Choose the one alternative that best completes the statement or answer the quest
ID: 1009609 • Letter: C
Question
Choose the one alternative that best completes the statement or answer the question. Give the IUPAC name for the following compound: A) 1-chloro-5-methylcyclohexane B) 1-chloro-2-methylcyclohexane C) 1-methyl-2-chlorocyclohexane D) 1-methyl-5-chlorocyclohexane E) 1, 2-chloromethylcyclohexane 2) Which of the following is not a nucleophile? A) +CH_3 B) HC C: C) PH_3 D) CH_3O E) CH_3NH Which of the following best describes the carbon-chlorine bond of an alkyl chloride? A) polar; delta+ at carbon and delta- at chlorine B) nonpolar; no dipole C) polar; delta- at carbon and delta+ at chlorine D) ionic E) none of the above The major type of reactions that alkanes undergo is: A) free radical addition reactions. B) nucleophilic substitution reactions. C) electrophilic addition reactions. D) electrophilic substitution reactions. E) free radical substitution reactions.Explanation / Answer
1. The IUPAC name of the compound will be 1-chloro-2-methylcyclohexane.
There are 2 groups attached to cyclohexane, chloro and methyl. According to alphabetically arrangement of the groups, chloro should get 1st position and methyl should get 2nd position. So, answer is B.
2. For, a group to become nucleophile, it must have some electrons which can be donated. It should not be electron deificent group. Out of the given compounds, CH3+ is a positively charged moiety, so it is electron deficient. All the other compounds either have -ve charge or has lone pair to donate, So, they will act as nucleophile. Answer is A.
3. Alkyl chloride is a polar bond because of the difference in electronegativity of C and Cl. But Cl is more electronegative than C. So, C will have delta positive charge and Cl will have delta negative charge. Answer is A.
4. Alkanes undergo mostly free radical substitution reactions. It can not undergo addition reaction, because double or triple bonds, which alkanes do not have, undergo addition reactions. It undergo substitution reactions because H is substituted by any other group. Answer is E.