Part Define s-p overlapping. [When s orbital of an atom overlaps with p orbital of another atoms]
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1 Program Name B.Sc. (Chemistry) B.Sc. - Part I Paper Code CH- 02 (Organic chemistry) Section A (Very Short Answer Questions 2 Each Question Carries 2 Marks Part Define s-p overlapping. [When s orbital of an atom overlaps with p orbital of another atoms] s-p 2. Which carbocation is more stable? [Ans: tertiary] 3. Which isomerism is found in 1-propanol and 2-propanol? [Ans: Position isomerism] Give an example of geometrical isomerism. 5. Which conformation of ethane is more stable [Ans: Staggered] 6. Write the general formula of alkane and alkene. [Ans: C n H 2n+2, C n H 2n ] C n H 2n+2, C n H 2n 7. What is the order of reactivity of alkyl halide for dehydrohalogenation reaction? [Ans: Tertiary halide> Secondary halide>primary halide] 8. What will you obtain by addition of sulfuric acid on alkene? Give answer in one word Ans: Alcohol Part-2 1. Which hybridization is found in ethene? [Ans: Sp 2 ] 2. What are dextrorotatory compounds? Ans: Compounds which rotate plane polarized light clockwise. Sp 2
2 ( 3. What is racemic mixture? Ans: Mixture of dextro and laevorotatory compounds 4. Draw the Sawhorse projection formula of eclipsed conformation of n-butane. 5. Write the name of following compound. CH 2 -CH 2 -CH 2 Br Cl [Ans: 1-bromo-3-chloro propane] CH 2 -CH 2 -CH 2 Br Cl 6. Reducing agent used in Wolf Kishner reduction is..*ans: H 2 N=NH 2 ] H 2 N=NH 2 7. According to Sytzeff rule the less substituted alkene is main product. (True/False)[Ans: False] 8. Mustard gas is obtained from.(ethene/propene) [Ans: Ethene] Part-3 1. Give the hybridization of each carbon: CH 2 =CH 2 =CH 2 [Ans- Sp 2, Sp, Sp 2 ] CH 2 =CH 2 =CH 2 2. Write down the types of nitrene. [Ans: two types-a) Singlet b) triplet] 3. What is resolution? Ans: Separation of dextro and laevorotatory compounds in pure state.
3 4. Maleic acid is trans isomer. (True/false). [Ans: false] 5. Write the name of conformation of n-butane 6. What is grignard reagent. [Ans: R-Mg-X] R-Mg-X 7. Polymer of propene is.. [Ans: Polypropylene] 8. What are dienes? [Ans: Those hydrocarbons in which two carbon-carbon double bonds are presents] Part-4 1. Which carbanion is more stable? [Ans: primary] 2. Define allenes? [Ans: In which both the carbon-carbon double bonds present on same carbon atom.] 3. Give name of following compound CH=C-CH-CH-C 2 H 5 CH 3 C 2 H [Ans: 4-ethyl-3-methyl-1-hexyne ] CH=C-CH-CH-C 2 H 5 CH 3 C 2 H 5 4. How many π electrons are present in benzene ring? 5. Cyclooctatetraene is *aromatic/non aromatic] [Ans: non aromatic ] 6. Write down Wurtz Fittig reaction in one line Each carbon in benzene molecule is hybridized. [Sp 2 /Sp] [Ans: Sp 2 ]
4 8. In Sandmeyer s reaction catalyst used. (NaNH 2 : HCl/NaNO 2 :HCl) [Ans: NaNO 2 /HCl] Part-5 1. Give an example of nucleophile: [Ans: OH - ] OH - ) 2. Fumaric acid is trans isomer. (True/false) [Ans: True] 3. Give an example of functional group isomerism. 4. According to the sequence rule the order of priority of groups attached to chiral centre is: a) -C=O>-OH>C 2 H 5 >CH 3 b) -C=O>-OH>CH 3 >C 2 H 5 c) - OH>-C=O>C 2 H 5 >CH 3 d) -OH>-C=O>CH 3 >C 2 H 5 [Ans: C ] a) -C=O>-OH>C 2 H 5 >CH 3 b) -C=O>-OH>CH 3 >C 2 H 5 c) - OH>-C=O>C 2 H 5 >CH 3 d) -OH>-C=O>CH 3 >C 2 H 5 5. Which conformation of n-butane is more stable [Ans: Staggered] 6. Write the structural formula of Ziegler-Natta catalyst. [Ans: (C 2 H 5 ) Al + TiCl 4 ] 7. Write the name of following compound. H 2 C=C-C=CH 2 CH 3 [Ans: 2-methyl-1,3-butadiene] H 2 C=C-C=CH 2 CH 3
