
265.

Arrage the following group in order of decreasing o-and p-directing strenght `- overset()NH_(2), - Cl,-underset(..)overset()OH, - R`A. `- Cl gt underset(..)overset(..)OH gt-Rgt- NH_(2)`B. `- overset(..)NH_(2) gt - R gt - Clgt - underset (..) overset(..)OH`C. `- overset(..)NH_(2) gt - OH gt - Clgt - underset (..) overset(..)R`D. `- overset(..)NH_(2) gt - OH gt - Rgt - underset (..) overset(..)Cl`

Answer» Correct Answer - D
Discussion