CH_3CH=CHCH_2CH_3 is A. pentane. B. pentyne. C. 2-pentene. D. 3-pentene. C_2H_6

Question

CH_3CH=CHCH_2CH_3 is A. pentane. B. pentyne. C. 2-pentene. D. 3-pentene. C_2H_6 is A. propane. B. ethane. C. butane. D. methane. Which of the following has the greatest number of isomers? A. CH_4 B. C_2H_6 C. C_3H_8 D. C_4H_10 Select the correct name for the following compound? A. 3, 4-diethyl-4-methyl-2-butanol B. 2, 3-diethyl-4-pentanol C. 3, 4-diethyl-2-pentanol D. 3-ethyl-4-methyl-2-hexanol Two or more different compounds with the same molecular formula A. isomers B. isotopes C. hypermeres D. hypertopes

Explanation / Answer

Q.1: The longest carbon chain in this compound contains 5 C atoms. There is a double at C2 and C3. There are no other branches. Hence the IUPAC name of the compound is (C). 2-pentene (answer)

Q.2: C2H6 = C2H2x2+2 = CnH2n+2, which is the general formulae of an alkane. Hence this compound is an alkane and since this contains 2 C atoms. the iupac name is (B).Ethane

Q.3: Higher the number of C atoms, higher is the numebr of isomers. Hence (D). C4H10 has the highest number of isomers.

Q.4: The longest chain must have to be selected in a manner such that it would contian highest number of side chains. Also the number would be done in a manner such that -OH group would get the least number. Hence the iupac name is (D). 3-ethyl-4-methyl-2-hexanol. (answer)

. Q.5: Two or more different compounds with same molecular formulae are called (A). isomers

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