5 8. Cycloheptatriene is *aromatic/non aromatic+ [Ans: non aromatic ] Part-6 1. Free radicals are formed by heterolytic cleavage (True/False) [Ans: False] 2. The triplet carbene is Sp hybridized (True/False) [Ans: true] Sp 3. Z-isomer has highest priority groups on same side. (True/false) [Ans: True] Z - 4. Who gave the sequence rule for chiral compounds? 5. Which intermediate is formed in unimolecular elimination (E1) mechanism? [Ans: Carbocation] E1 6. Bromination of Cyclohexene in presence of CCl 4 gives Dibromocyclohexane. (cis/trans) [Ans: trans] CCl 4 7. Acetylene is formed by which kind of overlapping? [Ans: sp overlapping] 8. - What - is meta directing group? *Ans: Those substituent s, which on electrophilic substitution produce meta products as main products] Part-7 1. Which hybridization is found in free radical? [Ans: Sp 2 ] Sp 2 2. How many optically active isomers are formed in lactic acid. [ 2 n =2 1 =2]
6 2 n =2 1 =2) 3. Which conformation of cyclohexane is more stable? [Ans: Chair form] 4. What are electrophiles? [Ans: Are those species having more electron affinity] 5. Write the structural formula of 1,3-hexadiene. [Ans: CH 2 =CH 2 -CH=CH-CH 2 -CH 3 ] 1,3-6. According to Huckel s rule aromatic compounds have.. electrons. [Ans: (4n+2)π] 7. Give an example of secondary alkyl halide. (4n+2)π 8. Write down the correct order of stability among alkyl, aryl and allyl halide. [Ans: aryl >allyl >alkyl halides] Part-8 1. Write the molecular structure of D and L-glyceraldehyde. D L- 2. Write down the full form of D.D.T. 3. Gammaxene is also known as.(benzene hexa chloride/hexa chloro benzene ) [Ans: benzene hexa chloride] 4. Write name of following compound CH 3 -CH 2 -CH 2 -CH 2 [Ans: 3-bromo-1-chloro butane] Br Cl CH 3 -CH 2 -CH 2 -CH 2 Br Cl
7 5. Which catalyst used in Friedel-Craft alkylation? - Ans: Lewis acids such as-alcl 3, BF 3, AlBr 3 6. Transition state is formed in..reaction. [S N 2 /S N 1 ] [Ans: S N 2 ] 7. What is Lindlar catalyst? [Ans: Pd-BaSO 4 ] 8. What is the order of stability of all the three types of dienes? [Ans: conjugated>isolated>cumulated] Part-9 1. Trans isomer is more stable than cis isomer of alkene. (True/False) [Ans: True] 2. Write down the correct order of stabilities of free radical. 3. Cyclohexene is formed by the reaction of butadiene with.. [Ans: Ethene] 4. Which gas is used for fruit ripening? [Ans: Acetylene] 5. Cyclopentadienyl carbanion is *aromatic/non aromatic+ [Ans: aromatic ] 6. Birch reduction takes place in presence of lithium and..(liquid NH 3 / H 2 N=NH 2 ) Ans: Liquid NH 3 7. What is the order of reactivity of halogen in halogenations reaction? [Ans: F 2 > Cl 2 > Br 2 > I 2 ] 8. Chloropicrin and chloritone are formed by..(ccl 4 /CHCl 3 ) [Ans: CHCl 3 ]
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